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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; GnRH; PGF2; Estrus synchronization; Heifers; Dairy
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Various Estrus-Synchronization Programs For Heifers (1997), Jeffrey S. Stevenson
Various Estrus-Synchronization Programs For Heifers (1997), Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Various programs of estrus synchronization have been tested during the last 6 years to determine the least costly and most efficacious for dairy heifer replacements. Four systems were tested: 1) a modified Ovsynch treatment (GnRH 7 days before PGF2 α followed by GnRH either at 24, 30, 33, 40, or 48 hr, with one fixed-time insemination 16 to 20 hr later); 2) a similar protocol that used GnRH 7 days before PGF 2α followed by insemination at estrus (GnRH + PGF 2α); 3) inseminations after one or two injections of PGF 2α given 14 days apart (PGF2α; heifers not detected …