Controlling calving intervals with prostaglandin F2αand fixed-time inseminations

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Show simple item record Stevenson, Jeffrey S. Lucy, M.C. Call, Edward P. 2012-10-04T19:23:19Z 2012-10-04T19:23:19Z 2012-10-04
dc.description.abstract Prolonged or delayed interval to first breeding is a major cause of long calving intervals. Our objective was to test two methods of artificial insemination by appointment after controlling the onset of estrus for all first breedings after calving. Prostaglandin F2α (PGF) was used to time the onset of estrus for cows in two experimental groups. Control cows (inseminated at first heat after 42 days postpartum) had longer intervals to first breeding than the two experimental groups given PCF at 40 to 46 and 51 to 57 days postpartum. Conception rates were lower in the treated cows than in control cows. However, no differences were observed for calving intervals, which ranged in average days from 379 to 384 for treated cows and averaged 376 days for control cows. We were able to reduce successfully the interval to first breeding so all cows were first bred by approximately 60 days postpartum in the experimental groups, but we were unable to shorten overall calving intervals. en_US
dc.publisher Kansas Agricultural Experiment Station en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 86-94-S en_US
dc.relation.isPartOf Report of progress (Kansas Agricultural Experiment Station); 484 en_US
dc.subject Dairy en_US
dc.subject Prostaglandin F2-alpha en_US
dc.subject Fixed-time AI en_US
dc.subject Estrus en_US
dc.subject Conception rates en_US
dc.title Controlling calving intervals with prostaglandin F2αand fixed-time inseminations en_US
dc.type Conference paper en_US 1985 en_US
dc.citation.epage 48 en_US
dc.citation.spage 47 en_US
dc.description.conference Dairy Day, 1985, Kansas State University, Manhattan, KS, 1985
dc.contributor.authoreid jss en_US

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