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Relevant bibliographies by topics / Cattle Ovaries

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Academic literature on the topic 'Cattle Ovaries'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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Journal articles on the topic "Cattle Ovaries"

1

Borges, Á. M., C. H. Santana, and R. L. Santos. "Squamous metaplasia of the rete ovarii do not suppress ovarian cyclicity and pregnancy in cattle: case report." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 73, no. 3 (May 2021): 653–57. http://dx.doi.org/10.1590/1678-4162-12221.

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ABSTRACT Squamous metaplasia of the rete ovarii is an ovarian pathologic change characterized by replacement of the normal single layered cuboidal epithelium of the rete ovarii by a stratified squamous keratinized epithelium. Uterus and ovaries from a local slaughterhouse pregnant crossbreed cow were evaluated through ultrasound, macroscopically and histologically. Grossly, there were multiple cysts in both ovaries, which were histologically characterized as rete ovarii cysts with squamous metaplasia and intraluminal accumulation of keratinized material. Squamous metaplasia of the rete ovarii has been previously reported in cows, however this is the first report of this condition in a pregnant animal, demonstrating that this ovarian change is compatible with pregnancy.

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2

Sonjaya, Herry, M. Yusuf, A. Hamdana, Renny Fatmyah Utamy, Sri Gustina, and Hasbi Hasbi. "Effect of Bali cattle ovarian status on oocytes nuclear maturation and in vitro fertilization rate." Jurnal Ilmu Ternak dan Veteriner 22, no. 4 (March 5, 2018): 173. http://dx.doi.org/10.14334/jitv.v22i4.1585.

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<p>The aim of this study was to investigate whether the reproductive status influences the nuclear maturation and fertilization rates of bali cattle oocytes in vitro. Several pairs of ovary were classified into four groups: 1) ovaries with Corpus Luteum (CL) and Dominant Follicle (DF), 2) ovaries without CL and with DF, 3) ovaries with CL and without DF, 4) ovaries without both CL and DF. In the first experiment, oocytes were collected by slicing method in Phosphate Buffer Saline (PBS) medium supplemented with 10% Fetal Bovine Serum (FBS) and 100 IU/ml penicillin streptomycin. Oocytes were matured in tissue culture medium (TCM)-199 supplemented with 10% Fetal Bovine Serum (FBS), 10 IU/ml Follicle Stimulating Hormone (FSH), 10 IU/ml Luteinizing Hormone (LH), and 50 μg/ml gentamycin. Oocytes were matured in 5% CO2 incubator, 38oC for 24 h. In the second experiment, oocytes were matured and then fertilized in vitro to observe pronuclear formation. The first experiment showed that the percentage of oocytes reached methaphase-II (MII) stage on ovaries with CL and without DF (89.47%) were higher (P<0,01) compared to ovaries without both CL and DF (75,47%), ovaries without CL and with DF (74.,41%), or ovaries with CL and DF (65,52%). The result of second experiment showed that the ovarian reproductive status was not significantly different (P>0.05) on fertilization rate.</p>

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3

SHIOYA, Yasuo, and Akira HANADA. "Superovulation of cattle bearing cystic ovaries." Japanese journal of animal reproduction 31, no. 2 (1985): 93–94. http://dx.doi.org/10.1262/jrd1977.31.93.

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4

Ozdas, O. B., M. Tas, U. Cirit, M. Evecen, K. Demir, S. Bacinoglu, K. Ak, and I. K. Ileri. "291 EFFECT OF DIFFERENT TRANSPORT TEMPERATURES (+4°C, +32°C) ON IN VITRO MATURATION OF OOCYTES COLLECTED FROM CATTLE AND SHEEP OVARIES." Reproduction, Fertility and Development 17, no. 2 (2005): 296. http://dx.doi.org/10.1071/rdv17n2ab291.

