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By Epstein P. S.

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SUMMARY Syncro-Mate-B and other products combining estradiol and progestin are effective in synchronizing estrus in cycling cows and in inducing estrus in some anestrous cows. The efficacy of SMB is limited by the failure of estradiol to consistently regress the corpus luteum in cyclic animals that begin treatment during the first 5 days of the estrous cycle. The fertility of cows and heifers that begin treatment late (>day 14) in the estrous cycle may be lower than that of animals synchronized at other times.

L. E. D. Warnick. 1998. Timing of insemination for dairy cows identified in estrus by a radiotelemetric estrus detection system. J. Dairy Sci. 81:1874. G. J. S. Pope. 1980. A quantitative study of pre-ovulatory behaviour in cattle (British Friesian heifers). Applied Anim. Ethol. 6:1. H. 1975. Estrus detection and estrus detection aids. J. Dairy Sci. 58:248. F. P. E. Long. 1989. Behavioral predictors of oestrus in domestic cattle, Bos taurus. Anim. Behav. 38:913. L. J. D. L. McGilliard. 1990. Effectiveness of rump-mounted devices and androgenized females for detection of estrus in dairy cattle.

Number of mounts recorded during the synchronized estrus. , Athens, GA. 05 compared with corresponding values in the same column and in the same study. conception and the time interval from the first mount to artificial insemination; the greatest conception rates in these mature dairy cows occurred at 4 to 12 hours after the onset of standing to receive a mount. The appropriate timing of insemination ultimately is that time which permits the bull’s semen to encounter the cow’s released ova at a time and place that permits conception to occur.

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