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Статті в журналах з теми "Pregnancy and Estrus"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Syaiful, Ferry, Jaswandi Jaswandi, Mangku Mundana, Yendraliza Yendraliza, and Zaituni Udin. "Estrus response and pregnancy rate of swamp buffalo: The use of multivitamins in different estrus synchronization hormone protocols." Journal of Advanced Veterinary and Animal Research 11, no. 3 (2024): 729. http://dx.doi.org/10.5455/javar.2024.k824.

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Objective: This study aims to determine the effect of using multivitamins in different estrus synchronization hormone protocols on estrus response, estrus onset, estrus duration, estrus intensity, and pregnancy rate in swamp buffalo. Materials and Methods: This study used 30 post-partum adult buffalo, with three estrus synchronization methods treated: 1. Conventional plus Prostaglandin F2 α (PGF2α-PGF2α + multivitamin)-AI; 2. Co-synch plus Gonadotropin-releasing hormone (GnRH-PGF2α + multivitamin)-AI; 3. Combination of hormone plus (Estrogen-Progesterone-PGF2α + multivitamin)-AI. Research vari

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2

Harl, Audra W., Verónica M. Negrón-Pérez, Jacob W. Stewart, George A. Perry, Alan D. Ealy, and Michelle L. Rhoads. "Follicular Fluid from Cows That Express Estrus During a Fixed-Time Artificial Insemination Protocol Promotes Blastocyst Development." Journal of Developmental Biology 13, no. 2 (2025): 14. https://doi.org/10.3390/jdb13020014.

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It is not yet understood why cows that exhibit estrus and ovulate are more likely to become pregnant than those that ovulate but do not exhibit estrus during a fixed-time artificial insemination (FTAI) protocol. The objective of this work was to determine whether the follicular fluid from cows that exhibit estrus contributes to the increased likelihood of pregnancy. Lactating crossbred cows were subjected to an FTAI estrous synchronization protocol. Estrous behavior was observed and recorded prior to transvaginal follicle aspiration from cows that did (estrus, n = 7) or did not exhibit estrus

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3

Thomas, Jordan M., William R. Lamberson, and John B. Hall. "PSXIII-22 Modeling the optimal time point at which to perform timed artificial insemination." Journal of Animal Science 97, Supplement_3 (2019): 371. http://dx.doi.org/10.1093/jas/skz258.739.

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Abstract Timing of artificial insemination (AI) critically impacts likelihood of pregnancy success. In modern timed AI protocols for cattle, AI is performed at a predetermined time point following estrus synchronization. As a result, there may be significant variation among cows or heifers in estrous status and in timing of insemination relative to estrus onset. Recommendations as to when timed AI should be performed are formulated based on research trials evaluating alternative time points. However, available data are limited, as such trials are costly and require large numbers to detect sign

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4

Knickmeyer, Emma R., Jordan M. Thomas, James William C. Locke, et al. "PSXIII-12 Evaluation of split-time artificial insemination following administration of the 7-d CO-Synch + CIDR® estrus synchronization protocol in beef heifers." Journal of Animal Science 97, Supplement_3 (2019): 374. http://dx.doi.org/10.1093/jas/skz258.745.

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Abstract Estrous response and pregnancy rates resulting from fixed-time (FTAI) or split-time (STAI) artificial insemination were compared among heifers following treatment with the 7-d CO-Synch + CIDR® (controlled internal drug release;1.38g progesterone) protocol. Heifers (n = 456) were assigned to balanced treatments based on weight and reproductive tract score (RTS; Scale 1–5). Gonadotropin-releasing hormone (GnRH; 100 µg gonadorelin acetate) was administered coincident with CIDR® insertion. Progesterone inserts were removed after 7 d, and PG (250 mg im cloprostenol sodium) was administered

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5

Solodowa, Elena V., and Anna V. Kalinova. "THE EFFECT OF HORMONAL TREATMENTS ON THE PREGNANCY RATES OF MARES." Siberian Journal of Life Sciences and Agriculture 14, no. 2 (2022): 326–37. http://dx.doi.org/10.12731/2658-6649-2022-14-2-326-337.

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To determine the effect of hormonal drugs on the pregnancy rates of mares, authors analyzed this indicator in natural (n=303) and stimulated cycles (n=170). They used cloprostenol preparations to shorten the diestral period, and human chorionic gonadotropin [hCG] to induce ovulation. Natural cycles are divided into groups, depending on the duration – normal and short (19–24 and 12–18 days, respectively). Stimulated cycles for the following groups: (1) short (8–18 days); (2) normal (19–24 days) with the use of cloprostenol and hCG; (3) normal – with the use of hCG only. Short, both natural and

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6

Efendy, Jauhari, and Frediansyah Firdaus. "Deskripsi dan fenomena yang terjadi pada perkawinan alami sapi Peranakan Ongole (PO) dengan sapi Bali di Kandang Percobaan Loka Penelitian Sapi Potong." Livestock and Animal Research 19, no. 1 (2021): 54. http://dx.doi.org/10.20961/lar.v19i1.41835.

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<p><strong>Objective:</strong> To determine the natural mating behavior pattern of PO bulls with Bali cows in the cattle breeding system using freestall housing of “Litbangtan Model”.</p><p><strong>Methods:</strong> The materials were 63 livestock; 3 PO bulls and 60 Bali cows. The study was designed with a randomized block design (RBD) with three treatments based on the physiological status of Bali cows; namely Treatment A: 20 heifers, Treatment B: 10 heifers and 10 cows, and Treatment C: 20 cows. The parameters observed were the pattern of estrous beh

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7

Sianturi, Riasari Gail, B. Purwantara, I. Supriatna, Amrozi ., and P. Situmorang. "Optimizing artificial insemination on swamp buffalo (Bubalus bubalis) through synchronization of estrus and ovulation." Jurnal Ilmu Ternak dan Veteriner 17, no. 2 (2013): 92–99. https://doi.org/10.14334/jitv.v17i2.682.

