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Abstract

The objective was to compare pregnancy rates following fixed-time AI (FTAI) in beef cattle given a new or previously used CIDR insert and injections of estradiol, with or without progesterone, to synchronize follicular wave emergence. In Experiment 1, heifers (n=616) received a new or once-used...

Author(s)
Colazo, M. G.; Kastelic, J. P.; Whittaker, P. R.; Gavaga, Q. A.; Wilde, R.; Mapletoft, R. J.
Publisher
Elsevier Science B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2004, 81, 1/2, pp 25-34
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