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Animal Science Database

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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 objectives were to determine pregnancy rates following fixed-time AI (FTAI) in heifers: (1) given GnRH or estradiol cypionate (ECP) to synchronize follicular wave emergence and ovulation in a CIDR-based protocol; and (2) fed diets supplemented with flax or sunflower seeds. At two locations,...

Author(s)
Colazo, M. G.; Kastelic, J. P.; Martínez, M. F.; Whittaker, P. R.; Wilde, R.; Ambrose, J. D.; Corbett, R.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2004, 61, 6, pp 1115-1124
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

The objective was to determine the efficacy of a previously used CIDR or melengestrol acetate (MGA; 0.5 mg/head/day) for resynchronization of oestrus in beef heifers not pregnant to timed-AI (TAI). In three experiments and a field trial, heifers were reinseminated 6-12 h after first detection of...

Author(s)
Colazo, M. G.; Kastelic, J. P.; Mainar-Jaime, R. C.; Gavaga, Q. A.; Whittaker, P. R.; Small, J. A.; Martinez, M. F.; Wilde, R. E.; Veira, D. M.; Mapletoft, R. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 3, pp 557-572
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
Abstract

The objective was to determine reproductive performance following AI in beef heifers given estradiol to synchronize ovarian follicular wave emergence and estradiol or GnRH to synchronize ovulation in a two-dose PGF-based protocol. In Experiment 1, 561 cycling (confirmed by ultrasonography), Angus...

Author(s)
Martínez, M. F.; Kastelic, J. P.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2004, 62, 1/2, pp 363-372

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