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At present, blastocyst rates in embryos obtained from in vitro maturation of oocytes, and their fertilization and culture, is still not at the desired level. One of the most important problems encountered in in vitro culture studies is seen in the maturation period of oocytes until they reach the fertilizable level. Transport time of the ovaries and, in particular, temperature of the transport medium used are among the factors affecting complete maturation. The aim of this study was to determine the effects of different transport temperatures (4°C, 32°C) of sheep and cattle ovaries on the in vitro maturation of oocytes. Two experimental groups were formed in the study. Sheep and cattle ovaries were put into saline solution at 32°C. The ovaries were transported at the same temperature (Group I) or at 4°C following a 10-min incubation at room temperature (Group II), in 2–4 h to the laboratory (n = 6). For each group, oocytes were collected from ovaries using the dissection method and selected oocytes were matured in their own group in 700 μL TCM-199 (supplemented with pyruvate, LH, FCS) for 23 h at a gas atmosphere of 5% CO2, 5% O2, 90% N2 and at 38.8°C. At the end of maturation, oocytes were cleansed from their cumulus oophorus cells and fixed in acetic acid-ethyl alcohol (1:3) for 48 h. The developmental stages until MII of oocytes stained with aceto-orcein were then examined under the phase contrast microscope. The chi-square test was used for statistical analysis (Table 1). While oocytes obtained from sheep ovaries transported at +32°C reached the MII stage at a faster rate compared to those at +4°C (P < 0.001), no statistically significant difference was observed between the maturation to the MII stage of oocytes obtained from cattle ovaries transported at +4°C and +32°C. As a result of this study, while it was established that cattle ovaries could be transported at both +4°C and +32°C and that there was no difference in oocyte maturation, a medium temperature of +4°C was determined to be unsuitable for transporting sheep ovaries. Table 1. Stages of development in sheep and cattle oocytes after 23 h of culture This work was supported by Istanbul University.

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5

El-Sayed, G., Mohamed El-Diasty, and Hadeer Magdy. "Effect of progesterone on some reproductive performances in cattle." Mansoura Veterinary Medical Journal 20, no. 2 (June 25, 2019): 86–91. http://dx.doi.org/10.35943/mvmj.2019.22.109.

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Our experiment was conducted at a special dairy farm in Dakahlia Governorate between the periods (March –May 2018), This farm consisted of 400 Holestien cows; from the total of the animals only 210 lactating cows. The established experiment applied on 40 cows suffered from different types of anestrum detected by ultrasonography as follow (15 cows suffer from cystic ovary, 15 cows suffer from smooth inactive ovaries and 10 cows suffer from persist corpus luteum to study the effect of progesterone device insertion in dairy cattle and its effect in fertility. On day 0, cattle at random stage of estrous cycle received controlled internal drug release vaginal insert (CIDR).We left the CIDR in the vagina for seven days as we inject PGF2 on day 6 and remove the CIDR on day 7, blood samples were collected from 25 animals at zero day, 3rd, 7th and 9th day from the tail vein, and then we follow the estrous and detected the estrus cow for AI and apply ultrasonography for pregnancy diagnosis after 30 day from insemination From this study it was concluded that the use of progesterone for 7 days +i.m. injection of PGF2α in the 7th day can applied to dairy cattle to restart ovarian activity and it is an effective treatment for different infertility cases like cystic ovarian disease, persist corpus luteum and smooth in active ovaries. Moreover present study provides evidence for the importance of prior exposure to progesterone for cows to express estrous behavior, increase number of pregnant animals and increase conception rate.

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6

Priyo Jr, Topas Wicaksono, Agung Budiyanto, and Asmarani Kusumawati. "Pengaruh Ukuran Ovarium dan Folikel Terhadap Penampilan Reproduksi pada Sapi Po dan Simpo di Kecamatan Jatinom, Kabupaten Klaten." Jurnal Sain Veteriner 38, no. 1 (April 1, 2020): 20. http://dx.doi.org/10.22146/jsv.43960.

