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CSN1S1 variants are highly associated with milk performance traits in Lacaune sheep
Milk samples (n=296) of Lacaune (LAC) sheep were analysed for milk protein variability at protein level by isoelectric focusing and at DNA-level by different DNA-based tests. Isoelectric focusing of all milk samples led to the identification of the alphas1-casein (αs1-CN; CSN1S1) alleles C and H, αs2-CN (CSN1S2) A, B, and C, as well as beta‑lactoglobulin (β-LG; LGB) A and B. DNA-based tests differentiated αs1-CN C into CSN1S1*C’ and C’’ and typed for CSN1S2*G. Associations between milk performance traits and milk protein alleles and genotypes analysed using 150-day-lactation data showed significant effects of milk protein alleles and genotypes on protein content whereas CSN1S1*C’’is the favourable allele.
Keywords:
sheep
milk
genetic variants
milk performance