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Анотація:

Artificial insemination (AI) program in swamp buffalo will be more efficient by implementing synchronization of estrus and ovulation. By synchronizing of ovulation, AI can be done at a fixed time schedule without concerning to estrus detection. Gonadotropin Releasing Hormone (GnRH) and human chorionic gonadotropin (hCG) have been used in protocols of estrus synchronization to induce ovulation. A study of AI in swamp buffalo was conducted on 83 buffaloes to evaluate the impact of protocol of estrus synchronization on reproductive efficiency of swamp buffalo. The three protocols used were Ovsync

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8

Smith, Emily G., Rachael C. Bonacker, Carson M. Andersen, and Jordan M. Thomas. "142 Evaluation of estrus detection patches as a tool to classify postpartum beef cows as estrous cycling or anestrous prior to the start of the breeding season." Journal of Animal Science 98, Supplement_4 (2020): 116–17. http://dx.doi.org/10.1093/jas/skaa278.212.

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Abstract Estrus detection patches were evaluated as a tool to classify postpartum cows as estrous cycling or anestrous at the start of the breeding season. EstrotectTM Breeding Indicators were applied to 257 postpartum beef cows in three locations 25 days prior to the start of estrus synchronization. Coincident with the start of estrus synchronization, patches were scored using a 1 to 4 scale (1 = 0–25%; 2 = 25–50%; 3 = 50–75%; 4 = 75–100%) with scores of 3 or 4 considered activated. Blood samples were collected from each cow 10 days prior to, and at the start of the estrus synchronization. Se

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9

Tippenhauer, Christie Marie, Jan-Lukas Plenio, Augusto Madureira, Wolfgang Heuwieser, and Stefan Borchardt. "Timing of Artificial Insemination Using Sexed or Conventional Semen Based on Automated Activity Monitoring of Estrus in Holstein Heifers." Animals 13, no. 19 (2023): 2994. http://dx.doi.org/10.3390/ani13192994.

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Investigations on the optimum timing of artificial insemination (AI) following automated activity monitoring (AAM) depending on different types of semen in heifers are limited and in part show controversial results. Therefore, the objective of this observational study was to determine the association between the timing of AI using different characteristics of estrus (i.e., the onset, peak, and end of estrus) and pregnancy per AI (P/AI) in Holstein heifers. Heifers were fitted with a neck-mounted AAM system and inseminated with frozen conventional and sexed semen. The pregnancy per AI (n = 4159

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10

Kusumaningrum, DA, S. Sopiyana, E. Gustiani, et al. "Estrus response to estrus synchronization using prostaglandin nanoparticle in beef cattle in Majalengka regency." IOP Conference Series: Earth and Environmental Science 1377, no. 1 (2024): 012073. http://dx.doi.org/10.1088/1755-1315/1377/1/012073.

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Abstract The study was conducted to determine the estrus response to the applying of prostaglandin nanoparticles (PNp) in two different estrous synchronization protocols. The estrus synchronization occurred in the Majalengka Regency in different years at the same location. The first study (study 1), estrus synchronization was carried out using a single PNp injection protocol, which was preceded by corpus luteum (CL) selection (21 cows). The second study (study 2), double PNp injections were carried out at day-0 and day-11 without prior CL selection (23 cows). The observation of estrus: onset o

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11

Kolikapongu, Ramya Sri, Sharath Chandra Namani, Arshad Shaik, et al. "PSIII-12 The Effects of PGF2 and PGF2 Plus Gnrh on Estrous Behavior and Pregnancy Outcomes in Dairy Goats." Journal of Animal Science 101, Supplement_3 (2023): 390–91. http://dx.doi.org/10.1093/jas/skad281.462.

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Abstract Artificial insemination protocols depend on efficient behavioral estrus detection and insemination time in dairy goats. Here we examined the effects of two synchronization protocols, prostaglandin F2α (PGF2α; protocol 1) and PGF2 plus gonadotropin-releasing hormone (GnRH; protocol 2) on estrus behavior, body temperature, pulse frequency, pregnancy protein B (PPB) concentrations, and pregnancy rates in Alpine and Saanen goats. Forty does (3.9 ± 0.28 year) were divided into two groups (20 each) with 10 Alpine and 10 Saanen females in each group. In protocol 1 goats were injected with 10

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12

Phatak, A. P., and H. L. Whitmore. "Greater participation by veterinarians in the reproductive management of dairy cattle." Journal of the American Veterinary Medical Association 199, no. 1 (1991): 74–76. http://dx.doi.org/10.2460/javma.1991.199.01.74.

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Summary A program involving greater veterinary participation in detection of estrus and artificial insemination of cattle was evaluated in a 700-cow dairy herd from January 1987 through August 1988. Previous reproductive performance was below normal. First-service pregnancy rate from artificial insemination was 42%, and mean number of nonpregnant days for the cows was 120. Between postpartum days 55 and 62, all cows with functional corpus luteum assessed by rectal palpation were administered prostaglandin each Monday morning. Return visits were made to the herd each Thursday and Friday to obse

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13

Park, J. K., S. Y. Jung, S. H. Park, et al. "73 RE-CLONING BY SOMATIC CELL NUCLEAR TRANSFER FROM A CLONED KOREAN NATIVE GOAT." Reproduction, Fertility and Development 19, no. 1 (2007): 154. http://dx.doi.org/10.1071/rdv19n1ab73.