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The increasing beef cattle population in Indonesia is not significantly with high demand of meat every year. The insignificant increasing in population is caused by fertility decreasing, infectious disease and the reduction amount of forage land. The factor which causes cattle fertility decreasing can’t be separated from the ovarian and follicular diameter which have an effect on high various reproductive appearance. Parameters that use for knowing reproductive appearance of cattle are Service per Conception (S/C) and Calving Interval (CI). The aims of this study is to describe ovary sizes and follicular diameter in cattle, to describe ovary and follicular diameter toward S/C and CI variation. This research uses female cattle, 8 SimmentalPO (SimPO) and 9 Ongole breeds (PO), multiparous, are not pregnant, 4-8 years old, Body Condition Score (BCS) 2.5-3.5, peak phase estrus, has no reproductive problems, clear recordings and live in the area of farmer in Jatinom District, Klaten Regency, Central Java Province. Cattle are examined for ovarian size and follicle size using ultrasonography. S/C and CI data were obtained from records of artificial insemination cards (AI). The data obtained were analyzed by t test. The results of this study showed there were no differences in the diameter of ovaries in the size of SimPO and PO cattle (P> 0.05), there were no differences in the diameter of SimPO and PO cattle follicles (> 0.05), there were differences in ovarian and follicular diameter sizes with respect to S/C and CI in cattle with good and bad reproductive performance (P <0.05). The conclusion of the study showed that there was no difference in ovarian and follicular diameter size in SimPO and PO cattle (P> 0.05) but there was an influence on S/C and CI (P <0.05).

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Liamanu, Sukardi, Lentji Rinny Ngangi, Santie H. Turangan, and Jouke H. Manopo. "RESPON OVARIUM SAPI LIMOUSIN DAN SIMMENTAL TERHADAP INDUKSI FOLLICLE STIMULATING HORMONE." ZOOTEC 38, no. 2 (October 22, 2018): 396. http://dx.doi.org/10.35792/zot.38.2.2018.21262.

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OVARIUM RESPONSE OF LIMOUSIN COWS AND SIMMENTAL COWS ON FOLLICLE STIMULATING HORMONE INDUCTION. To assess the effect of FSH administration on ovarian response rates. and to examine the effect of synchronizing follicular waves on ovarian response rates and the acquisition of embryos that are worthy of transfer. This research was carried out at the Laboratory of Embryo Production of Livestock Embryo Hall Cipelang Cijeruk district, Bogor regency, for 30 days. The materials used in this research were 50 cattle consisting of 25 female Limousin cows and 25 Simmental female cows at the aged around 5-7 years. They have given birth, and have been superovulated, at the body condition score (BCS) of 2.5-3.0, at the healthy and given forage and concentrate (BET protocol). FSH used was the Folltropin®-V brand superovulation with a dose of 20 mg / ml, the cement used was in accordance with the type of donor cow, with a concentration of 25 x 106 spermatozoa per straw. Primary data retrieval were done by observing the focal animal sampling technique requiring direct observation in the research location where the research material was located. The variables measured were response rate, number of corpus luteum (CL) in the left and right ovaries, the total collected embryos and ovum. Superovulation using Folltropin®-V in Simmental and Limousin cattle at Cipelang Livestock Embryo gave more significantly effect on Simmental cattle compared to Limousin cattle. Limousin and Simmental cattle supplemented with the hormone Folltropin®-V produced an average number of CL, embryos and ovum in Simmental cattle higher than Limousin cattle superovulated with FSH hormone. They have also a significant effect on the response rate, recovery rate, average CL number and the average number of embryos. The results obtained showed that Limousin and Simmental cattle differences significantly affected the number of collected embryos and ovum, the proportion of transferable embryos, Degenerate (Dg) embryo proportions and unfertilized proportion of Embryo Unfertilized (UF).Keywords: Limousin cows, Simmental cows, Superovulasi, FSH

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8

Ireland, J. J., G. W. Smith, D. Scheetz, F. Jimenez-Krassel, J. K. Folger, J. L. H. Ireland, F. Mossa, P. Lonergan, and A. C. O. Evans. "Does size matter in females? An overview of the impact of the high variation in the ovarian reserve on ovarian function and fertility, utility of anti-Müllerian hormone as a diagnostic marker for fertility and causes of variation in the ovarian reserve in cattle." Reproduction, Fertility and Development 23, no. 1 (2011): 1. http://dx.doi.org/10.1071/rd10226.

