乳蛋白変異を用いたネパールのヤク,牛,雑種に関する集団遺伝学的研究

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タイトル別名
  • A Population Genetic Study on Yaks, Cattle and Their Hybrids in Nepal Using Milk Protein Variations
  • ニュウ タンパク ヘンイ オ モチイタ ネパール ノ ヤク ウシ ザッシュ ニ

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Milk protein polymorphisms in yaks, cattle and their hybrids in Nepal were examined in order to measure their genetic variability, to do a genetic characterization of cattle, and to test the possibility of gene flow between yaks and cattle. Simultaneous phenotyping by isoelectric focusing detected five molecular types (B, C, E, X and Y) of αS1-casein, two molecular types (A2 and B) ofβ-casein, three molecular types (A, B and X) of κ-casein, two molecular types (A and B) of α-lactalbumin and four molecular types (A, B, E and X) of β-lactoglobulin. The degree of genetic variability within populations measured by average heterozygosity for the milk protein loci was higher in cattle (24-33%) than in yaks (16%). Principal component analysis suggested that yaks were genetically much differentiated from cattle, and that there was substantial genetic differentiation among local populations of cattle in Nepal. In the comparison with cattle breeds in Europe, Japan and India, Nepalese cattle were basically similar to the breeds of Indian cattle. The distribution of three alleles (αS1-CnE, κ-CnX and β-LgE) which were suspected to occur uniquely in yaks showed no possibility of gene flow from yaks to Nepalese cattle through traditional production of hybrids by the Sherpa and other mountain tribes.

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  • 日本畜産学会報

    日本畜産学会報 63 (6), 563-575, 1992

    公益社団法人 日本畜産学会

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