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Nuclear transfer (NT) is one of the most advanced technologies to increase animal efficiency in livestock production. Re-cloning can be utilized to investigate more effective methods for agricultural, biological, and medical research. However, few studies have been undertaken on re-cloning from cloned animals. The present study was conducted to examine some factors affecting in vitro development of re-cloned embryos and pregnancy by somatic cell nuclear transfer (SCNT). Ear fibroblast cells as karyoplast donors were isolated from a cloned Korean goat, Jinsoonny, 3 weeks after birth and culture

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14

Nuryanto, Lilik Bawa, Ristika Handarini, and Yanyan Setiawan. "ESTRUS RESPONSE HOLSTEIN FRIESIAN COW PERANAKAN WHO INJECTED PROSTAGLANDIN IN INTRAMUSCULAR AND INTRAUTERINE." Jurnal Peternakan Nusantara 3, no. 2 (2018): 81. http://dx.doi.org/10.30997/jpnu.v3i2.929.

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This study was aimed to compare the different responses of cattle estrus and pregnancy rate FH (Friesian Holsein) were injected with the prostaglandin hormone by intramuscular and intra-uterine. This study was used 20 cows FH on condition of normal reproductive function, not in a state of pregnant (confirmed by rectal palpation), visually not fat and not skinny, not reproductive disease, normal estrous cycles. Cows were divided into two treatment, P1: estrus synchronization by intra muscular (IM), P2: estrus synchronization by intrauterine (IU). Data were analyzed by T test, to compare the dif

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15

Aoyagi, Y., A. Ideta, M. Matsui та ін. "206 EFFECTS OF A COMBINATION OF A PRID, PGF2α AND eCG, ON ESTRUS SYNCHRONIZATION AND PREGNANCY RATE FOLLOWING EMBRYO TRANSFER IN HOLSTEIN HEIFERS". Reproduction, Fertility and Development 19, № 1 (2007): 220. http://dx.doi.org/10.1071/rdv19n1ab206.

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Successful bovine embryo transfer requires synchronization of luteolysis, estrus and ovulation. The objective of the present study was to evaluate the effect of a combination of a PRID, PGF2� and eCG, on estrus synchronization and pregnancy rate in recipient heifers. A PRID� (ASKA Pharmaceutical Co., Ltd., Tokyo, Japan) was inserted into the vagina at random days of the estrous cycle for 7 (n = 35) or 9 (n = 43) days. Two days before removal of the PRID, the heifers were injected with PGF2� IM (2 mL Resipron�-C containing 0.25 mg mL-1 cloprostenol; ASKA). About half of the heifers in each grou

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16

Mielke, Laís, Mityelle Da Costa Chaves Rodrigues, Márcio Érpen Lima, et al. "Effect of GnRH or Estradiol Benzoate on Reproductive Traits during a Heatsynch Protocol in Dairy Cows." Acta Scientiae Veterinariae 44, no. 1 (2018): 7. http://dx.doi.org/10.22456/1679-9216.81210.

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Background: Milk production of cows is closely correlated with its reproductive efficiency. One of the several factors influencing the dairy efficiency is the decline in fertility of the cows/heifers. Use of hormonal protocol are often used to improve the fertility of the recipients. Several programs are available to inseminate dairy cows, with variation in the use of different types of hormones, time of use and range of duration period, as well as the time of AI. The objective of this study was to evaluate the efficiency of follicular wave emergence induction of estradiol benzoate in comparis

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17

Siregar, Nur Asyiah, Sayed Umar та Ristika Handarini. "Impact of Estrus Response and Pregnancy Rate of Two Cows That are Injected with Prostaglandin F2α Hormone in the System Maintenance is Different to Livestock Farming". Randwick International of Social Science Journal 5, № 3 (2024): 484–92. http://dx.doi.org/10.47175/rissj.v5i3.1034.

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Livestock farming is an effort to breed livestock to obtain benefits or results in the form of products and income. The success of a livestock business depends on three elements commonly referred to as the production triangle, namely seeds, feed, and management. In addition, the techno-socioeconomic characteristics of livestock farmers greatly influence the development of livestock businesses and will later affect the income of livestock farmers. The aim of the research was to examine the injection of the prostaglandin F2α hormone on the estrus response and pregnancy in Ongole crossbreed and S

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18

Fonseca, J. F., V. V. Maffili, A. D. F. Santos, et al. "Effects of prostaglandin administration 10 days apart on reproductive parameters of cyclic dairy nulliparous goats." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 64, no. 2 (2012): 349–58. http://dx.doi.org/10.1590/s0102-09352012000200014.

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This study reported the effects of prostaglandin (PGF2a) administration 10 days apart on reproductive parameters of cyclic artificial inseminated (AI) nulliparous Alpine (n=9) and Saanen (n=9) goats. Animals received two doses of 22.5mg PGF2a 10 days apart. After 1st and 2nd PGF2a administrations, estrus was monitored at 12 h intervals, with a buck teaser. Plasma progesterone concentration (ng/mL) was determined from blood sampled on day 0 (1st PGF2a) and the following 5, 10 (2nd PGF2a), 15, 20, 25 and 30 days. After the onset of the second estrus, females were transrectally (5 MHz probe) scan

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19

Andriyanti, Silvia Rani, Mas’ud Hariadi, Roesno Darsono, and Pudji Srianto. "Test Various Estrus Detection Device Against Pregnancy Rates on Dairy Cows in Cooperative Tunas Setia Baru Kabupaten Pasuruan." KnE Life Sciences 3, no. 6 (2017): 712. http://dx.doi.org/10.18502/kls.v3i6.1201.

