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Abstract

Protocols designed to control follicular wave dynamics and ovulation in cattle have reduced, and even eliminated, the need for estrus detection. The addition of progestin-releasing devices and gonadotropin treatments, such as equine chorionic gonadotropin, have provided possibilities for increased...

Author(s)
Mapletoft, R. J.; Bó, G. A.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Proceedings of the 45th Annual Conference of the American Association of Bovine Practitioners, Montreal, Canada, 20-22 September, 2012, 2012, pp 40-48
Abstract

The main objective of the implementation of Artificial Insemination (AI) in cattle is to produce a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology, its widespread implementation is very recent and is mainly due to the use of protocols that allows the AI...

Author(s)
Bó, G. A.; Baruselli, P. S.; Mapletoft, R. J.
Publisher
Colégio Brasileiro de Reprodução Animal, Belo Horizonte, Brazil
Citation
Animal Reproduction (Belo Horizonte), 2013, 10, 3, pp 137-142
Abstract

Repeat breeding is an important factor affecting economic success in dairy management. The objective of this study was to investigate the effectiveness of transfer of frozen-thawed IVF embryos in establishing pregnancy in repeat-breeding Holstein cattle. Cumulus oocyte complexes were collected by...

Author(s)
Dochi, O.; Takahashi, K.; Hirai, T.; Hayakawa, H.; Tanisawa, M.; Yamamoto, Y.; Koyama, H.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2008, 69, 1, pp 124-128
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

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

Recent protocols which provide possibilities for oestrus synchronization that is precise enough to permit fixed-timed artificial insemination or embryo transfer without the need for oestrus detection are described. Synchronization of oestrus and ovulation; the use of GnRH, pLH, progesterone and...

Author(s)
Bó, G. A.; Mapletoft, R. J.
Publisher
Ordre des médecins vétérinaires du Québec, Saint-Hyacinthe, Canada
Citation
Médecin Vétérinaire du Québec, 2004, 34, 1/2, pp 57-59
Abstract

The objective of this study was to determine the effects of low versus physiologic plasma progesterone concentrations during the ovulatory wave on fertility in cattle. Suckled beef cows (Bos taurus; n=129) and pubertal heifers (Bos taurus; n=150) at random stages of the estrous cycle were given a...

Author(s)
Pfeifer, L. F. M.; Mapletoft, R. J.; Kastelic, J. P.; Small, J. A.; Adams, G. P.; Dionello, N. J.; Singh, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2009, 72, 9, pp 1237-1250
Abstract

Our expanding knowledge of the control of follicular wave dynamics during the bovine oestrous cycle has resulted in renewed enthusiasm for the prospects of precisely controlling the follicular and luteal dynamics and the time of ovulation. Follicular wave development can be controlled mechanically...

Author(s)
Bó, G. A.; Baruselli, P. S.; Moreno, D.; Cutaia, L.; Caccia, M.; Tríbulo, R.; Tríbulo, H.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2002, 57, 1, pp 53-72

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