Perinatal mortality and preweaning growth of progeny of ewe lambs Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/k643b4168

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  • Half Polypay ewe lambs were bred to Suffolk, North Country Cheviot and Hampshire rams to lamb at about one year of age. Type of birth-rearing significantly affected mortality by 70 days of age and all weights of lambs from birth to weaning. The mortality rate at 70 days of age of twin born-single raised lambs was three times that of either single born and raised lambs or of twin born and raised lambs. Single born and reared lambs were heavier than twin born and reared lambs, with twin born-single reared lambs being intermediate at all ages. Individual Polypay grand-sires had a significant effect on the standing to suckling interval and on weights of lambs up to 10 days of age. Breed of dam's grand-dam was found to be significant until 60 days of age for weights of lambs. Litter weight at weaning per ewe lambing was not significantly influenced by any effect included in the analysis. Breed of sire was not significant for any of the variables analyzed. This was perhaps a consequence of differences in performance of the rams due to differences of maturity of rams between breed-groups. Phenotypic correlations between time intervals around lambing and weights up to weaning were significant in most cases. A lamb heavier at birth has a longer duration of parturition but is faster to stand and to suckle than a lamb of lighter birth weight. Partial correlations between time intervals and weights to weaning, holding birth weight constant, were non-significant, demonstrating that, for a given birth weight, there is little or no association between preweaning weights and either duration of parturition or lamb vigour at birth.
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