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This research aims to determine the use of various estrus detection devices before artificial insemination as measured by pregnancy rate. The researcher used a sample of 60 cows were used in this research which is divided into four groups as a control and treatment groups (Thermopin®, Hauptner and Draminski groups), and each cow was detected for the sign of estrus by three devices that were Thermopin®, Hauptner and Draminski prion when doing an artificial insemination. The cows were observed to 45 days after artificial insemination for observing pregnancy. This research method is the explorati

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20

Bonato, Denis Vinicius, Luigi Carrer Filho, Eriko Silva Santos, et al. "Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone." Semina: Ciências Agrárias 42, no. 6supl2 (2021): 3825–36. http://dx.doi.org/10.5433/1679-0359.2021v42n6supl2p3825.

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We evaluated the effects of nulliparous, primiparous, and multiparous conditions on the estrus and pregnancy rates in females that did not show estrus but were treated with gonadotropin-releasing hormone (GnRH) at the time of timed artificial insemination (TAI). Nelore females (n = 531) were allocated according to the following categories: nulliparous (n = 144), primiparous (n = 132), and multiparous (n = 255). The animals received a conventional TAI protocol, and estrus expression was identified by the absence of paint in the sacrococcygeal region on the day of TAI. Females that did not show

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21

Budiyanto, Agung. "Kajian Metode Aplikasi Sinkronisasi Birahi menggunakan PGF2α pada kambing terhadap kualitas estrus, konsentrasi progesterone dalam darah dan tingkat kebuntingannya". Jurnal Sain Veteriner 38, № 3 (2020): 272. http://dx.doi.org/10.22146/jsv.60468.

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A study of the application method of estrus synchronization with prostaglandin 2 alpha (PGF2α) preparations in local goats in Yogyakarta to determine the effectiveness of estrus synchronization based on the quality of estrus, the concentration of the hormone progesterone in the blood and the level of pregnancy have been done. The low pregnancy rate in goats is caused by a short time of heat and mating behavior that is not clear, resulting in low reproductive performance. The application of lust synchronization technology is expected to solve this problem. Prostaglandin F2α (PGF2α) is commonly

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22

Thundathil, J., J. P. Kastelic, W. O. Olson, R. B. Cook та R. J. Mapletoft. "Melengestrol acetate, estradiol-17β and GnRH for synchronization of estrus and ovulation in beef cows". Canadian Journal of Animal Science 79, № 1 (1999): 39–43. http://dx.doi.org/10.4141/a98-089.

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Three experiments were conducted with suckled crossbred beef cows to determine the efficacy of various short-term regimens for synchronizing estrus or ovulation and to determine whether feeding melengestrol acetate (MGA) after timed AI will increase pregnancy rate. In exp. 1, all cows (n = 141) were given 0.5 mg MGA head−1 d−1 for 7 d (days 1 to 7), 1 or 5 mg E17β (and 100 mg progesterone) or 100 µg GnRH on day 1, and 500 µg cloprostenol on day 7. There were no significant differences among groups for estrous or synchronized conception rates (average, 84.4 and 52.1%, respectively). With an ide

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23

BORŞ, SILVIU-IONUȚ, ȘTEOFIL CREANGĂ, and ALINA BORŞ. "Improving the net present value by estrus synchronization in non-pregnant dairy cows detected by ultrasound 25 days after artificial insemination." Romanian Biotechnological Letters 26, no. 4 (2021): 2818–24. http://dx.doi.org/10.25083/rbl/26.4/2818-2824.

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Pregnancy rates in Holstein cow showed a substantial decline in the past years, which caused intensive estrus synchronization programs for non-pregnant cows to shorten the period between an unsuccessful artificial insemination (AI) and the next attempt on the same cow. The program implied estrus synchronization of non-pregnant cows with either prostaglandin or GnRH followed by prostaglandin after 7 days, then GnRH 2 days later and AI during the following day. Cows included in the estrus synchronization program recorded an improvement of the pregnancy rate at 130 days in milk compared to those

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24

Солодова, Е. В. "ANALYSIS OF PREGNANCY RATE IN NATURAL AND STIMULATED CYCLES OF DIFFERENT DURATION." Horse breeding and equestrian sports, no. 1 (April 4, 2019): 20–23. http://dx.doi.org/10.25727/hs.2019.1.27677.

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Был проведён сравнительный анализ зажеребляемости кобыл в естественных и гормонально стимулированных циклах различной продолжительности. Анализ показал (n=429), что зажеребляемость во всех циклах, кроме укороченных, колеблется от 71,4 до 79,0%. В естественных укороченных циклах зажеребляемость значительно понижена и составляет 57,7%. При разделении гормонально стимулированных циклов по продолжительности эструса выяснилось, что в циклах с укороченным эструсом (2-3 дня) зажеребляемость снижается до 60,9% по сравнению с циклами, длина эструса в которых составляет 4-6 дней (82,2%). It was carried

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25

Souhayla O. Hussain and Jawad K. Taher. "Study of estrogen, progesterone and glucose level in cows during overt and silent estrus." University of Thi-Qar Journal of agricultural research 11, no. 1 (2022): 79–83. http://dx.doi.org/10.54174/utjagr.v11i1.163.

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Анотація:

Significant economic losses result from increased days open because of failure to detect estrus. Studies (Callahan, et al., 1971; Kesler,et al., 1977) suggest that the endocrine balances required to support normal estrus cycles and for the reestablishment of fertility are restored gradually after calving. Silent estrus, or the lack of behavioral estrus expression, is a common occurrence (50 to 80%) at the first postpartum ovulation. However, the incidence of silent estrus decreases in the second and third estrous cycles (Bulman,1980 ; Labhsetwar, et al., 1946; Morrow, et al., 1966). Expression

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26

Siregar, Tongku N. "Upaya Meningkatkan Intensitas Berahi Pada Kerbau Dalam Hubungannya Dengan Peningkatan Angka Konsepsi Hasil Inseminasi Buatan." Jurnal Ilmiah Ilmu-Ilmu Peternakan 11, no. 4 (2008): 69–74. http://dx.doi.org/10.22437/jiiip.v11i4.735.

