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Angus (n=6), Brangus (5/8 Angus×3/8 Brahman, n=6), and Brahman×Angus (3/8 Angus×5/8 Brahman, n=6) heifers exhibiting estrous cycles at regular intervals were used to determine if the percentage of Bos indicus breeding influenced the secretory patterns of LH in response to a GnRH treatment on Day 6 of the estrous cycle. Heifers were pre-synchronized with a two-injection PGF 2α protocol (25mg...
Two experiments evaluated a modified delivery of prostaglandin F 2α (PGF 2α ) after a melengestrol acetate (MGA) treatment in Angus and Bos indicus×Bos taurus (BI) heifers. Experiment 1 was replicated three times with yearling BI heifers (n=695). Heifers received MGA (0.5mghead −1 day −1 ) for 14 days. In Replications 1 and 2, heifers received either 25mg of PGF ...
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