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The mechanism whereby the inherently high variation in ovary size and the total number of high-quality oocytes in ovaries (ovarian reserve) impact on ovarian function and fertility, diagnostics to measure the size of the ovarian reserve and the factors that cause variation in the ovarian reserve are unknown. Our results show that cattle can be phenotyped reliably based on the number of antral follicles growing during follicular waves (antral follicle count, AFC). Young adult cattle with a consistently low v. a high AFC have smaller gonads, a markedly diminished ovarian reserve and many other phenotypic characteristics usually associated with ovarian aging and infertility. A powerful new approach based on a single measurement of serum concentration of anti-Müllerian hormone (AMH) is described to test the longstanding hypothesis that the size of the ovarian reserve is positively associated with fertility. Also, new evidence shows that maternal environment has a critical role in regulation of the high variation in the ovarian reserve and perhaps fertility in offspring. These results support the conclusion that the inherently high variation in the ovarian reserve, potentially caused by alterations in the maternal environment, has a negative impact on ovarian function that may result in suboptimal fertility in young adult cattle, and a single AMH measurement can be used reliably in future studies to determine if fertility is suboptimal in young adult cattle with low circulating AMH concentrations and a correspondingly diminished ovarian reserve.

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Tachibana, C., S. Kabeya, A. H. Sugulle, H. Koyama, J. Singh, and O. Dochi. "316 EFFECT OF ULTRASOUND TRANSDUCER FREQUENCY ON FOLLICLE IDENTIFICATION ACCURACY IN CATTLE." Reproduction, Fertility and Development 21, no. 1 (2009): 255. http://dx.doi.org/10.1071/rdv21n1ab316.

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Ultrasoundsonography (US) is an essential tool for the study of reproductive physiology and is particularly useful in research on ovarian follicular dynamics in cattle. The resolution of the US images obtained, however, differs according to the frequency of the transducer used. The objective of this study was to investigate the effect of transducer frequency on the accuracy of follicle identification in cattle. A Honda HS-2000 sonograph equipped with 5.0, 7.5, and 10.0 MHz of B-mode linear rectal transducers was used in this study. A total of 22 ovaries with corpus luteum were collected from a local slaughterhouse. Each ovary was fixed on a paraffin block, immersed in de-gassed water, the transducer was placed at a distance of 1 cm from the surface, and sequential images from one end to other end of ovary were obtained at a distance of 1 mm. All follicles were aspirated by needle after imaging and were then injected with a pigment after counting by all frequencies. Subsequently, following freezing, 5-mm sections of ovaries were cut and the number of follicles in the sections was counted using a megascope. The follicles were classified into 4 groups according to their diameter: 2 to 3 mm, 4 to 6 mm, 7 to 10 mm, and 11 mm. The number of follicles observed using the megascope was compared with those observed at the 3 US frequencies. The ovaries were classified according to corpus luteum (CL) by determining the condition of the CL. Very red and small-sized CL (stage 1: ovary ovulated within 3 days), elastic and bigger CL (stage 2: ovary ovulated at 4 to 14 days), and regressed CL with yellow color (stage 3: ovary ovulated at 15 to 20 days). The data were analyzed by ANOVA. The results revealed no difference (P > 0.05) in the number of follicles observed in any size category using the US transducers and the megascope. Further, there were no differences between the different transducer frequencies and megascopic observations in terms of the number of follicles ≥4 mm in diameter. The stage of estrus in the ovary also had no effect on the number of follicles observed regardless of follicular size or the US frequency used. In conclusion, these results indicated that follicles could be counted accurately in excised ovaries using 5.0-, 7.5-, and 10.0-MHz transducers. Table 1.The average number of follicles in different frequencies and megascopic (n = 22)

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10

Gard, J. A., J. Roberts, T. Braden, M. Mansour, J. Yelich, K. Irsik, O. Rae, and J. G. Wenzel. "119 ASSESSMENT OF OVARIAN FOLLICULAR DYSPLASIA UTILIZING ULTRASOUND AND HISTOLOGIC EXAMINATION." Reproduction, Fertility and Development 29, no. 1 (2017): 168. http://dx.doi.org/10.1071/rdv29n1ab119.

