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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...

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