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Articles de revues sur le sujet « Ovulation »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 juillet 2025

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1

Poonam, Dr, S. Suman, MK Gupta, and RK Rauniyar. "The Role of Ultrasound in Ovulation Detection Compared To BBT and Other Methods." Nepalese Journal of Radiology 3, no. 2 (2014): 57–64. http://dx.doi.org/10.3126/njr.v3i2.9608.

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Background: The detection of timing of ovulation is an important step in the evaluation and management of subfertility. Ultrasonography plays a vital role in monitoring follicular growth. Aims: To assess the value of ultrasound scanning of the ovaries in the periovulatory period to detect ovulation and to correlate the results with basal body temperature (BBT) chart and other presumptive evidences of ovulation. Methods: In this prospective study, a total of 60 subfertile patients were selected from the outpatient department of obstetrics and gynaecology, BPKIHS, Dharan. BBT charting, midcycle

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Martinez-Ros, Paula, Alejandro Rios-Abellan, and Antonio Gonzalez-Bulnes. "Influence of Progesterone-Treatment Length and eCG Administration on Appearance of Estrus Behavior, Ovulatory Success and Fertility in Sheep." Animals 9, no. 1 (2018): 9. http://dx.doi.org/10.3390/ani9010009.

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The present study characterizes, for sheep, the occurrence and timing of the onset of estrus behavior and ovulation and the yields obtained (ovulation rate, progesterone secretion, and fertility) after Controlled Internal Drug Release (CIDR) insertion for five, six, seven, or fourteen days, with or without equine chorionic gonadotrophin (eCG) in ewes of the Segureña meat breed. All the treatments showed above 80% of females displaying estrus, but the onset of estrus was earlier and more synchronized when using eCG and, among groups with eCG, onset of estrus was earlier in the sheep treated for

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Ginther, O. J., M. O. Gastal, E. L. Gastal, J. C. Jacob, and M. A. Beg. "Induction of haemorrhagic anovulatory follicles in mares." Reproduction, Fertility and Development 20, no. 8 (2008): 947. http://dx.doi.org/10.1071/rd08136.

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A follicular wave and luteolysis were induced in mares by ablation of follicles ≥6 mm and treatment with prostaglandin F2α (PGF) on Day 10 (where ovulation = Day 0). The incidence of haemorrhagic anovulatory follicles (HAFs) in the induced waves (20%) was greater (P < 0.007) than in preceding spontaneous waves (2%). Hormone and follicle dynamics were compared between induced follicular waves that ended in ovulations (ovulating group; n = 36) v. HAFs (HAF group; n = 9). The day of the first ovulation or the beginning of HAF formation at the end of an induced wave was designated as post-treat

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Buranaamnuay, K., P. Tummaruk, and M. Techakumphu. "15 INTRAUTERINE INSEMINATION USING FROZEN - THAWED BOAR SEMEN IN SPONTANEOUS AND INDUCED OVULATING SOWS UNDER FIELD CONDITIONS." Reproduction, Fertility and Development 22, no. 1 (2010): 165. http://dx.doi.org/10.1071/rdv22n1ab15.

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Intrauterine insemination (IUI) using frozen-thawed (FT) boar semen has yet to be reported. The objective of the present study was therefore to evaluate the 24-day nonreturn rate (NR), farrowing rate (FR), number of total piglets born/litter (TB), and number of live born piglets/litter (BA) after IUI with FT boar semen in spontaneous and induced ovulating sows. Ejaculates collected from each of 6 boars [3 Landrace (L) and 3 Yorkshire (Y)] were cryopreserved separately and used to produce LY crossbred offspring. Each batch of qualifying FT semen (≥30% motility) was divided and used in both grou

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Iglesias, R. M. Rodriguez, C. Giglioli, N. Latimori, and H. Irazoqui. "Ovulation rate of Lincoln ewes at Bahia Blanca, Argentina." Animal Science 45, no. 3 (1987): 459–64. http://dx.doi.org/10.1017/s0003356100002944.

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ABSTRACTAn experiment was carried out at Bahia Blanca (38°44' S, 62°10' W) to estimate the seasonal variation in ovulation rate and its components shown by Lincoln ewes of constant live weight.Twenty-three 5-year-old ewes were subjected to nine 17-day observation periods which were evenly spaced within 405 days.Percentage of ewes showing oestrus and ovulation, incidence of multiple ovulations and ovulation rate were estimated for each period by using vasectomized rams and performing iaparoscopies.Traits showed a similar seasonality which was presumably induced by the natural light regime to wh

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Fogarty, NM, DG Hall, and AR Gilmour. "Performance of crossbred progeny of Trangie Fertility Merino and Booroola Merino rams and Poll Dorset ewes. 2. Reproductive activity, liveweight and wool production of ewe lambs." Australian Journal of Experimental Agriculture 35, no. 8 (1995): 1075. http://dx.doi.org/10.1071/ea9951075.

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Liveweight, wool production, oestrous expression and ovulation rates of 260 Trangie Fertility Merino x Dorset (TD) and 278 Booroola Merino x Dorset (BD) ewes born in late winter-spring over 4 different years were analysed from post-weaning to first joining at about 19 months of age. The percentage of ewes expressing oestrus reached a peak of 68% in May-June, declined to 7% in September and rose to 93% in January prior to first joining. The proportion of ewes ovulating followed a similar pattern. The proportion of ewes expressing oestrus in March, May and June increased (P<0.001) substantial

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Ferreira-Silva, José Carlos, Pábola Santos Nascimento, Marcelo Tigre Moura, et al. "Induction of Ovulation in Mangalarga Marchador Mares by hCG or GnRH." Acta Scientiae Veterinariae 46, no. 1 (2018): 6. http://dx.doi.org/10.22456/1679-9216.86667.

