Optimization of ’herd-in-calf rate’ with respect to the length of the postpartum anoestrous period in Angus cows suckling calves

TitleOptimization of ’herd-in-calf rate’ with respect to the length of the postpartum anoestrous period in Angus cows suckling calves
Publication TypeConference Paper
Year of Publication1991
AuthorsPleasants, A B., RA Barton, ST Morris, and WJ Anderson
Conference NameProceedings of the New Zealand Society of Animal Production
Date PublishedJan
PublisherNew Zealand Society of Animal Production
Abstract

A trial was undertaken to evaluate the effectiveness of the CIDR-B in buffalo. Twenty four, 20 month old buffalo heifers had CIDR’s inserted (day 0) for 12 days. Each heifer was injected intramuscularly with 10 mg of oestradiol benzoate at CIDR insertion and 150 IU of PMSG at CIDR removal. Two buffalo bulls fitted with chin ball harnesses were introduced into each of 2 groups of 12 heifers. Continuous observations of mating activity commenced 24 hours after CIDR withdrawal. The heifers were bled for progesterone analysis on days -20, -9, 0, 2, 7, 12 and 26.9 CIDR’s (38%) lost from the heifers were replaced immediately after the losses were noticed. The mean interval from CIDR removal to onset of mating activity was 50.3

URLhttp://www.nzsap.org/proceedings/1991/optimization-herd-calf-rate-respect-length-postpartum-anoestrous-period-angus-cows
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