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This experiment was conducted to determine the corelation between estrous intensity and increasing conception rate which is resulted from artificial insemination at local buffalo. For that purpose, 15 local female buffaloes belong to farmer in Lampu’uk Kuta Baro Aceh Besar, were used. The buffaloes were divided into two groups randomly, which consist of five buffaloes for control and ten bufflaoes for treatment groups. The first group were not given any treatment and performed the estrus naturally, while the second group were synchronized the estrous time with CIDR-B. Insemination in control g

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27

Havelka, Garrett, Friederike Baumgaertner, Kerri A. Bochantin, et al. "PSIII-7 7&7 Synch improved pregnancy rates in beef cows experiencing estrus over 24 h before fixed-time insemination." Journal of Animal Science 102, Supplement_2 (2024): 332–33. http://dx.doi.org/10.1093/jas/skae102.379.

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Abstract Our objectives were to compare estrus response and pregnancy rates between two different estrus synchronization protocols and between cows that experienced estrus more than 24 h before appointment breeding and those that experienced estrus less than 24 h before breeding. Over each of 2 yr, postpartum beef cows (n = 1,108) from two different locations were ranked by days postpartum and randomly selected to receive either; 1) 7-d CO-Synch + CIDR (CO-Synch, n = 547), or; 2) 7 & 7 Synch (7&7, n = 561). For the CO-Synch treatment, cows received a controlled internal drug release in

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Abulaiti, Adili, Zahid Naseer, Zulfiqar Ahmed, Dong Wang, Guohua Hua, and Liguo Yang. "Effect of Different Synchronization Regimens on Reproductive Variables of Crossbred (Swamp × Riverine) Nulliparous and Multiparous Buffaloes during Peak and Low Breeding Seasons." Animals 12, no. 4 (2022): 415. http://dx.doi.org/10.3390/ani12040415.

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The present study was conducted to examine the effect of conventional the Ovsynch protocol (OVS) and a modified Ovsynch synchronization (GPGMH) protocol on the follicular dynamics, estrus, ovulation, and pregnancy in nulliparous and multiparous crossbred (swamp × riverine) buffaloes during different seasons. GPGMH or OVS protocols were used to synchronize nulliparous (n = 128; GPGMH = 94, OVS = 34) and multiparous (n = 154; GPGMH = 122, OVS = 32) buffaloes during the peak (n = 186; GPGMH = 143, OVS = 43) and low breeding (n = 96; GPGMH = 73, OVS = 23) seasons. Buffaloes were monitored for foll

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Hidayah, Chomsiatun Nurul, M. Y. Sumaryadi, D. M. Saleh, A. P. Nugroho, and A. D. Nurasih. "Relationship of Gonadotropin-Releasing Hormones (GnRH) Induction to Reproductive Performance in Batur Sheep." Proceeding ICMA-SURE 2, no. 1 (2023): 140. http://dx.doi.org/10.20884/2.procicma.2023.2.1.7826.

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Анотація:

Experiments were performed to determine the relationship of Gonadotropin-Releasing Hormone (GnRH) induction to estrus activity and pregnancy rate of Batur sheep. Twenty Batur sheep were synchronized to estrus using intramuscularly injection of 2 ml PGF2α that repeated in 11-day intervals. GnRH was given intramuscularly on the 9th day for 10 Batur sheep, and 10 others were not injected as a control. Reproductive performance included estrus intensity, estrus onset, mating time period, and pregnancy rate. The data were analyzed by regression correlation tests, and chi-square test were used for pr

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Quail, Lacey K., Kaitlin M. Epperson, Jaclyn N. Ketchum, Chloey Guy, Chalies Long, and George A. Perry. "291 Synchronization and Seasonality Effects on Follicular Development, Estrus Expression, and Pregnancy in Brahman Females." Journal of Animal Science 100, Supplement_3 (2022): 140. http://dx.doi.org/10.1093/jas/skac247.258.

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Abstract Control of follicular development is essential for estrous synchronization. This experiment determined differences in follicular development during synchronization in Brahman females. Cows (n=219) and heifers (n=90) in Fall (n=170) and Spring (n=139) were synchronized with a CIDR insert and administration of GnRH or PG treatment on d0 (1/2GnRH: n=106, GnRH: n=103, PG: n=100), and CIDR removal and PG administration on d6 followed by estrus detection and AI for 96h. Blood samples were collected on d0, d6, and d8 and/or AI to determine circulating progesterone (P4) concentrations. Transr

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Andriyanti, Silvia Rani, Mas’ud Hariadi, Roesno Darsono, Pudji Srianto, Wurlina Wurlina, and Tjuk Imam Restiadi. "UJI BERBAGAI ALAT DETEKSI BIRAHI TERHADAP ANGKA KEBUNTINGAN PADA SAPI PERAH DI KOPERASI TUNAS SETIA BARU KABUPATEN PASURUAN." Ovozoa : Journal of Animal Reproduction 7, no. 2 (2020): 156. http://dx.doi.org/10.20473/ovz.v7i2.2018.156-159.

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This research aims to determine the use of various estrus detection devices before artificial insemination as measured by pregnancy rate. The researcher used a sample of 60 cows were used in this research which is divided into four groups as a control and treatment groups (Thermopin®, Hauptner and Draminski groups), and each cow was detected for the sign of estrus by three devices that were Thermopin®, Hauptner and Draminski prion when doing an artificial insemination. The cows were observed to 45 days after artificial insemination for observing pregnancy. This research method is the explorati

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Kastelic, J. P., D. H. McCartney, W. O. Olson, A. D. Barth та R. J. Mapletoft. "Melengestrol acetate and estradiol-17β for synchronizing estrus and improving reproductive performance in beef cattle". Canadian Journal of Animal Science 77, № 4 (1997): 683–88. http://dx.doi.org/10.4141/a97-032.

