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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 objective was to determine the effect of plasma progesterone concentration and the duration of proestrus during growth of the ovulatory follicle on fertility in beef cattle. Heifers (N=61) and postpartum cows (N=79) were assigned randomly to four groups in a two-by-two design involving...

Author(s)
Dadarwal, D.; Mapletoft, R. J.; Adams, G. P.; Pfeifer, L. F. M.; Creelman, C.; Singh, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2013, 79, 5, pp 859-866
Abstract

The objective was to determine the effects of the duration of progesterone exposure during the ovulatory wave on fertility (pregnancy rate) in beef cattle. We tested the hypothesis that short-progesterone exposure during the growing and early-static phase of the ovulatory follicle (analogous to the ...

Author(s)
Dias, F. C. F.; Mapletoft, R. J.; Kastelic, J. P.; Adams, G. P.; Colazo, M. G.; Stover, B. C.; Dochi, O.; Singh, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 77, 2, pp 437-444
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
Abstract

Research on the reproductive physiology of South American camelids is summarized and the application of new reproductive techniques to these species is reviewed. Artificial insemination, superovulation, embryo transfer and in vitro fertilization have now been succesfully applied to camelids. In...

Author(s)
Campo, M. R. del; Campo, C. H. del; Adams, G. P.; Mapletoft, R. J.
Citation
Theriogenology, 1995, 43, 1, pp 21-30
Abstract

A study was designed to compare superovulatory responses in cattle when gonadotropin treatment followed 1 of 3 different treatments to synchronize follicular wave emergence. Animals at unknown stages of the oestrous cycle were randomly assigned to 3 groups: ablation of the 2 largest follicles per...

Author(s)
Baracaldo, M. I.; Martinez, M. F.; Adams, G. P.; Mapletoft, R. J.
Citation
Theriogenology, 2000, 53, 6, pp 1239-1250

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