A total of 129 Limousin calves were used to investigate how leptin gene polymorphisms affect growth traits, such as body weight, average daily gain, wither height, sacrum height and chest girth in beef cattle. Two single nucleotide polymorphisms (SNPs) were genotyped, including the Sau3AI polymorphism in intron 2 and the A59V polymorphism in exon 3. The genotype and allele frequencies for each SNP and the haplotype frequencies for both SNPs were estimated in the studied herd. Statistical analysis revealed that the A59V polymorphism significantly affected the body weight at 210 days of age (P ≤ 0.01) and the average daily gain between 3 and 210 days of age (P ≤ 0.05) with T as a desirable allele. No associations were observed between the Sau3AI polymorphism and the growth traits mentioned above. However, the average daily gain between 3 and 210 days of age was significantly higher in the CT/CT haplotype animals compared with the CC/CC and CC/CT individuals. These results indicated that selection for the A59V TT animals might contribute to an improved body weight in Limousin cattle.
Russian Journal of Genetics – Springer Journals
Published: Jun 19, 2009
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