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Delaying Injection Of Prostaglandin F2Α In An Ovsynch Protocol (2006), M.A. Portaluppi, D.E. Tenhouse, Jeffrey S. Stevenson
Delaying Injection Of Prostaglandin F2Α In An Ovsynch Protocol (2006), M.A. Portaluppi, D.E. Tenhouse, Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Our objective was to determine whether delaying the PGF2αinjection by 24 or 48 hr after the first GnRH injection in an Ovsynch protocol (from a standard 7 days) altered ovar-ian characteristics in lactating dairy cows. Es-trous cycles were synchronized in 36 Hol-steins after removal of a progesterone-releasing controlled internal drug release (CIDR) insert and injection of PGF2α. On day 6 of the estrous cycle, cows were administered 100 μg of GnRH (81 ± 2 days postpartum) and assigned randomly to receive a treatment in-jection of PGF2α7, 8, or 9 days later. Timed artificial insemination (TAI) was performed at 48 hr …
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 …