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Abstract

Compared to Bos taurus breeds, Bos indicus breeds of cattle present several differences in reproductive physiology. Follicular diameter at deviation and at the time of ovulatory capability are smaller in B. indicus breeds. Furthermore, B. indicus breeds have a greater sensitivity to gonadotropins,...

Author(s)
Baruselli, P. S.; SáFilho, M. F. de; Martins, C. M.; Nasser, L. F.; Nogueira, M. F. G.; Barros, C. M.; Bó, G. A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 1, pp 77-88
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

Pregnancy per AI (P/AI) following the use of 1 of 2 timed AI (TAI) protocols and 2 different intervals between TAI and resynchronization were compared in heifers that were inseminated with either conventional or sex-sorted semen. Holstein heifers (n=317; 527 inseminations) were submitted to a 5-d...

Author(s)
Macmillan, K.; Loree, K.; Mapletoft, R. J.; Colazo, M. G.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 5, pp 4134-4138
Abstract

Ovulation of an early-stage dominant follicle induced by exogenous GnRH reportedly results in a reduced ovulatory follicle size and fertility in beef and dairy cattle. Objectives were to examine factors associated with ovulatory follicle diameter and the relationship between ovulatory follicle...

Author(s)
Colazo, M. G.; Behrouzi, A.; Ambrose, D. J.; Mapletoft, R. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2015, 84, 3, pp 377-383
Abstract

The development of treatments that control follicular wave dynamics during the bovine oestrous cycle has resulted in interesting possibilities for the precise control of follicular wave emergence and the time of ovulation. For superstimulation, follicular wave emergence can be controlled by...

Author(s)
Bó, G. A.; Baruselli, P. S.; Chesta, P. M.; Martins, C. M.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 1, pp 89-101
Abstract

Two experiments evaluated the effects of timing of the induction of ovulation in superstimulated lactating Holstein donor cows that were fixed-time artificially inseminated. Secondary objectives were to evaluate the effects of the timing of progesterone (P4) device removal (Experiment 1) or the...

Author(s)
Martins, C. M.; Rodrigues, C. A.; Vieira, L. M.; Mapletoft, R. J.; Bó, G. A.; SáFilho, M. F.; Baruselli, P. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 78, 5, pp 974-980
Abstract

Treatments designed to synchronize luteolysis, preovulatory follicular development, and ovulation, and resynchronize oestrus after a first AI have improved responses to synchronization treatments. Protocols based only on the use of PGF result in variable onset of oestrus. Concentrations of...

Author(s)
Cavalieri, J.; Hepworth, G.; Fitzpatrick, L. A.; Shephard, R. W.; Macmillan, K. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 1, pp 45-64
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

Three experiments were conducted to determine the effects of presynchronization and treatment with equine chorionic gonadotropin (eCG) on corpus luteum (CL) and ovarian follicular development, plasma progesterone concentrations, and pregnancy rates in beef heifers subjected to a gonadotropin...

Author(s)
Small, J. A.; Colazo, M. G.; Kastelic, J. P.; Erickson, N. E.; Mapletoft, R. J.
Publisher
Agricultural Institute of Canada, Ottawa, Canada
Citation
Canadian Journal of Animal Science, 2010, 90, 1, pp 23-34
Abstract

Although the discovery that follicles in bovine ovaries grow in a wave-like fashion has presented challenges for estrus synchronization and superovulation, recent protocols, designed to control follicular function have permitted fixed-time AI or fixed-time embryo transfer with high pregnancy rates, ...

Author(s)
Mapletoft, R. J.; Bó, G. A.; Baruselli, P. S.
Publisher
Colégio Brasileiro de Reprodução Animal, Belo Horizonte, Brazil
Citation
Animal Reproduction (Belo Horizonte), 2009, 6, 1, pp 114-124

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