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Kansas Agricultural Experiment Station Research Reports
1997; Kansas Agricultural Experiment Station contribution; no. 98-100-S; Report of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 792; OvSynch; Synchronized estrus; Conception; Pregnancy rates
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Conception And Pregnancy Rates In Dairy Cows After Various Programmed Breeding Systems (1997), Jeffrey S. Stevenson, K. E. Thompson, Y. Kobayashi
Conception And Pregnancy Rates In Dairy Cows After Various Programmed Breeding Systems (1997), Jeffrey S. Stevenson, K. E. Thompson, Y. Kobayashi
Kansas Agricultural Experiment Station Research Reports
Two experiments were conducted to measure conception and pregnancy rates in lactating dairy cows after various treatments followed by artificial insemination (AI) after detected estrus or at one fixed time. In Experiment 1, Holstein cows in one herd were assigned randomly to four treatments every 3 wk (27, 3-wk cluster groups): 1)Ovsynch33, 2) GnRH+PGF2α, 3) 2xPGF2α, and 4) 2xPGF2α+GnRH. In Experiment 2, Holstein cows in one herd were assigned randomly to two treatments every 3 wk (14, 3-wk cluster groups): 1) Ovsynch48 and 2) GnRH+PGF2α. In both experiments, frozen-thawed semen from multiple sires was used, one technician performed>95% of …