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Dose And Frequency Of Pgf2Α Administration To Lactating Dairy Cows Exposed To Presynchronization And Either Five- Or Seven-Day Ovsynch Protocols: Ovulation, Luteolysis, And Pregnancy Rates, J. S. Stevenson, J. A. Sauls
Dose And Frequency Of Pgf2Α Administration To Lactating Dairy Cows Exposed To Presynchronization And Either Five- Or Seven-Day Ovsynch Protocols: Ovulation, Luteolysis, And Pregnancy Rates, J. S. Stevenson, J. A. Sauls
Kansas Agricultural Experiment Station Research Reports
Lactating Holstein cows in one herd were milked three times daily and enrolled in a 2 × 2 × 2 factorial design with eight treatments before first postpartum artificial insemination (AI). These treatments were employed to test ovulatory, progesterone, and luteolytic outcomes to three main effects: (1) two GnRH-PGF2αpresynchronization programs (PG-3-G vs. Double Ovsynch); (2) 5- vs. 7-day Ovsynch-duration programs; and (3) two doses (25 mg on consecutive days) or one dose (50 mg) of PGF2αadministered before timed AI. Results from this experiment demonstrate no differences in the presynchronization treatments of PG-3-G vs. Double Ovsynch; both …
Resynchronization Of Lactating Dairy Cows At Open Pregnancy Diagnosis Based On The Presence Or Absence Of A Corpus Luteum: A Practical Approach, J. A. Sauls, J. S. Stevenson
Resynchronization Of Lactating Dairy Cows At Open Pregnancy Diagnosis Based On The Presence Or Absence Of A Corpus Luteum: A Practical Approach, J. A. Sauls, J. S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Lactating Holstein cows in three herds were enrolled in a study at the time of nonpregnancy diagnosis. Cows were assigned to a resynchronization program based on ovarian structures determined by transrectal ultrasonography. Three resynchronization treatments were employed starting on the day of open diagnosis to test: (1) accuracy of ultrasound technician’s ability to identify a functional corpus luteum (CL); (2) whether an initial GnRH injection is required to start resynchronization when a CL is present at nonpregnant diagnosis (Short Synch: PGF2α— 24 hours — PGF2α— 32 hours — GnRH — 16 hours — timed artificial insemination …