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Oestrous behaviour and initiation of oestrous cycles in postpartum Brahman - influenced cows after treatment with progesterone and prostaglandin F2 alpha

, : Oestrous behaviour and initiation of oestrous cycles in postpartum Brahman - influenced cows after treatment with progesterone and prostaglandin F2 alpha. Journal of Animal Science 84(7): 1916-1925

Spring-calving, crossbred (1/4 to 3/8 Brahman) primiparous (n=56) and multiparous (n=102) beef cows were used to evaluate the effects of progesterone, delivered via a controlled internal drug-releasing (CIDR) device, and prostaglandin F2 alpha (PGF2 alpha ) on oestrous behaviour, synchronization rate, initiation of oestrous cycles, and pregnancy rate during a 2-yr period. To determine luteal activity, weekly blood samples were collected 3 wk before initiation of a 75-d breeding season.


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