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Multiple Birth and Sex Ratio in Rahmani Sheep

Animal Production Dept., College of Agr. Alexandria University, Egypt

Abstract

The lambing records of 279 ewes kept on the experimental farm of the College of Agriculture, University of Alexandria, were studied. The effect of year on lambing percentage was highly significant. Summer lambings, from March to August, had more lambs per birth than winter lambings, from September to February, but the difference was not statistically significant. The number of Iambs per birth increased as the ewes increased in age. The maximum was reached at the age of 5 to 7 years. Twin born ewes had more lambs per birth than single born ewes, but the difference was not significant.

The repeatability of number of lambs per birth was .056 using the intraewe correlation for ewes with four lambings from 2 to 7 years of age. The heritability was .08 based on the regression of the type of birth of the offspring on that of the dam. Males were 48.2% of all lambs born.