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Background: Induction of ovulation is a key procedure for horse assisted reproduction technologies, such as for artificial insemination (AI) and embryo transfer. The application of hCG remains as the primary ovulation-inducing agent for horse assisted reproduction, but alternatives are in demand to avoid its adverse effects, such as loss of ovulation-inducing efficiency over multiple applications by hCC-antibody production. Despite reports on alternative ovulation-inducing agents, pair-wise comparisons of such agents under similar conditions have been limited. Under such scenario, the work was

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Dawson, A., R. L. Pitt, S. J. Ward, M. J. Warren, N. D. Cameron, and A. R. Peters. "The effect of mating sows in the early oestrus period on duration and timing of ovulation." Proceedings of the British Society of Animal Science 1997 (1997): 81. http://dx.doi.org/10.1017/s1752756200595222.

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The duration of ovulation in pigs may contribute to embryo mortality, as later ovulated ova, which become the least mature embryos, are unable to contend with the changing uterine environment (Pope, 1992). The shorter ovulation of spontaneously ovulating sows, which were mated, compared to induced sows, which were not mated (Soede et al, 1992), suggested that the mating itself may reduce the length of ovulation. The current study determined the effect of mating in the early oestrus period on both the timing and duration in recendy weaned, spontaneously ovulating sows.

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Murtaza, A., M. I. R. Khan, W. Ahmad та ін. "118 A retrospective analysis of follicular dynamics, LH, estradiol-17β, and progesterone in prostaglandin F2α-induced estrus of Beetal goats". Reproduction, Fertility and Development 31, № 1 (2019): 185. http://dx.doi.org/10.1071/rdv31n1ab118.

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The objective of the study was to reveal the factors associated with variable interval to ovulation following a single dose of prostaglandin F2α (PGF2) in Beetal goats. In experiment 1, the extent of ovulation time was demonstrated after synchronizing Beetal goats (n=38) by using a single injection of PGF2 based on corpus luteum detection by B-mode transrectal ultrasonography. Ovulations were detected every 6h from PGF2 until ovulation. To explore the changes in follicular dynamics, endocrine profiles and behavioural events due to the variation in the interval to ovulation, another set of goat

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Hanrahan, J. P. "Divergent selection for ovulation rate in sheep : effect on embryo survival." Proceedings of the British Society of Animal Production (1972) 1992 (March 1992): 44. http://dx.doi.org/10.1017/s0308229600021681.

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The relative importance of genetic variation in ovulation rate and in embryo survival together with the genetic relationship between these traits are important issues in terms of manipulating prolificacy in all multitocous mammalian species. Evidence in sheep, primarily from study of breed differences but also based on results of selection for litter size, shows that genetic variation in litter size is essentially attributable to differences in ovulation rate although genetic differences in embryo survival have been identified. Results from selection on litter size also suggest that genetic va

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Glazko, V. I., J. B. Owen, I. Ap Dewi, and R. F. E. Axford. "An association of haemoglobin protein (HBB) with ovulation rate in Cambridge sheep." Animal Science 64, no. 2 (1997): 279–82. http://dx.doi.org/10.1017/s1357729800015848.

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AbstractBlood from 106 females (1 to 7 years old) of the Cambridge flock at the University of Wales, Bangor was analysed for 21 protein systems. Of the 11 polymorphic systems, haemoglobin protein (HBB) was found to be significantly associated with ovulation rate as measured by mean ovulation rate for all records per ewe. Mean ovulation rate for the HBB AA genotype was 1·25 ovulations higher than for the AB and BB genotypes (P < 0·001). The results suggest that a gene segregating in this breed is different from the Booroola (FecB) gene and that lambs of either sex can be screened at a young

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Pavlicev, Mihaela, Andreja Moset Zupan, Amanda Barry, et al. "An experimental test of the ovulatory homolog model of female orgasm." Proceedings of the National Academy of Sciences 116, no. 41 (2019): 20267–73. http://dx.doi.org/10.1073/pnas.1910295116.

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The ovulatory homolog model of female orgasm posits that the neuro-endocrine mechanisms underlying female orgasm evolved from and are homologous to the mechanisms mediating copulation-induced ovulation in some mammals. This model predicts that pharmacological agents that affect human orgasm, such as fluoxetine, should also affect ovulation in animals with copulation-induced ovulation, such as rabbits. We tested this prediction by treating rabbits with daily doses of fluoxetine for 2 wk and found that fluoxetine treatment reduces the number of ovulations postcopulation by 30%. In a second exper

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Kishida, K., T. Nishisouzu, S. Aoki, M. Iwata, O. Dochi, and H. Koyama. "337THE ONSET AND DURATION OF OVULATION IN DAIRY COWS SUPEROVULATED FOLLOWING SYNCHRONIZATION OF FOLLICLE WAVE WITH CIDR AND ESTRADIOL BENZOATE." Reproduction, Fertility and Development 16, no. 2 (2004): 288. http://dx.doi.org/10.1071/rdv16n1ab337.

