Effects of treatment of anestrous dairy cows with gonadotropin-releasing hormone, prostaglandin, and progesterone (original) (raw)

2010, Journal of dairy science

Cows anestrous at the start of a seasonal breeding period have lesser probability of breeding, lesser conception rates, and a longer interval to conception than cycling herdmates. Historically, treatment included estradiol benzoate, which is no longer available. Consequently, alternative programs are required. Hence, a study was undertaken to assess new treatment regimens for these cows. The presence or absence of a corpus luteum was determined using ultrasonography in cows (n=2,222 from 12 herds) that were not detected in estrus by 9 d before the start of breeding. Cows were then randomly assigned to one of 4 treatments within each herd. Treatments were (1) 100 microg of gonadorelin, followed 7 d later by 500 microg of sodium cloprostenol, followed 54 to 56h later by 100 microg of gonadorelin, followed by fixed-time artificial insemination at 13 to 18h after the final GnRH injection (Ovsynch); (2) as for (1) but with placement of an intravaginal progesterone (P4)-releasing insert b...

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