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2006; Kansas Agricultural Experiment Station contribution; no. 07-118-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 965; Dairy; Luteolysis; Ovsynch; Ovulation; Pregnancy rate
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Resynchronization Of Ovulation And Conception In Nonpregnant Dairy Cows And Heifers (2006), M.A. Portaluppi, D.E. Tenhouse, Jeffrey S. Stevenson
Resynchronization Of Ovulation And Conception In Nonpregnant Dairy Cows And Heifers (2006), M.A. Portaluppi, D.E. Tenhouse, Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Our objectives were to determine various factors influencing upfront single and multiple ovulation in response to GnRH in a timed arti-ficial insemination (TAI) protocol and subse-quent fertility after altering timing of the sec-ond GnRH injection and AI relative to PGF2αinjection. Replacement heifers (n = 86) and 613 lactating cows previously inseminated were diagnosed not pregnant at biweekly in-tervals to form 77 breeding clusters spanning 36 months. At not-pregnant diagnosis (day 0), females received 100 μg of GnRH, and they received 25 mg of PGF2α7 days later. Females in 2 treatments received GnRH 48 hr (G48) after PGF2αinjection and TAI at …