Association between leu127val polymorphism of growth hormone gene and milk yield of polish red cattle

Urszula Kaczor, Magdalena Mazur, Joanna Podwika, Joanna Makulska, Anna Kozubska-Soboci?ska

Identification of Leu127Val (Alu I) polymorphism in growth hormone (GH) locus in Polish Red cattle was carried out using PCR-RFLP technique. The following distribution of genotypes was found: Leu/Leu 0.574, Leu/Val 0.408, Val/Val 0.018. Due to a very low frequency of Val/Val genotype this genotype was excluded from the analyses. The GHL allel frequency was 0.774. The relationship between Leu127Val polymorphism and milk performance traits was studied based on the data obtained from the first lactation and data from the first three lactations was pooled. In the first lactation the cows with Leu/Leu genotype were characterized by 0.15% higher protein content in milk (p?0.05) compared with cows with Leu/Val genotype. The genotype did not affect the yield of: milk, protein and fat as well as fat content in milk.

Download full text in PDF format