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Determining the optimal time for AI of superovulated cattle is important for yielding acceptable fertilization rates. The objectives of this study were to determine the interval to onset, and the duration of ovulation in dairy cows superstimulated with FSH following synchronization of follicular wave emergence with a CIDR and estradiol benzoate (EB). Holstein (n=8) and Jersey (n=1) cows received an intravaginal progesterone insert (CIDR-B, InterAg, Hamilton, New Zealand) combined with an injection of 2mg EB at a random stage of the estrous cycle (Day 0). Superstimulatory treatments were initia

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Santos-Jimenez, Zurisaday, César A. Meza-Herrera, Guadalupe Calderon-Leyva, Paula Martinez-Ros, Juan M. Guillen-Muñoz, and Antonio Gonzalez-Bulnes. "Efficiency of hCG for Inducing Resumption of Ovarian Cyclicity and Synchronized Ovulations during the Seasonal Anestrous in Sheep." Animals 11, no. 11 (2021): 3159. http://dx.doi.org/10.3390/ani11113159.

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This research aimed to evaluate whether the administration of hCG at the time of removal of a progesterone device may be effective at inducing estrus and ovulations in sheep during the natural seasonal anestrous, by comparing reproductive outputs (induction and duration of estrus, follicle development, ovulation, ovulation rate, and pregnancy rates) in ewes treated with eCG or only saline solution at the time of CIDR removal. Whereas results demonstrated no response in the control non-treated group, the largest rate of narrowly synchronized estrus signs and ovulations occurred in the eCG-group

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Luque, A., T. N. Barry, W. C. McNabb, P. D. Kemp, and M. F. McDonald. "The effect of grazing Lotus corniculatus during late summer - autumn on reproductive efficiency and wool production in ewes." Australian Journal of Agricultural Research 51, no. 3 (2000): 385. http://dx.doi.org/10.1071/ar99078.

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A grazing experiment was conducted at Massey University (Palmerston North, New Zealand) over 80 days in the late summer–autumn of 1998 (9 February–29 April). Reproductive performance and wool growth of ewes grazing on Lotus corniculatus (birdsfoot trefoil) were compared with those of ewes grazing perennial ryegrass–white clover pasture. A rotational grazing system with 210 mixed-age dry ewes (59.80.9 kg/ewe) was used, with 80 ewes grazing pasture [1 g of condensed tannin (CT) per kg dry matter (DM)] and 130 ewes grazing L. corniculatus (24 g CT/kg DM). Half of the ewes grazing L. corniculatus

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Солодова, Е. В. "The effectiveness of mating of mares in the first heat after the foaling." Horse breeding and equestrian sports, no. 3 (June 20, 2022): 11–14. http://dx.doi.org/10.25727/hs.2022.3.60554.

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С целью определения целесообразности допуска кобыл к воспроизводству в первую охоту после выжеребки проведён анализ показателей зажеребляемости и эмбриональной смертности в зависимости от дня первой овуляции. Исследовано распределение послеродовых овуляций по дням и уровень повторяемости продолжительности периода до первой овуляции после смежных жерёбостей. В обработку вошли данные по 336 послеродовым овуляциям и 162 парам послеродовых овуляций, учтённых у 101 головы маток рысистых пород, содержащихся на двух конных заводах центральной России, в случных сезонах 2013-2016 и 2019-2022 годов. Уст

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KIRKWOOD, R. N., and P. A. THACKER. "FAILURE OF AN INDUCED OVULATION DURING LACTATION TO IMPROVE SOW OR LITTER PERFORMANCE." Canadian Journal of Animal Science 70, no. 1 (1990): 135–38. http://dx.doi.org/10.4141/cjas90-015.

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To test the effects of elevated blood progesterone on sow and litter performance, sixty-four, mixed parity Yorkshire × Landrace sows were allocated to be induced to ovulate during lactation (n = 34) or to serve as controls (n = 30). Ovulation was induced by an intramuscular injection of 1000 IU PMSG at 10 d and 500 IU hCG at 13 d of lactation. During lactation, sows were fed ad libitum a diet formulated to provide 13.1 MJ DE kg−1 and 16% crude protein while their feed intakes were recorded weekly. Piglets were weaned at 28–31 d of age. Of the 34 sows administered gonadotrophins, 19(56%) ovulat

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Shaaban, Mamdouh M., Kathy I. Kennedy, Gamal H. Sayed, Sharaf A. Ghaneimah, and Aly M. Abdel-Aleem. "The recovery of fertility during breast-feeding in Assiut, Egypt." Journal of Biosocial Science 22, no. 1 (1990): 19–32. http://dx.doi.org/10.1017/s0021932000018344.

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SummaryA longitudinal study of twenty-six breast-feeding and twelve non-breast-feeding postpartum women was conducted in Assiut, Egypt in order to determine the time that ovulation resumed after childbirth, and the effect of breast-feeding frequency on the period of lactational anovulation. Breastfeeding women experienced the onset of follicular development, vaginal bleeding, ovulation and pregnancy significantly later than women who did not breast-feed. Ovulatory and non-ovulatory breast-feeders reported similar frequencies of breast-feeding episodes. The introduction of dietary supplements c

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Ginther, O. J. "Selection of side of ovulation by intraovarianism in Bos taurus heifers†." Biology of Reproduction 103, no. 4 (2020): 711–16. http://dx.doi.org/10.1093/biolre/ioaa118.