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A slaughterhouse study commissioned by Florida Cattleman’s Association in 2007 identified ovarian follicular dysplasia (OFD) as a primary cause of infertility in Florida beef cows. Ovaries with OFD have progressive bilateral development of solid clustered follicles containing multiple Call-Exner bodies that originate in the rete ovarii and the hilar region, and progress into the cortex to eventually form bilateral Sertoli-type granulosa theca cell tumours (GTCT). The objectives of this study were to assess the distribution of OFD in cull animals and to evaluate utilisation of ultrasound for diagnosis of OFD in cattle. Ultrasound images of the right and left ovaries from 390 cull cows and heifers representing 4 Florida ranches were made with 5-MHz linear probes (Aloka, Ibex). Then, 10 to 12 females per ranch were followed to slaughter the proceeding day for collection of reproductive tracts. The fixed ovaries were measured, sectioned para-sagittally through the hilus, photographed, and arranged in histology cassettes for complete examination of the cut surface. Large ovarian structures including corpus luteum, Graafian follicles, atretic follicles, dysplastic follicles, rete ovarii, dysplastic follicles, and tumours were counted and measured for each ovary. Ovaries with OFD were graded I to IV. Grade I OFD contained small individual dysplastic follicles with diameter less than 200 µm mostly limited to the rete ovarii and medulla. Grade II OFD possessed dysplastic follicles greater than 200 µm diameter that were present in the medulla and cortex. Grade III OFD had extensive multi-sized dysplastic follicles scattered throughout the entire cortex of the ovary and Grade IV OFD had Sertoli-type GTCT. Grade II–IV often had dystrophic mineralization of dysplastic follicles. Gross morphology of fixed sagittal sections and ultrasound images were blindly compared against OFD grade in 40 individual ovaries. The OFD was identified at slaughter in 29/41 cows and in 1/5 of heifers. The distribution of OFD for 30 affected females was Gr I 16/30, Gr II 9/30, Gr III 4/30, and Gr IV 1/30. Characteristics that could be detected by routine ultrasound included increased size and length, increased hyperechogenicity and decreased number of fluid-filled follicles. Hyperechogenic shadows were evident in higher grade OFD. The study demonstrated that Grade III and IV OFD can be observed by routine ultrasound but Grade I and II may require higher resolution ultrasound probes, imaging analysis software, or Doppler ultrasound.

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Dissertations / Theses on the topic "Cattle Ovaries"

1

Wilson, Stacey J. "The effect of heat stress on ovarian function in dairy cattle /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842573.

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Lekola, Khomotso Podile Molvia. "Improvement of cattle oocyte retrieval techniques and hormonal influence on in vitro embryonic development." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1546.

