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http://dx.doi.org/10.5713/ajas.2008.60586

Polymorphism of Growth Hormone GH1-AluI in Jersey Cows and Its Effect on Milk Yield and Composition  

Dario, C. (Department of Health and Welfare of Animals, University of Studies of Bari- Italy)
Carnicella, D. (Department of Health and Welfare of Animals, University of Studies of Bari- Italy)
Ciotola, F. (University of Catanzaro “Magna Graecia”, Catanzaro -Italy)
Peretti, V. (Department of Animal Science and Food Inspection, University Federico II, Naples - Italy)
Bufano, G. (Department of Health and Welfare of Animals, University of Studies of Bari- Italy)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.21, no.1, 2008 , pp. 1-5 More about this Journal
Abstract
To analyze genetic effects on milk production traits, 164 unrelated Italian Jersey cows reared in 15 farms located in Southern Italy were characterized at the growth hormone locus. Using a Polymerase Chain Reaction-Restriction Fragment Length Polymorphism protocol all three possible genotypes for the Leucine/Valine polymorphism were identified even if in the considered population the number of homozygous animals (Leucine/Leucine = 36; Valine/Valine = 28) was smaller than Leucine/Valine (n = 100) cows; the Hardy-Weinberg equilibrium was verified. Statistical analysis showed that daily milk yield in the Leucine/Leucine genotype was higher (p<0.01) than in Leucine/Valine (22.76 kg vs. 16.96 kg ); cows with Leucine/Valine genotype differed significantly from Leucine/Leucine and Valine/Valine genotypes particularly in fat (4.95% vs. 4.13% and 4.82%, respectively) and protein content (4.00% vs. 3.47% and 3.79%, respectively). No significant effect on lactation length was observed.
Keywords
Growth Hormone; Polymorphism; Jersey; Milk Traits;
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