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Abstract Intraovarianism refers to mechanisms within an ovary that affect the local follicle and luteal dynamics and is well-represented in heifers by greater frequency of ovulation from the right ovary (RO) than the left ovary (LO). On average, the RO has more 6-mm follicles than the LO before one follicle is selected to deviate in diameter and become the future ovulatory follicle. Therefore, the ovulatory follicle is more frequently selected from the RO. More follicles in the RO likely develop before birth as indicated by greater weight of the RO with more 0.3- to 4.8-mm follicles in recentl

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Thomas, GB, CM Oldham, RM Hoskinson, RJ Scaramuzzi, and GB Martin. "Effect of Immunization against Progesterone on Oestrus, Cycle Length, Ovulation Rate, Luteal Regression and LH Secretion in the Ewe." Australian Journal of Biological Sciences 40, no. 3 (1987): 307. http://dx.doi.org/10.1071/bi9870307.

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The effects of active immunization against progesterone on reproductive activity were studied in Merino ewes. Immunization against progesterone caused a shortening (P < 0'01) of the interval between ovulations from 17-18 days (controls) to between 6 and 10 days (immunized group); this was associated with a corresponding reduction in the interval between LH surges. The immunized ewes also had higher (P < O� 05) ovulation rates (1' 72) than controls (I. 25) and exhibited a reduced (P < 0'01) incidence of oestrus (26% v. 95%). Many immunized ewes continued to ovulate despite the persiste

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Targońska, Katarzyna, Dariusz Kucharczyk, Daniel Żarski, et al. "Artificial reproduction of wild and cultured barbel (Barbus barbus, Cyprinidae) under controlled conditions." Acta Veterinaria Hungarica 59, no. 3 (2011): 363–72. http://dx.doi.org/10.1556/avet.2011.021.

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The aim of this work was to compare the effects of controlled reproduction of cultured and wild common barbel, Barbus barbus (L.). Preparations containing different GnRH analogues and dopamine receptor antagonists (Ovopel, Ovaprim) as well as human chorionic gonadotropin (hCG) (in the case of cultured fish) were applied and their influence on ovulation, spermiation and quality of gametes obtained was determined. No differences in the qualitative or quantitative parameters of semen were found between fish stimulated with different hormonal preparations and those not receiving hormonal stimulati

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Failing, K., A. Wehrend, and S. Röskes. "Sonographische Darstellbarkeit des Corpus luteum bei der Milchkuh." Tierärztliche Praxis Ausgabe G: Großtiere / Nutztiere 40, no. 06 (2012): 367–73. http://dx.doi.org/10.1055/s-0038-1623138.

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Zusammenfassung Ziel der Untersuchungen war zu überprüfen, ab welchem Zeitpunkt post ovulationem das Corpus haemorrhagicum bei der Milchkuh nach spontaner oder induzierter Ovulation mit einem mobilen Ultraschallgerät sicher dargestellt werden kann. Material und Methoden: Während drei unbeeinflusster sowie drei durch die simultane Applikation von GnRH und PGF2α an den Zyklustagen 7, 14 oder 17 post ovulationem medikamentös verkürzter Zyklen wurde bei sechs Kühen die Ovardynamik dargestellt. Dazu erfolgte eine tägliche sonographische Untersuchung der Ovarien in den unbeeinflussten Zyklen ab dem

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King, Shelby M., Tyvette S. Hilliard, Lucia Y. Wu, Randal C. Jaffe, Asgerally T. Fazleabas, and Joanna E. Burdette. "The impact of ovulation on fallopian tube epithelial cells: evaluating three hypotheses connecting ovulation and serous ovarian cancer." Endocrine-Related Cancer 18, no. 5 (2011): 627–42. http://dx.doi.org/10.1530/erc-11-0107.

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Ovarian cancer is the most lethal gynecological malignancy affecting American women. Current hypotheses concerning the etiology of ovarian cancer propose that a reduction in the lifetime number of ovulations decreases ovarian cancer risk. Advanced serous carcinoma shares several biomarkers with fallopian tube epithelial cells, suggesting that some forms of ovarian carcinoma may originate in the fallopian tube. Currently, the impact of ovulation on the tubal epithelium is unknown. In CD1 mice, ovulation did not increase tubal epithelial cell (TEC) proliferation as measured by bromodeoxyuridine

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Silva, Otávia Reis, Marco Roberto Bourg de Mello, Lara Nogueira Silenciato, et al. "Comparison of estradiol benzoate and cypionate in Girolando cows submitted to a timed artificial insemination." Brazilian Journal of Veterinary Research and Animal Science 56, no. 3 (2019): e155078. http://dx.doi.org/10.11606/issn.1678-4456.bjvras.2019.155078.

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The various studies on the manipulation of the estrous cycle culminated in the development of estrous and ovulation synchronization protocols, to the point of defining an optimum moment for artificial insemination. The induction of ovulation is a primordial part for the determination of the moment of the TAI, so to study which hormones and how they behave allows a better understanding of this physiological process and, to manipulate it efficiently. The aim of the present study was to compare the use of estradiol benzoate (EB) and cypionate (ECP) as ovulation inducer in Girolando cows submitted

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Yoshioka, H., H. Matsuda, Y. Yamanouchi, Y. Aoki, K. Konishi, and K. Imai. "18 RELATIONSHIP BETWEEN MULTIPLE OVULATIONS AND CONCEPTION IN LACTATING DAIRY COWS." Reproduction, Fertility and Development 21, no. 1 (2009): 109. http://dx.doi.org/10.1071/rdv21n1ab18.

