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Abstract

This is a review of the physiology and endocrinology of the estrous cycle and how ovarian physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef and dairy cattle. Estrus detection is required for artificial insemination (AI), but it is done poorly in dairy...

Author(s)
Colazo, M. G.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2014, 55, 8, pp 772-780
Abstract

Detecting estrus requires considerable time and labour, and is often inefficient and inaccurate; therefore, estrus detection usually limits reproductive performance in artificial insemination (AI) programs. However, synchronization of ovulation facilitates timed AI without detection of estrus. The...

Author(s)
Kastelic, J. P.; Mapletoft, R. J.; Colazo, M. G.; Martinez, M. F.
Publisher
Magyar Mezógazdaság Kiadó KFT, Budapest, Hungary
Citation
Magyar Állatorvosok Lapja, 2008, 130, Supplement 1, pp 58-62
Abstract

Greater milk production in modern dairy cattle has led to greater nutritional needs, increased rates of post-partum anoestrus, reduced oestrus detection rates, lower conception and pregnancy rates and a higher incidence of embryonic mortality. In addition, larger herds have resulted in management...

Author(s)
Bó, G. A.; Mapletoft, R. J.
Publisher
British Cattle Veterinary Association, Quedgeley, UK
Citation
Cattle Practice, 2012, 20, 1, pp 19-28
Abstract

The objective was to determine reproductive performance following AI in beef heifers given estradiol to synchronize ovarian follicular wave emergence and estradiol or GnRH to synchronize ovulation in a two-dose PGF-based protocol. In Experiment 1, 561 cycling (confirmed by ultrasonography), Angus...

Author(s)
Martínez, M. F.; Kastelic, J. P.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2004, 62, 1/2, pp 363-372