Journal ArticleDOI
Synchronization of ovulation in dairy cows using PGF2α and GnRH
TLDR
A new method for synchronizing the time of ovulation in cattle using GnRH and PGF2α could have a major impact on managing reproduction in lactating dairy cows, because it allows for AI to occur at a known time of Ovulation and eliminates the need for detection of estrus.About:
This article is published in Theriogenology.The article was published on 1995-11-01. It has received 1308 citations till now. The article focuses on the topics: Controlled internal drug release & Ovulation.read more
Citations
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Journal ArticleDOI
A lameness scoring system that uses posture and gait to predict dairy cattle reproductive performance
TL;DR: It is believed that a 5-point lameness scoring system that assessed gait and placed a novel emphasis on back posture effectively identifies lame cows and should trigger corrective interventions.
Journal ArticleDOI
Heat stress and seasonal effects on reproduction in the dairy cow--a review.
TL;DR: Recent studies suggest that the use of gonadotropins to induce follicular development and ovulation can decrease the severity of seasonal postpartum infertility in dairy cows.
Journal ArticleDOI
Synchronization rate, size of the ovulatory follicle, and pregnancy rate after synchronization of ovulation beginning on different days of the estrous cycle in lactating dairy cows.
José Luiz Moraes Vasconcelos,José Luiz Moraes Vasconcelos,R.W. Silcox,Guilherme J. M. Rosa,J.R. Pursley,Milo C. Wiltbank +5 more
TL;DR: Although overall synchronization rate with Ovsynch was above 85%, there were clear differences in response according to day of protocol initiation, with cows in which Ov synch was initiated at midcycle having smaller ovulatory follicles and greater pregnancy rates.
Journal ArticleDOI
Reproductive Management of Lactating Dairy Cows Using Synchronization of Ovulation
TL;DR: A timed artificial insemination protocol that synchronized the time of ovulation using GnRH and PGF2 alpha allowed effective management of AI in lactating dairy cows without the need for estrus detection.
Journal ArticleDOI
Effects of presynchronization and bovine somatotropin on pregnancy rates to a timed artificial insemination protocol in lactating dairy cows.
TL;DR: It is suggested that presynchronization and bST treatment may be used to increase first-service pregnancy rates to a timed artificial insemination protocol and that pregnancy rates were increased for cows treated with bST when cows were presynchronized.
References
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Journal ArticleDOI
Interrelationships between energy balance and postpartum reproductive function in dairy cattle.
W.R. Butler,R.D. Smith +1 more
TL;DR: Negative energy balance probably acts similarly to undernutrition and may manifest in delayed ovarian activity by impinging on pulsatile secretion of LH, and lower availability of glucose and insulin may also decrease LH pulsatility or limit ovarian responsiveness to gonadotropins.
Journal ArticleDOI
Development of a microtitre plate enzyme immunoassay for the determination of progesterone
C. Munro,G. Stabenfeldt +1 more
TL;DR: This assay system allows accurate determination of progesterone in plasma with good specificity, precision and accuracy, and is suitable for the rapid assessment of luteal function and reproductive status in both clinical and research situations in a wide variety of species.
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Concepts for regulation of corpus luteum function by the conceptus and ovarian follicles to improve fertility
Journal ArticleDOI
Fertility of cattle following PGF2 alpha injection.
J. W. Lauderdale,B. E. Seguin,J. N. Stellflug,J. R. Chenault,W. W. Thatcher,C. K. Vincent,A. F. Loyancano +6 more
Journal ArticleDOI
Prostaglandin F2 alpha receptors in the early bovine corpus luteum.
TL;DR: In conclusion, a single class of high-affinity PGF2 alpha receptors was present within the bovine CL by 2 days after ovulation; therefore the reported lack of responsiveness to PGF1 alpha in the early CL was not attributable to a deficiency of high.