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Four experiments were conducted to investigate the use of melengesterol acetate (MGA) and estradiol-17β (E-17β) for synchronizing estrus and improving reproductive performance in beef cattle. Synchronized pregnancy rates were higher (P < 0.05) in heifers fed MGA after AI than controls (4 of 9 versus 0 of 7, respectively), but were not different for cows (20 of 37, 54% versus 23 of 40, 58%). Estrus rate (percentage of cows detected in estrus) was higher (P < 0.05) for cows treated with E-17β + MGA compared with those treated with cloprostenol alone (85.0 versus 65.9%). Synchronized pregna

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Rocha, Cecilia c. Constantino, Ana B. Montevecchio, Mackenzie Mazziotta, et al. "102 Estradiol and follicular growth are associated with estrous behavior monitored by an accelerometer in grazing beef cows." Journal of Animal Science 102, Supplement_1 (2024): 37–38. http://dx.doi.org/10.1093/jas/skae019.042.

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Abstract In beef cattle, 40% of cows that display estrus do not remain pregnant after embryo transfer (ET). Estrus is a physiological behavior influenced by the concentration of sex-steroids. The use of accelerometer devices for estrus detection is a common practice in dairy operations. It remains unclear if this same artificial intelligence software can accurately measure reproductive behavior in beef females. We hypothesized that estrous variables detected by an accelerometer are associated with ovarian, hormonal, pregnancy outcome, and fertility-related variables measured in the cow. Fifty

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Yendraliza, Yendraliza, Lia Lia, Jully Handoko, and Anwar Efendi Harahap. "Estrus Performance and Pregnancy Rate in Types of Local Cows on Different Estrus Synchronization Protocols." ANIMAL PRODUCTION 21, no. 2 (2020): 71. http://dx.doi.org/10.20884/1.jap.2019.21.2.722.

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The research aimed to evaluate the onset of estrus, conception rate, pregnancy rate and duration of estrus in Bali cow, limousine cow and rambon cow after being administered with three different hormones to syncrhronize estrus. A randomized block design with two factors, type of cow and hormone dose, was performed. Fifty-four postpartum cows consisted of the three breeds were administered to a single dose of PGF2α (5 ml per cow), a double dose of PGF2α (10 ml per cow) and combination of PGF2α and hCG (1,500 IU per cow). An analysis of variance showed that different breeds did not associate wit

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Batsaikhan, D., B. Bayar-Enkh, and B. Tuvshin. "Interrelationship of some hormonesbelonging to HPG and energy axes inhorses during various reproductive states." Mongolian Journal of Agricultural Sciences 15, no. 2 (2015): 10–15. http://dx.doi.org/10.5564/mjas.v15i2.538.

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In order to reveal interrelationships of hormones during pregnancy and estrus in animals, some reproductive and metabolic hormones including FSH, inhibin B, prolactin and insulin were measured in blood serum of Mongolian horses with respective immunoassays. Concentrations of blood serum FSH, inhibin B and prolactin in mares during their estrus, early, mid and late pregnancy periods were compared. The comparisons demonstrate concentrations of FSH and inhibin B were inversely proportional especially during estrous cycle of mares. As well, these hormones were also measured in blood serum of stall

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Drh., M.Sc, Ginta Riady, Dian Mulfristia, Hendra Saputra, et al. "Determination of estrus duration based on cervical mucus characteristics in Aceh cattle using camera-equipped artificial insemination endoscope." Ovozoa : Journal of Animal Reproduction 11, no. 2 (2022): 59–65. http://dx.doi.org/10.20473/ovz.v11i2.2022.59-65.

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This study aimed to determine the length of the estrus period in Aceh cows based on changes in the characteristics of cervical mucus observed using a camera-equipped artificial insemination (AI) endoscope. This study used twelve healthy and reproductively sound cows aged 4-6 years. All cows were synchronized using prostaglandin F2α (PGF2α) injected intramuscularly twice, 11 days apart. Estrus detection was conducted 24 hours following the second injection of PGF2α three times daily for 30 minutes, respectively. Estrous cows were then subjected to the examination of their cervical mucus at 0, 6

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Susilowati, Suherni, Tri Wahyu Suprayogi, Tatik Hernawati, Yossy Imam Candika, and Widya Paramita Lokapirnasari. "Intracervical Artificial Insemination using Frozen Semen of Boer buck on Pote Does at Different Times of Estrus." Ovozoa: Journal of Animal Reproduction 12, no. 1 (2023): 17–23. http://dx.doi.org/10.20473/ovz.v12i1.2023.17-23.

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Pote goats are kept by the rural community in Bangkalan Regency, Madura Island, Indonesia. Estrus symptoms in goats are usually unclear, causing low fertility. This study aimed to determine the intracervical artificial insemination at early and mid-estrus on the Pote does. The 24 the does were randomly divided into two groups and estrous synchronization with PGF2α of 200 µg intramuscularly, twice injections with 11 days intervals. The T1 groups of estrus the Pote does were inseminated at early estrus (0-12 hours). Meanwhile, T2 groups of estrus the Pote does were inseminated at mid-estrus (12-

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Jaworska, Joanna, Amanda M. de Mestre, Joanna Wiśniewska, et al. "Populations of NK Cells and Regulatory T Cells in the Endometrium of Cycling Mares—A Preliminary Study." Animals 12, no. 23 (2022): 3373. http://dx.doi.org/10.3390/ani12233373.

