Livestock Studies
1991, Vol 31, Num, 3-4 (Pages: 027-033)
Milk protein polmymorphism and its effect on first lactation milk yield in Jersey
Ceyhan ÖZBEYAZ 1 ,Metin BAYRAKTAR 1 ,Orhan ALPAN 1 ,Abdulkadir AKCAN 1
1 A. Ü. Veteriner Fak., Zoot. Anabilim Dalı. ANKARA
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A total of 210 milk samples of Jersey cows were used to determine ∞ si-casein, Β-casein,
k-casein and Β-lactoglobulin phenolypes and their gene frequencies.
Polyacrylamid-gel tecnique was used to determine milk protein phenolypes. Two alleles were
found in each iocus namely B and C at ∞ si-Cn locus, A and B at Β-Cn, k-Cn and Β-Lg loci. Only the
observed distribution of ∞ si-Cn genolypes differed significantly from the expected.
The highest average milk yield with 2567.3 kg was found and the lowest with 2467.8 kg in the k-
Cn B phenolype. However, the analyses of variance revealed that there was no significant relationship
between milk protein polymorphism and first lactation milk yield.
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