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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

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

Four experiments were conducted to investigate modifications to gonadotropin releasing hormone (GnRH)-based fixed-time artificial insemination (AI) protocols in beef cattle. In Experiment 1, the effect of reducing the interval from GnRH treatment to prostaglandin (PGF) was examined. Lactating beef...

Author(s)
Martínez, M. F.; Kastelic, J. P.; Adams, G. P.; Cook, B.; Olson, W. O.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2002, 57, 3, pp 1049-1059
Abstract

The objective of this experiment was to compare two progestins and three treatments for synchronizing follicular wave emergence and ovulation in protocols for fixed-time AI in beef heifers. On day 0 (beginning of the experiment), Angus and Angus-Simmental cross beef heifers at random stages of the...

Author(s)
Martinez, M. F.; Kastelic, J. P.; Adams, G. P.; Mapletoft, R. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2002, 80, 7, pp 1746-1751