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Endometrial immune cells are essential to support uterine functions across the estrous cycle and in preparation for pregnancy. It has been acknowledged that changes in phenotype and/or numbers of lymphocytes, such as regulatory T cells (Tregs) and NK cells, might result in lower fertility in women and mice. Little is known about equine endometrial immune cells across the estrous cycle. Here, we compared the populations of endometrial Tregs and NK cells in estrus and diestrus in mares. Endometrial biopsy and blood samples were taken in estrus and diestrus from 11 mares ages 4–12 years. Flow cyt

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Silva, Regina Oliveira da, Roseane Pinto Martins de Oliveira, André Ferreira Silva, Franklyn Ferreira de Oliveira, João Paulo Ferreira Rufino, and Márcia Lorena Monteiro da Silva. "Effect of different protocols for estrus synchronization on reproductive performance of Santa Inês ewes under Amazon environmental conditions." Acta Scientiarum. Animal Sciences 43 (August 19, 2020): e48954. http://dx.doi.org/10.4025/actascianimsci.v43i1.48954.

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Анотація:

The objective of this study was to evaluate the effect of different hormonal protocols on the reproductive performance of Santa Inês ewes in Amazon environmental conditions. Twenty-two Santa Inês ewes between 3 and 4 years-old were distributed in a randomized block experimental design, where the treatments consisted of two protocols for estrus synchronization (short and long) with eleven animals each. Data on the occurrence of estrus were described for each protocol. Data of estrus, pregnancy, and prolificity were firstly subjected to ANOVA and a subsequent Tukey’s test. Results were considere

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Arend, Lidia S., Robert V. Knox, Laura L. Greiner, Amanda B. Graham, and Joseph F. Connor. "Effects of feeding melatonin during proestrus and early gestation to gilts and parity 1 sows to minimize effects of seasonal infertility1." Journal of Animal Science 97, no. 11 (2019): 4635–46. http://dx.doi.org/10.1093/jas/skz307.

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Abstract This study tested whether supplemental melatonin given to mimic the extended nighttime melatonin pattern observed in the higher fertility winter season could minimize infertility during summer and fall in swine. Exogenous melatonin was fed during periods coinciding with follicle selection, corpus luteum formation, pregnancy recognition, and early embryo survival. Experiments were conducted at a commercial farm in 12 sequential replicates. In Exp. 1a, mature gilts (n = 420) that had expressed a second estrus were assigned by weight to receive once daily oral Melatonin (MEL, 3 mg) or Co

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Kurniati, Weni, Muhammad Agil, Bambang Purwantara, and Muhammad Imron. "Recipient Selection to Support The Success Rate of Frozen-Thawed Belgian Blue Embryo Transfer." E3S Web of Conferences 151 (2020): 01048. http://dx.doi.org/10.1051/e3sconf/202015101048.

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Frozen-thawed Belgian Blue (BB) Embryo transfer (TE) is an effort of fulfilling meat demand in Indonesia. This research aimed at observing the correlation between estrus expressions of standing heat and the correlation of CL characteristics on the success rate of frozen-thawed BB embryo transfer. The study was conducted on 55 recipient cattle with 62 times of TE application, which were categorized into three groups, namely FTET estrus synchronization (n=14), 24-hour natural estrus detection (n=30) and twice-a-day natural estrus detection (n=18). The implemented synchronization was the combinat

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Goncalves, Lucas Melo, Samir Burato, Madison Walker, et al. "100 Impact of luteal blood perfusion and estrus expression on pregnancy rates of beef cows exposed to embryo transfer." Journal of Animal Science 102, Supplement_3 (2024): 267–68. http://dx.doi.org/10.1093/jas/skae234.308.

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Abstract This study aimed to evaluate the impact of luteal blood perfusion and estrus expression on pregnancy rates of beef cows exposed to fixed-timed embryo transfer (FTET). Postpartum beef cows (n = 763) from 22 locations were exposed to a 7-d Select Synch + controlled internal drug releasing (CIDR) and breeding indicator patches were affixed upon CIDR removal. Estrus expression was assessed twice daily for 72 h and a 100-µg injection of gonadotropin-releasing hormone was administered to cows that failed to express estrus 72 h after CIDR removal. Brightness mode ultrasonography of the corpu

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HILL, G. M., and R. A. GODKE. "LIMITED NURSING EFFECTS ON REPRODUCTIVE PERFORMANCE OF PRIMIPAROUS AND MULTIPAROUS COWS AND PREWEANING CALF PERFORMANCE." Canadian Journal of Animal Science 67, no. 3 (1987): 615–22. http://dx.doi.org/10.4141/cjas87-064.

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Effects of limited nursing and parity of the dam on cow reproductive and calf gain performance were determined in two experiments involving 97 beef cow-calf pairs. Fall-calving (exp. 1) and spring-calving (exp. 2) primiparous (P) and multiparous (M) cows were assigned to control (C) or limited nursing (L) treatments at 21–28 d postpartum. Cows and calves continued on nursing treatments until first estrus was detected, or until 42 d had elapsed. Nursing treatment and parity of the dam influenced estrous activity in exp. 1. Higher (P < 0.05) percentages of multiparous dams and of L treatment

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Szalai, Szilvia, Ákos Bodnár, Hedvig Fébel, Mikolt Bakony, and Viktor Jurkovich. "Effects of Heat Stress on Estrus Expression and Pregnancy in Dairy Cows." Animals 15, no. 12 (2025): 1688. https://doi.org/10.3390/ani15121688.