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Thesis (M. Sc. (Animal Production)) -- University of Limpopo
The objectives of this study were: 1) To determine the effect of oocyte retrieval techniques (slicing and aspiration) on the quality and quantity of cattle oocytes, 2) To evaluate the effect of different concentrations of hormones on the maturational rate of cattle oocytes selected by brilliant cresyl blue staining, 3) To evaluate fertilization rate and cleavage/embryonic development of oocytes with or without cumulus cells, and 4) To compare the effect of fresh and frozen thawed semen on the fertilization rate of cattle oocytes. In Experiment 1: oocytes were recovered from abattoir derived ovaries using slicing and aspiration. The recovered oocytes were exposed for 90 minutes to 26μM of brilliant cresyl blue (BCB) stain and classified according to the colour of their cytoplasm: BCB+ (oocytes with blue cytoplasm) and BCB- (unstained oocytes). There was no difference (P>0.05) in the quality of oocytes recovered using slicing (60.7 %) or aspiration (53.7 %) techniques. In experiment 2: The BCB selected and the non-selected immature oocytes were randomly allocated into medium 199 + 10 % fetal bovine serum (FBS) maturation media. The media was supplemented with three different concentrations of hormones as treatments (T). The T1 (0.5 μg/ml of follicle stimulating hormone (FSH), 5mg/ml of luteinizing hormone (LH) and 2 μg/ml of estradiol (E2) as the control group. Then, T2 (1 μg/ml of FSH, 6 mg/ml of LH and 2.5 μg/ml of E2) and T3 (1.5 μg/ml of FSH, 7 mg/ml of LH and 4.5 μg/ml of E2). Maturation rate of oocytes was determined by the protrusion of the first polar bodies 24 hours following in vitro maturation. Treatment 2 yielded higher (P<0.05) maturation rate for both BCB+ (65.6 %) and without BCB (60.3 %) oocytes with T1 giving lower (P<0.05) maturation rate for BCB+ (22 %) and without BCB (16 %) oocytes. However, BCB- oocytes had lower (P<0.05) polar body extrusion (3.03 %, 8.1 % and 2.2 %) for T1, T2 and T3, respectively. In Experiment 3: one group of the presumptive zygotes was denuded of cumulus cells and the other group was cultured with cumulus cells. The presumptive zygotes were in vitro cultured in SOF-BSA and changed to SOF-FBS after 48 hours. High fertilization/cleavage rate was observed in oocytes cultured with cumulus cells (29.0 %) compared to the denuded oocytes (20.0 %) for 2-4 cells stage. Day 7 blastocysts were more (P<0.05) on oocytes cultured with cumulus cells (32 %) compared to denuded oocytes (13 %). In experiment 4: The matured oocytes were fertilized using fresh and frozen thawed semen. The oocytes fertilized with frozen thawed semen obtained a better number of 2-4 cell cleavage (23 %) when compared to fresh semen (19 %). Oocytes that were fertilized with frozen thawed semen also obtained higher morula (13 %) and blastocyst (8 %) compared to fresh semen with morula (3.4 %) and blastocyst (2 %). In conclusion, immature oocytes that were exposed to BCB+ and cultured in M199 supplemented with 10 % FBS, 0.5 μg/ml of FSH, 5 mg/ml of LH and 2 μg/ml of E2 had a higher (P<0.05) number of matured oocytes (extrusion of first polar body) compared to those that were not exposed to BCB (no BCB). Oocytes that were cultured with cumulus cells yielded a higher (P<0.05) number of cleaved embryos compared to the denuded oocytes. Slicing yielded a higher (P<0.05) number of oocytes, however the quality of oocytes recovered was similar compared to those recovered by the aspiration technique (P>0.05). Oocytes fertilized with frozen thawed semen yielded higher (P<0.05) number of 2-4 cell, morula and blastocyst when compared with oocytes that were fertilized using fresh semen. Keywords: ovaries, oocytes, slicing, aspiration, COCs, BCB, polar body and cattle

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Barkley, Nicole Marie Garverick Henry Allen. "Characterization of apoptosis in the developing bovine fetal ovary association with germ cell loss /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/6105.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract, appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on October 9, 2009) Thesis advisor: Dr. H. Allen Garverick. Vita. Includes bibliographical references.

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Kolath, Sarah Jane. "Ovarian gene expression in heat-stressed dairy cattle /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426077.

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Liu, Zhilin. "Gene expression profiling of bovine ovarian follicular selection." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4490.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pf file; the official abstract appears in the short.pf file (which also appears in the research.pf); a non-technical general description, or public abstract, appears in the public.pf file. Title from title screen of research.pf file (viewed on May 6, 2009) Vita. Includes bibliographical references.

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Calder, Michele D. "Ovarian cysts in dairy cattle : importance of serum LH concentrations in maintenance of cysts and expression of mRNAs for steroidogenic enzymes and gonadotropin receptors /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9924869.

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7

Ribadu, Yusufu. "Ultrasonography and endocrinology of ovarian cysts in cattle." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386799.

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8

Burke, Christopher R. "Regulation of Ovarian Follicular Development with Estradiol in Cattle." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1054666226.

