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Kansas Agricultural Experiment Station Research Reports
Kansas Agricultural Experiment Station contribution; no. 86-94-S; Report of progress (Kansas Agricultural Experiment Station); 484; Dairy; Prostaglandin F2-α; Fixed-time AI; Estrus; Conception rates
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Full-Text Articles in Life Sciences
Controlling Calving Intervals With Prostaglandin F2Α And Fixed-Time Inseminations (1985), Jeffrey S. Stevenson, M.C. Lucy, Edward P. Call
Controlling Calving Intervals With Prostaglandin F2Α And Fixed-Time Inseminations (1985), Jeffrey S. Stevenson, M.C. Lucy, Edward P. Call
Kansas Agricultural Experiment Station Research Reports
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. …