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The relationship between multiple ovulations and various factors involved in conception in lactating Holstein cows was investigated in this study. A total of 53 AI cows housed in a free-stall barn were assigned to this study. They were offered a balanced TMR ad libitum during the experimental period. Cows were milked at 0830 and 1900 h. Milk yields were recorded at each milking. Estrus was detected by radiotelemetric pedometers (Yoshioka et al. 2007 Reprod. Fertil. Dev. 19, 129). The body condition score (BCS) of cows was recorded at estrus. Artificial insemination was performed according to t

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Khaiseb, P. Clemens, Penelope A. R. Hawken, and Graeme B. Martin. "Interactions between Nutrition and the “Ram Effect” in the Control of Ovarian Function in the Merino Ewe." Animals 12, no. 3 (2022): 362. http://dx.doi.org/10.3390/ani12030362.

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We tested whether short-term nutritional supplementation (500 g lupin grain per head daily) would affect the response of ewes to the ram effect. Experiment 1 (end of non-breeding season): ewes were supplemented for either Days −6 to −1 relative to ram introduction (n = 24) or for 12 days after ram introduction (Days 11 to 22 of the ram-induced cycle; n = 29). Controls (n = 30) were not supplemented. Across all groups, 94–100% of ewes ovulated. Supplementation before ram introduction did not affect ovulation rate at the ram-induced ovulation but increased it during the ram-induced cycle (Contro

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Dupuis, Lisa, Yasmin Schuermann, Tamara Cohen, et al. "Role of leptin receptors in granulosa cells during ovulation." REPRODUCTION 147, no. 2 (2014): 221–29. http://dx.doi.org/10.1530/rep-13-0356.

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Leptin is an important hormone influencing reproductive function. However, the mechanisms underpinning the role of leptin in the regulation of reproduction remain to be completely deciphered. In this study, our objective is to understand the mechanisms regulating the expression of leptin receptor (Lepr) and its role in ovarian granulosa cells during ovulation. First, granulosa cells were collected from superovulated mice to profile mRNA expression of Lepr isoforms (LeprA and LeprB) throughout follicular development. Expression of LeprA and LeprB was dramatically induced in the granulosa cells

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Zambrini, F. N., E. P. Costa, J. H. Bruschi, J. M. G. Souza, L. S. Amorim, and J. F. Fonseca. "449 EFFECTS OF HORMONAL ADMINISTRATION IN TWO DIFFERENT SHIFTS AND OVULATORY DYNAMICS IN NONBREEDING SEASON ON TOGGENBURG GOATS." Reproduction, Fertility and Development 22, no. 1 (2010): 381. http://dx.doi.org/10.1071/rdv22n1ab449.

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Assisted reproduction has been used to optimize reproduction in goats. Ultrasound technology has resulted in a definite gain of knowledge in terms of ovulation time. The aim of this study was to evaluate if the shift (morning or afternoon) of hormonal administration affects different reproductive parameters. This study was conducted from October to December (nonbreeding season) of 2005, in Piau/MG (21°35′S latitude and 43° 15′W longitude), Brazil. Eighteen nulliparous (n = 9) or pluriparous (n = 9) Toggenburg goats were assigned equally according to body weight and condition score into two tre

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Duggal, Priya S., Kylie H. Van der Hoek, Clyde R. Milner, et al. "The in Vivo and in Vitro Effects of Exogenous Leptin on Ovulation in the Rat*." Endocrinology 141, no. 6 (2000): 1971–76. http://dx.doi.org/10.1210/endo.141.6.7509.

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Abstract Leptin, a hormonal product of the Lep gene, is expressed by adipocytes and is thought to play a role in regulating food intake and reproduction. The leptin protein has been localized in many reproductive tissues, including the ovary. Several publications indicate that the ovary is directly affected by leptin and that leptin may be a factor linking obesity and reproductive dysfunction. In this study, the effect of systemic leptin administration on ovulation in the rat ovary, both in vivo and in vitro, was investigated. Ip administration of leptin (30 μg at 3 hourly intervals for 15 h)

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Senatore, E. M., W. R. Butler, and P. A. Oltenacu. "Relationships between energy balance and post-partum ovarian activity and fertility in first lactation dairy cows." Animal Science 62, no. 1 (1996): 17–23. http://dx.doi.org/10.1017/s1357729800014260.

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AbstractForty primiparous Holstein dairy cows were monitored from calving through 100 days in milk to evaluate the effect of energy balance in the early post-partum period on subsequent fertility. The post-partum interval to first ovulation (R2 = 0·41; P < 0·005) was lengthened by greater negative energy balance, and reduced by greater body weight at parturition or decreased body-weight loss during the experimental period. Luteal activity (R2 = 0·58; P < 0·0001), measured by plasma progesterone area under curve, was increased in the first cycle post partum by a shorter interval to first

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Li, Tao, Xuehua Ren, Tianjiao Li, et al. "Low-Dose Sodium Salicylate Promotes Ovulation by Regulating Steroids via CYP17A1." International Journal of Molecular Sciences 24, no. 3 (2023): 2579. http://dx.doi.org/10.3390/ijms24032579.

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To meet the current demand of assisted reproduction and animal breeding via superovulation and reduce the impact of hormone drugs, it is necessary to develop new superovulation drugs. This study examined the role of inflammation and steroids in ovulation. Sodium salicylate can regulate inflammation and steroids. However, the effect of sodium salicylate on ovulation has not been studied. In this study, mice were intraperitoneally injected with different concentrations of sodium salicylate for four consecutive days. The effects of sodium salicylate on oocyte quality and on the number of ovulatio

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Relton, C. E., N. C. Bennett, and K. Medger. "The mode of ovulation in the Namaqua rock mouse, Micaelamys namaquensis." Canadian Journal of Zoology 91, no. 11 (2013): 829–36. http://dx.doi.org/10.1139/cjz-2013-0145.