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9

Wrathall, Julia H. M. "Inhibin and the regulation of ovarian function in cattle and sheep." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304807.

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Taylor, Christopher C. "Ovarian activity in postpartum, early pregnant and norgestomet synchronized dairy cattle." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28994.

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Studies to monitor bovine ovarian function with regard to follicular growth and turnover, and corpus luteum (CL) growth and function, were carried out during three different reproductive states: the postpartum anestrus period, early pregnancy and during the artificial control of the estrous cycle with the synthetic progestin norgestomet. Ovarian function was monitored using a combination of ultrasound imaging and progesterone (P₄) profiling. Growth of large antral follicles (> 10mm) was found to commence very early in the postpartum period and ovulation occurred as early as the first week postpartum. Short first postpartum estrous cycles (< 18 days) were observed in a minority of the animals studied (4/10) and the occurance of a short first cycle was not associated with an early ovulation following parturition. Growth of large antral follicles occurred in a wave-like pattern during the postpartum estrous cycles with most cycles being composed of two waves of growth, the second wave resulting in the growth of the ovulatory follicle. A wave-like pattern of growth of large dominant follicles was also seen through the first 60 days of pregnancy. There was no difference between pregnant and non pregnant cows in the size of the dominant follicle found on day 20. In addition no effect of the CL could be found on the side on which the dominant follicle was found, it was as likely to be on the ipsilateral ovary to the CL as on the contra lateral. The gonadotrophin ihibitor norgestomet did not effect follicular dynamics in the presence of the CL, however in the absence of a CL the dominant follicle present was maintained for the duration of the norgestomet treatment and then went on to ovulate upon norgestomet removal. In addition there was no new growth of antral follicles in the absence of a CL. Norgestomet did not effect the temporal relationship between the onset of standing estrus, the LH surge and ovulation. The results of the three studies suggest that a wavelike pattern of growth of large antral follicles is a characteristic of the bovine ovary regardless of the reproductive state.
Land and Food Systems, Faculty of
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Books on the topic "Cattle Ovaries"

1

Guraya, Sardul S. Ovarian biology in buffaloes and cattle. New Delhi: Directorate of Information and Publication of Agriculture, Indian Council of Agricultural Research, 1997.

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Galvin, James A. Ovarian follicular development following oestrus syncronization programmes at different stages of the oestrous cycle in lactating dairy cows. Dublin: University College Dublin, 1995.

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Johnson, Katrina Sue. The effects of age of cow, calving month, calving year, herd and genetics on the incidence of ovarian cysts in Holstein dairy cows. 1994.

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4

Roberge, Sylvie. Endrocrine profiles in cystic ovarian diseased dairy cows and postpartum beef cows. 1991.

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Rijksuniversiteit te Utrecht. Faculteit der Diergeneeskunde., ed. The bovine oestrous cycle and pregnancy in vision. 2nd ed. [Boxmeer, The Netherlands: Intervet International BV, 1996.

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Sota, Rodolfo Luzbel De la. Endocrine and molecular changes associated with ovarian follicular dominance in cattle. 1995.

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Lucy, Matthew Christian. Effects of calcium salts of long-chain fatty acids, growth factors, and energy balance on ovarian follicular dynamics in postpartum dairy cows. 1990.

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Chang, Ching-Fong. The regulation of reproduction in cattle by an antiestrogen, or active immunization against prostaglandin F₂Ü and ovarian steroids. 1986.

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Book chapters on the topic "Cattle Ovaries"

1

Adams, Gregg P., and Jaswant Singh. "Ovarian Follicular and Luteal Dynamics in Cattle." In Bovine Reproduction, 219–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118833971.ch24.

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Conference papers on the topic "Cattle Ovaries"

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Liu, Jun, and Hao Chen. "Automatic detection of follicle in ultrasound images of cattle ovarian using MCL method." In 2016 IEEE International Conference on Systems, Man, and Cybernetics (SMC). IEEE, 2016. http://dx.doi.org/10.1109/smc.2016.7844491.

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