Abstract

The objective of this study was to determine the non-genetic factors which a ect growth traits in Dorper lambs under intensive conditions. Nine hundred and ninety birth weight records and 851 weaning weight data from a commercial sheep farm were used. A model containing the e ects of year of birth, season of birth, litter size, dams' age and gender was used for identi cation of factors a ecting growth traits. Birth weight was highest (p < 0.05) in summer and lowest in winter and spring. Male lambs excelled females in birth weight, weaning weight, and average daily gain. Young dams produced o spring with a lower (p < 0.05) birth weight and weaning weight than older ewes As a conclusion, important in uences of environmental factors on growth traits were identi ed for Dorper lambs.

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