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The pattern of ovulation in mammals is generally considered to be either spontaneous or induced by copulation, with environmental and social factors playing a key role in determining the specific mode of ovulation that would maximize the reproductive potential of the species. This study aims to determine whether the Namaqua rock mouse (Micaelamys namaquensis (A. Smith, 1834)) is a spontaneous or induced ovulator. Females were divided into three treatments differing in the degree of contact with a male. Namely, seven control females had no contact with a male; a further seven separated females

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Panigrahi, Madhuri, and Santosh K. Panda. "Effect of ovulation on serum cholesterol in women of reproductive age group." International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7, no. 2 (2018): 424. http://dx.doi.org/10.18203/2320-1770.ijrcog20180036.

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Background: Reproduction and contraception is mostly central around ovulation. The sex hormones undergo changes in levels with ovulation. They also play an important role in cholesterol metabolism, especially oestrogen. Aim of our study was to find out changes in serum cholesterol before and after ovulation in women of reproductive age.Methods: In present study 70 women of reproductive age group (15-49years) were recruited. Serum cholesterol was measured around time of ovulation.Results: It was found that, during the follicular phase there was a significant increase in total cholesterol and LD

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Gillis, D. J., B. A. McKeown, and D. E. Hay. "Physiological and Histological Aspects of Late Oocyte Provisioning, Ovulation, and Fertilization in Pacific Herring (Clupea harengus pallasi)." Canadian Journal of Fisheries and Aquatic Sciences 47, no. 8 (1990): 1505–12. http://dx.doi.org/10.1139/f90-168.

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Late vitellogenic, ovulating, and ovulated Pacific herring oocytes were examined histologically and histochemically in order to understand these fine-scale processes and to evaluate egg maturation timing test criteria for use in resource management. Late vitellogenic events were investigated using an alkali-labile protein phosphorus (ALPP) assay of serum, liver, and gonad tissue. Serum levels were constant in males but declined in females. Ovarian levels declined (110 to 15 mg/L) during ovulation. Hepato-somatic indices were constant in males but declined in females (1.6 to 0.9%) during ovulat

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Horáčková, Eliška, Miroslava Mráčková, Michal Vyvial, Šárka Krisová та Markéta Sedlinská. "The effect of hCG, GnRH and PGF2α analogue cloprostenol on the oestrus cycle in jennies". Acta Veterinaria Brno 88, № 3 (2019): 271–75. http://dx.doi.org/10.2754/avb201988030271.

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The objectives of this study were twofold. Firstly, the present study was designed to examine susceptibility of the corpus luteum (CL) in early diestrus in jennies; and secondly, to investigate the effect of two commonly used hormonal agents in horses on the induction of ovulation in jennies. The oestrus cycles of eleven jennies were monitored by ultrasound every day. When the dominant follicle reached a diameter of 30 mm, the jennies were treated by intramuscular administration of gonadotropin-releasing hormone agonist lecirelin (GnRH, 50 µg pro toto) in the first oestrus cycle, and human cho

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Fitzgerald, Barry P., Steven L. Meyer, Karen J. Affleck, and Pamela J. Silvia. "Effect of constant administration of a gonadotropin-releasing hormone agonist on reproductive activity in mares: Induction of ovulation during seasonal anestrus." American Journal of Veterinary Research 54, no. 10 (1993): 1735–45. http://dx.doi.org/10.2460/ajvr.1993.54.10.1735.

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Summary The potential of a gonadotropin-releasing hormone (GnRH) agonist (goserelin acetate), delivered constantly for 28 days via a subcutaneous depot, to induce ovulation in seasonally anestrous mares, was investigated. Two experiments were conducted, in which a range of doses (30 to 240 µg/mare/d) was examined. Mares were selected on the basis of lack of substantial follicular development (follicle diameter < 20 mm determined ultrasonically) and low serum concentrations of luteinizing hormone (lh) and progesterone. Constant administration of the GnRH agonist-induced ovulation in anestrou

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Pinna, A. E., F. Z. Brandão, A. S. Cavalcanti, A. M. Borges, J. M. G. Souza, and J. F. Fonseca. "Reproductive parameters of Santa Inês ewes submitted to short-term treatment with re-used progesterone devices." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 64, no. 2 (2012): 333–40. http://dx.doi.org/10.1590/s0102-09352012000200012.

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The aim of this study was to verify the efficacy of reusing intravaginal progesterone (P4) devices on the reproductive parameters in Santa Inês ewes. Females received intravaginal P4 devices for their first, second or third use for five days plus 300 IU eCG IM and 5mg dinoprost laterovulvar 24h before device removal. Blood was collected at different moments. Transrectal ultrasonography was performed from device removal to ovulation. Part of the ewes were submitted to artificial insemination by laparoscopy (IAL - n=55) with fresh semen, whereas the rest were bred by fertile rams (n=41). On the

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Oliveira, Maria Emilia Franco, Mabel Freitas Cordeiro, Roberta Machado Ferreira, et al. "Does supplemental LH changes rate and time to ovulation and embryo yield in Santa Ines ewes treated for superovulation with FSH plus eCG?" Ciência Rural 42, no. 6 (2012): 1077–82. http://dx.doi.org/10.1590/s0103-84782012000600021.

