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Genetic improvement of meat sheep part 4 effect of age of dam on productivity of dorset and border leicester sheep



Genetic improvement of meat sheep part 4 effect of age of dam on productivity of dorset and border leicester sheep



Australian Journal of Experimental Agriculture and Animal Husbandry 17(88): 735-740



The effect of age of the dam on the number of lambs born (LBL) and weaned (LWL) and the weight of lambs weaned (WLWL) per ewe lambing and on the number of lambs weaned per lamb born (LWB) and lamb weaning weight (WWT) was estimated for Dorset and Border Leicester sheep. In both breeds, LBL, LWL and WLWL showed a clear association with age of the dam, rising to a peak at a dam age of 5 yr in the Dorsets and at between 4-6 yr in the Border Leicester. The association between age of dam and WWT and LWB was less marked. WWT rose to a peak in both breeds at a dam age of 5 yr and LWB rose to a peak at 4 and 3 yr in the Dorsets and Border Leicester, respectively. The estimates of ewe productivity were used to calculate the productivity of Dorset flocks of differing age structures. Maximum productivity was achieved with a flock aged from 2-6 years.

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Accession: 005514948

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