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Gonadotropin releasing hormone therapy in anestrous repeat breeder and follicular cystic cows


, : Gonadotropin releasing hormone therapy in anestrous repeat breeder and follicular cystic cows. Indian Veterinary Journal 68(3): 267-270

The therapeutic efficacy of a gonadotrophin releasing hormone (GnRH) analogue for induction of oestrus in anoestrous cows was better in zeub .times. taurus (50%) than in zebu (26.7%) cows with 25.0, 58.4 and 16.6% of the treated cows showing oestrus at intervals of 2 to 3, 10 to 14 and 17 to 20 days respectively. However, significantly higher (P < 0.01) conceptions and shorter (P < 0.01) interval to conception after three oestrous periods was observed when GnRH was preceded by 7 day progestogen treatment. Treatment of repeat breeder cows with GnRH at the time of insemination or at mid-cycle prior to insemination resulted in a conception rate of 54.2% and for follicular cystic cows, a conception rate of 42.9% at first service and 71.4% after 3 oestrous periods.

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