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The objective was to evaluate if supplemental LH given at the end of FSH treatment would synchronize the time of ovulation and increase the ovulation rate and embryo yield in Santa Ines ewes. Twenty superovulatory (SOV) programs were accomplished in cross-over design (60d interval). On D0, a CIDR device was inserted, and the device was replaced with a new one 7 days later, when 37.5µg of d-cloprostenol was administered. On D12, we started the SOV treatment, administering 256mg of pFSH 8 times, 12h apart. On D14, the CIDR was removed, and 200IU of eCG and 37.5µg of d-cloprostenol were administe

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Palhao, M. P., M. A. Beg, M. T. Rodrigues, et al. "219 FOLLICLE AND HORMONE DYNAMICS IN SINGLE- v. DOUBLE-OVULATING HEIFERS." Reproduction, Fertility and Development 22, no. 1 (2010): 267. http://dx.doi.org/10.1071/rdv22n1ab219.

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The present experiment used the Day 4 ablation model for increasing the incidence of double ovulations in heifers. The objective was to compare follicle growth and plasma hormone concentrations associated with single v. double ovulations. Follicles ≥5 mm were ablated at 4 days post-ovulation to induce a prominent FSH surge and a new follicular wave, and 2 injections of PGF2 (12 h apart) were given 2 days later (Day 6) to favor ovulation. Beginning on Day 5, the 3 largest follicles of the induced wave were scanned twice a day until 36 h after the next ovulation. Blood samples were taken at 6-h

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Menkhorst, E., N. Ezard, and L. Selwood. "Induction of ovulation and natural oestrous cycling in the Stripe-faced Dunnart, Sminthopsis macroura." Reproduction 133, no. 2 (2007): 495–502. http://dx.doi.org/10.1530/rep-06-0254.

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Induced ovulation allows reproduction by otherwise infertile females, and is ideal for the captive breeding of endangered species where the population is aged or breeding is unsuccessful. A predictable time of ovulation after induction has not yet been achieved in polyovular marsupials. Ovulation was induced in Sminthopsis macroura using an initial injection of 20 IU equine serum gonadotrophin (eSG; Day 0), followed on Day 4 by either 20 IU eSG (n = 25) or 0.5 mg porcine luteinizing hormone (n = 26). I.p. hormone injection was given in the morning or early evening, and reproductive status was

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Regan, Sheena L. P., James R. McFarlane, Tim O'Shea, et al. "Flow cytometric analysis of FSHR, BMRR1B, LHR and apoptosis in granulosa cells and ovulation rate in merino sheep." REPRODUCTION 150, no. 2 (2015): 151–63. http://dx.doi.org/10.1530/rep-14-0581.

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The aim of the present study was to determine the direct cause of the mutation-induced, increased ovulation rate in Booroola Merino (BB) sheep. Granulosa cells were removed from antral follicles before ovulation and post-ovulation from BB (n=5) and WT (n=12) Merino ewes. Direct immunofluorescence measurement of mature cell surface receptors using flow cytometry demonstrated a significant up-regulation of FSH receptor (FSHR), transforming growth factor beta type 1, bone morphogenetic protein receptor (BMPR1B), and LH receptor (LHR) in BB sheep. The increased density of FSHR and LHR provide nove

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Sharma, Akshay, Madhumeet Singh, Pravesh Kumar, and Pradeep Kumar Dogra. "Investigating Post-partum Ovarian Cyclicity Following Various Treatments in Dairy Cows." Rural Sustainability Research 41, no. 336 (2019): 22–25. http://dx.doi.org/10.2478/plua-2019-0004.

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Abstract The present study envisages the effect of PGF2α and antibiotic treatment on ovarian cyclic activity and regression of corpus luteum verum in post-partum dairy cows. Cows were divided into three treatment (PG8, PG25, antibiotic) and a control group. Ovarian activity was studied by examining follicular dynamics upto 42 days post-partum in which diameter of dominant follicle before first ovulation, the number of days to first ovulation and complete regression of corpus luteum verum were evaluated. Body condition score was recorded for all the cows in different groups. Also, ovulation on

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Thompson, C. L., P. L. Whitten, and M. A. Norconk. "Can male white-faced saki monkeys (Pithecia pithecia) detect female reproductive state?" Behaviour 148, no. 11-13 (2011): 1310–28. http://dx.doi.org/10.1163/000579511x605227.

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Abstract For mammalian males, copulating with females during ovulation is critical to reproductive success. However male knowledge of ovulation may not always be advantageous for females, as it could hinder mate choice or promote harassment. White-faced saki monkeys live in variably monogamous and polygamous social groups and hence females may have multiple motivations to conceal ovulatory timing. White-faced sakis further show no obvious physical or behavioral signs of ovulation, although they do use scent in a variety of contexts, including sexual behavior. We collected data on three wild gr

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Presicce, G. A., G. De Santis, and E. M. Senatore. "227OVARIAN FOLLICULAR DYNAMICS IN POSTPARTUM MEDITERRANEAN ITALIAN BUFFALOES." Reproduction, Fertility and Development 16, no. 2 (2004): 235. http://dx.doi.org/10.1071/rdv16n1ab227.

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In cattle and buffaloes resumption of ovarian activity, as expressed by first post partum ovulation and follicle turnover leading to periodic estrus cycles and ovulations, can be affected by many factors among which uterine infections and dietary supplementation play a leading role. In addition, buffaloes are considered seasonal animals characterized by a tendency to reproduce in correspondence to a decrease of day length. This aspect may further affect their reproductive efficiency by delaying or interrupting ovarian activity if calving occurs in transitional (i.e., from end winter into begin

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Pennington, P. M., L. R. Gentry, C. E. Pope, et al. "164 CHARACTERIZATION OF THE COMMON ELAND (TAUROTRAGUS ORYX) ESTROUS CYCLE." Reproduction, Fertility and Development 21, no. 1 (2009): 181. http://dx.doi.org/10.1071/rdv21n1ab164.