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This study investigated how environmental temperature affects estrus behavior and pregnancy rates in lactating dairy cows during induced estrus. We hypothesized that higher temperatures reduce estrus expression and pregnancy rates and influence hormone levels. Fifty-eight healthy, multiparous, ovulation-synchronized cows were studied under heat stress (summer) and non-stress (winter) conditions. Cows were assigned to G7G or OvSynch (OVS) hormone protocols. Blood samples collected on insemination day measured estradiol, LH, prolactin, insulin, and IGF-1 concentrations. Estrus signs and behavior

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Bruno-Galarraga, Macarena, Virginia Cano-Moreno, Beatriz Lago-Cruz, Teresa Encinas, Antonio Gonzalez-Bulnes, and Paula Martinez-Ros. "The Use of hCG for Inducing Ovulation in Sheep Estrus Synchronization Impairs Ovulatory Follicle Growth and Fertility." Animals 11, no. 4 (2021): 984. http://dx.doi.org/10.3390/ani11040984.

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Currently, there is an intense effort to find an alternative hormone to eCG to induce ovulation after estrus synchronization treatments in sheep. One of the proposed alternatives is based on the use of hCG, but the results are controversial since fertility rates are commonly affected. The present study aims to evaluate, therefore, the adequacy of hCG in protocols for the synchronization of estrus and ovulation. Ovarian follicle dynamics, occurrence of estrus behavior and subsequent ovulation, quality of corpora lutea, and pregnancy rate after controlled natural mating were assessed in two cons

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Mariani, A. C. B., J. F. Souza, F. B. Lopes, J. A. T. Souza, J. L. Ferreira, and T. V. Cavalcante. "283 INFLUENCE OF THE MOMENT OF EMBRYO TRANSFER IN PREGNANCY RATES IN FEMALE BOVINE INSEMINATED WITH IVP EMBRYOS OFTHE NELLORE BREED." Reproduction, Fertility and Development 22, no. 1 (2010): 298. http://dx.doi.org/10.1071/rdv22n1ab283.

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The in vitro production (IVP) of bovine embryos is a biotechnique that has created new perspectives in animal reproduction and improvement. However, one of the main issues in the diffusion of this technology concerns the rate of pregnancy of the recipient cows. The objective was to verify the relationship between the fertilization in vitro, the day the recipient female was in estrus, and the pregnancy rates. Two hundred sixty crossbred recipient cows were selected from July to November 2008, synchronized with 2 different protocols at a random moment of the estrous cycle. One of the groups (G1)

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Begum, Salma, Barry E. Perlman, Nuriban Valero-Pacheco, et al. "Dynamic Expression of Interleukin-33 and ST2 in the Mouse Reproductive Tract Is Influenced by Superovulation." Journal of Histochemistry & Cytochemistry 68, no. 4 (2020): 253–67. http://dx.doi.org/10.1369/0022155420911049.

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Interleukin-33 (IL-33) is an IL-1 family cytokine with pleiotropic effects on diverse cell types. Dysregulated IL-33 signaling has been implicated in pregnancy-related disorders, including preeclampsia and recurrent pregnancy loss, and in ovarian function in women undergoing controlled ovarian stimulation for in vitro fertilization. To date, expression of IL-33 and its receptor subunit, ST2, in the female reproductive tract remains poorly characterized. We identify IL-33-expressing oocytes surrounded by ST2-expressing granulosa cells at all stages of follicular development, in addition to IL-3

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Paris, Jason J., and Cheryl A. Frye. "Estrous cycle, pregnancy, and parity enhance performance of rats in object recognition or object placement tasks." REPRODUCTION 136, no. 1 (2008): 105–15. http://dx.doi.org/10.1530/rep-07-0512.

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Ovarian hormone elevations are associated with enhanced learning/memory. During behavioral estrus or pregnancy, progestins, such as progesterone (P4) and its metabolite 5α-pregnan-3α-ol-20-one (3α,5α-THP), are elevated due, in part, to corpora luteal and placental secretion. During ‘pseudopregnancy’, the induction of corpora luteal functioning results in a hormonal milieu analogous to pregnancy, which ceases after about 12 days, due to the lack of placental formation. Multiparity is also associated with enhanced learning/memory, perhaps due to prior steroid exposure during pregnancy. Given evi

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Aydaiso, Wubneh, Chencha Chebo, and Nejib Mohammed. "Evaluation of Oestrus Synchronization Program on Dairy Cattle in South Ari District, South Omo Zone, Southern Ethiopia." OMO International Journal of Sciences 3, no. 2 (2020): 13–29. http://dx.doi.org/10.59122/134a241.

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This study was conducted in South Ari District, South Omo Zone, Ethiopia from 2017-2018 with the objectives of evaluating the performance of hormonal oestrus synchronization program and exploring beneficiaries’ perception. Data on 3881 synchronization records from the year 2011 to 2017 were used to evaluate its effectiveness trend. In addition, 2017 estrus synchronization record data of 408 cows and heifers were collected and used for analysis. Single dose prostaglandin(PGF2ɑ) was administrated to the animals and hormone response and conception and/pregnancy rate was measured. All synchronized

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Bashir, S., and M. T. Tunio. "EFFICACY OF OVULATION SYNCHRONIZATION REGIMENS ON PREGNANCY RATE TO TIMED ARTIFICIAL INSEMINATION IN ACYCLIC POST-PARTUM NILI-RAVI BUFFALOES." Pakistan Journal of Agriculture, Agricultural Engineering and Veterinary Sciences 39, no. 1 (2023): 45–51. http://dx.doi.org/10.47432/2023.39.1.8.

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Анотація:

The present study compared the two ovulation synchronization treatments combined with a progesterone release device in buffaloes. Ninety acyclic buffaloes were divided into three experimental The blood samples were collected before the start of the trial to determine the reproductive status (anestrous and sub-estrous). In G I and G II, CIDR was inserted for seven days and treated with on the 6th day of protocol. In the protocol, the first estradiol benzoate (EB) and doses were given on day 0 and 2nd EB and doses on day 8 to G I and G II groups, respectively. Whereas, G III served as a control

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