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Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2008;21(1): 1-5.
DOI: https://doi.org/10.5713/ajas.2008.60586    Published online January 4, 2008.
Polymorphism of Growth Hormone GH1-AluI in Jersey Cows and Its Effect on Milk Yield and Composition
C. Dario*, D. Carnicella, F. Ciotola, V. Peretti, G. Bufano
Correspondence:  C. Dario,
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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