Abstract
Currently, 30–43% of New Zealand sheep farmers breed their ewe lambs, but few retain the offspring as replacements for their flock. No difference in lamb production as a yearling among singletons and twins born to ewe lambs and twins born to mature ewes has been reported, provided the ewe lambs had reached the 60–65% of their likely mature weight prior to breeding at seven to eight months of age. The aim of this experiment was to determine the lamb production from singletons and twins born to ewe lambs and twins born to mature ewes during their first two years of lambing. The experiment included 8-month-old ewes born as twins to mature ewes (M2, n = 135), singletons born to ewe lambs (L1, n = 135), and twins born to ewe lambs (L2, n = 88), bred during the same period to the same rams, over two years. The efficiency of lamb production (total litter weight at weaning divided by the pre-breeding weight of the ewe, for all ewes presented for breeding) after two years of production was not significantly different (p > 0.05) among the groups (0.40 ± 0.02, 0.39 ± 0.02, and 0.39 ± 0.03, for M2, L1, and L2, respectively).
Funder
Beef and Lamb New Zealand
Subject
General Veterinary,Animal Science and Zoology
Reference32 articles.
1. Breeding ewe lambs successfully to improve lifetime performance
2. Foetal programming in sheep – Effects on production
3. Estimation of genetic gain in milk yield by selection in a closed herd of dairy cattle
4. Reproductive peformance of singleton and twin female offspring born to ewe-lamb dams and mature adult ewes;Loureiro;Proc. N. Z. Soc. Anim. Prod.,2016
5. The effect of dam age on ewe offspring productive performance and efficiency;Pain;Proc. N. Z. Soc. Anim. Prod.,2015
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