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Animal Science Database

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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

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

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

The objective was to synchronize follicular wave emergence among cattle for synchronization of oestrus and ovulation, and to determine pregnancy rate after AI at observed oestrus. At random stages of the oestrous cycle, a controlled internal drug release device (CIDR-B) was inserted intravaginally...

Author(s)
Martinez, M. F.; Adams, G. P.; Kastelic, J. P.; Bergfelt, D. R.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2000, 54, 5, pp 757-769
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
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

Two experiments were conducted to determine oestrous response and pregnancy rate in beef cattle given a controlled internal drug release (CIDR-B) device plus PGF at CIDR-B removal, and estradiol or GnRH. In Experiment I, crossbred beef heifers received a CIDR-B device and 1 mg estradiol benzoate...

Author(s)
Martínez, M. F.; Kastelic, J. P.; Adams, G. P.; Janzen, E.; McCartney, D. H.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2000, 41, 10, pp 786-790
Abstract

Two experiments were conducted to compare pregnancy rates when GnRH or estradiol were given to synchronize ovarian follicular wave emergence and ovulation in an MGA-based oestrus synchronization programme. Crossbred beef cattle were fed melengestrol acetate (MGA, 0.5 mg per day) for 7 days...

Author(s)
Martinez, M. F.; Kastelic, J. P.; Adams, G. P.; Mapletoft, R. J.
Publisher
Elsevier Science B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2001, 67, 3/4, pp 221-229

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