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Screening of three-way crossbred combination and genetic effect analysis of the SNP in the CLPG gene in meat sheep

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In order to promote the rapid development of the meat sheep industry, a three-way crossbred combination experiment was carried out with Australian White, Dorper, and Charollais sheep as terminal male parents and the elite F1 hybrids of Australian White x Small-tailed Han (Han), Dorper x Han, and Charollais x Han as female parents, which was based on the screening of a two-way crossbred combination in meat sheep. The growth performance of six groups of three-way crossbred combinations and Han lambs was measured and analyzed, and the effect of a polymorphism in the CLPG gene on the growth performance of three-way crossbred lambs was also studied. The results showed that under the same rearing conditions, weight at 3 and 6 months of age and average daily gain from birth to 3 months and from 3 to 6 months of age were all the largest for Australian x (Charollais x Han) crossbred lambs. They were significantly or extremely significant different from the other three-way crossbred combinations and Han lambs (P T) of this gene had two genotypes: CC and CT. Among them, the data of body weights and body sizes from CT genotype individuals at birth, 3 months old, and 6 months old were significantly higher than those of CC genotype individuals, and some indicators showed significant or extremely significant differences (P < 0.05, P < 0.01), suggesting that higher growth performance was observed in individuals with T alleles. To sum up, the crossbred combination of Australian x (Charollais x Han) could be suggested as the optimal choice. The T allele of the CLPG gene showed potential advantages in the performance of meat production in meat sheep. Based on the current results, we recommend that the offspring of Australian x (Charollais x Han) with the T allele should be preferentially utilized for meat sheep production.

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