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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

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