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Effect of progestogen intra vaginal sponges and pregnant mare serum gonadotropin on synchronization of estrus in maiden heifers and on interval from calving to estrus in beef cows

, : Effect of progestogen intra vaginal sponges and pregnant mare serum gonadotropin on synchronization of estrus in maiden heifers and on interval from calving to estrus in beef cows. New Zealand Journal of Experimental Agriculture 8(3-4): 199-204

The effectiveness of progestogen sponges plus pregnant mare serum gonadotropin (PMSG) in inducing and synchronizing estrus and pregnancy in nulliparous heifers was assessed. Most treated heifers (81%) were synchronized, but none of the controls were. The hormone treatment advanced the mean calving date by 19 days but there was no difference between treatment and control in the percentage of heifers that finally calved. The interval between calving and 1st estrus for hill-country beef cows 2-10 yr old in an untreated control group was 94 days, in a group treated with these sponges plus 1000 IU of PMSG at the time of withdrawal was 85 days. The last treatment reduced post-partum anestrus by 11 days in comparison with the mean of the other 2 treatments (P < 0.01). There was no difference between age groups in the percentage of cows showing estrus, conceiving to 1st service and calving for the control treatment. In the 2 hormone treatments none of the 2-yr-old cows conceived to 1st estrus and 13% calved but 46% of cows in the older age groups conceived to 1st estrus and 79% calved.

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