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Three species of Tragelaphine (spiral horned) antelopes are endangered including the Eastern Bongo. Though most antelope species are represented as captive herds, a detailed characterization of their estrous cycles has not been described. In a crossover experimental design utilizing two groups of four females (n = 8), two estrus synchronization treatments were applied to each female. The treatments were: 1) PGF2∝ (Lutalyse®, 25 mg IM) repeated 11 days later and 2) administration of a progestin (altrenogest, 5 mL, 2.2% p.o.) for 7 days followed by PGF2∝ (25 mg IM) on 7th day. Blood samples were

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Ahmad, W., M. I. R. Khan, A. Murtaza, I. Mohsin, A. Riaz, and K. Javed. "121 Ovulatory response to gonadotropin-releasing hormone relative to day and diameter of dominant follicle during the first follicular wave in Beetal goats." Reproduction, Fertility and Development 31, no. 1 (2019): 186. http://dx.doi.org/10.1071/rdv31n1ab121.

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In Beetal goats under subtropical conditions, ovulatory response of first-wave dominant follicle based on diameter and day of oestrous cycle is unknown to date. The objective of this study was to evaluate the ovulatory response to gonadotropin-releasing hormone (GnRH) relative to day and diameter of dominant follicle during the first follicular wave in Beetal goats. Fifty goats were synchronized using a single dose of prostaglandin F2α (75 µg; D+ cloprostenol, Fatro, Italy), and scanned every 6 hours for ovulation using a 7.5-MHz trans-rectal transducer (Honda HS: 1500, Japan). Following ovula

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Bonin, B. F., J. A. Dellaqua Jr, and M. A. Alvarenga. "165 OVARIAN RESPONSE AND EMBRYO RECOVERY RATES OF OLD MARES TREATED WITH A LOW DOSE OF EQUINE PITUITARY EXTRACT." Reproduction, Fertility and Development 22, no. 1 (2010): 241. http://dx.doi.org/10.1071/rdv22n1ab165.

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Mares older than 15 years have low embryo recovery rates, mostly because of disturbances in follicle or oocyte maturation and early embryonic development. A recent publication showed that circulating LH level is lower in older mares (Ginther et al. 2009 Theriogenology 5, 780-788). Equine pituitary extract (EPE) is rich in LH and consequently is able to increase circulating LH levels after injection into mares. The present study aimed to evaluate the effect of low doses of EPE on follicular growth, ovulation rate, and embryo recovery rates in older mares. Embryo donors (n = 20) were Quarter Hor

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Glazier, A. M., and F. C. Molinia. "Development of a porcine follicle-stimulating hormone and porcine luteinizing hormone induced ovulation protocol in the seasonally anoestrus brushtail possum (Trichosurus vulpecula)." Reproduction, Fertility and Development 14, no. 8 (2002): 453. http://dx.doi.org/10.1071/rd02045.

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Monovulatory brushtail possums (Trichosurus vulpecula) were stimulated with exogenous hormones during seasonal anoestrus to overcome ovarian insensitivity and induce ovulation. Seasonal ovarian insensitivity to pregnant mare serum gonadotrophin (PMSG) was overcome by a new porcine follicle-stimulating hormone/porcine luteinizing hormone (pFSH/pLH) protocol. This protocol was refined because the original treatment produced oocytes with abnormal morphology. Possums (n = 12 per group) received eight injections of pFSH of 1.5, 3.0 or 6.0 mg per injection (at 12-h intervals for 4 consecutive days).

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Patel, Dhaval K., and Darshit G. Prajapati. "Study the accuracy of salivary ferning test as a predictor of ovulation." International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7, no. 7 (2018): 2699. http://dx.doi.org/10.18203/2320-1770.ijrcog20182866.

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Background: Women probably spent much of their adult life avoiding getting pregnant but when they are actively trying for a baby, it may be taking a little longer time than they hoped. So it is important for the women to know when they are ovulating. Recently, a small hand held microscope (KNOWHEN ovulation microscope) has been developed for the purpose of self-observing ferning patterns in saliva during female fertile period. The purpose of our study is to evaluate the accuracy of salivary ferning test by KNOWHEN ovulation microscope to predict the ovulation and to detect sensitivity and spec

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Kusumaningrum, D. A., R. S. Sianturi, F. A. Pamungkas, and E. Wina. "The effectiveness of prostaglandin nanoparticles in corpus luteum regression." IOP Conference Series: Earth and Environmental Science 888, no. 1 (2021): 012005. http://dx.doi.org/10.1088/1755-1315/888/1/012005.

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Abstract Research examined the formation of prostaglandin nanoparticles and their effect on corpus luteum (CL) regression carried out at IRIAP. The nanoparticles formation was carried out using the ionic gelation method. The nanoparticles have a particle size of 316.80±0.14 nm, polydispersion index of 0,453±0,001, zeta potential of +17,40±0,85 mV with 69,69±8.81% hormone entrapment. The effectiveness of nanoparticle in CL regression was observed (prostaglandin vs prostaglandin nanoparticles) using ultrasound observation, hormone profile and estrus response. Further, the size of the ovulating f

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