Association of leptin genotypes with beef cattle characteristics

Area of Science:

• Animal Genetics and Breeding
• Quantitative Trait Loci (QTL) Analysis
• Livestock Production Systems

Background:

• A single nucleotide polymorphism (SNP) in the bovine leptin gene (p.Arg25Cys) is associated with carcass traits.
• Understanding genetic factors influencing fat deposition is crucial for improving animal efficiency and meat quality.

Purpose of the Study:

• To investigate the impact of the bovine leptin SNP (C/T) on backfat thickness and body weight in a large cattle population.
• To evaluate the relationship between specific genotypes and the rate of fat accretion.

Main Methods:

• Genotyping of 136,286 cattle.
• Analysis of backfat measurements in 92,112 animals and body weight in 53,189 animals.
• Statistical analysis to determine the association between the leptin SNP (C/T) and phenotypic traits.

Main Results:

• A significant positive correlation was found between the T allele frequency and backfat thickness (P < 0.0001).
• TT genotype animals exhibited the highest backfat (6.79 mm), followed by CT (6.49 mm) and CC (6.28 mm).
• TT genotype cattle reached 12 mm backfat accretion faster (38 days) than CT (42 days) and CC (45 days) genotypes. Body weight was also significantly associated with genotype (P < 0.0001).

Conclusions:

• The bovine leptin p.Arg25Cys SNP significantly affects backfat accretion and body weight in cattle.
• The T allele is associated with increased fat deposition and potentially faster growth rates, influencing key market characteristics.
• This SNP holds potential for marker-assisted selection to improve economically important traits in cattle breeding programs.