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The pure breeds and crossing have an important role in production. It is  essential in sheep meat production to maintain the genetic diversity of the  adapted breeds, pure breeds and their crosses. Objective of the study is to  determine the impact of genotype and sex on growth traits of lambs. Results  of the study showed that male of all genotypes were dominant on body weight  in all ages (from BWB to BW90). The highest birth weight (BWB) got male of  genotype 2 (W). The lowest body weight at birth was the female lambs of  genotype 1 (P). Body weights at ages 30, 60 and 90 days, male and female of  genotype 4 (PxWxF) were dominant among other genotypes. Genotype 1 (P) of  both sexes had the lowest bodyweights in all ages (BWB, BW30, BW60, BW90).  The result showed better growth efficiency from males compared with females.  The results of fixed factors and its impact on body weights of lambs showed  very significant effect of genotype (P<0.01) on body weights of lambs at  birth (BWB), ages 30, 60 and 90 days (BW30, BW60, BW90). The effect of sex  had highly significant effects (P<0.001) on all ages. The interaction between  genotype x sex showed a very significant effect (P≤0.01) on body weight at  birth (BWB) but were not significant (P≥0.05) on body weights of lambs at  ages BW30, BW60 and BW90. Superiority on growth traits of genotype 4 (PxWxF)  at ages 30, 60 and 90 days, indicating that three-bred crossing resulted in  high growth traits. [Projekat Ministarstva nauke Republike Srbije, br. TR  31053]

Genotype, sex and interaction effect on lamb growth traits