牛乳中のβ-ラクトグロブリン型とβ-ラクトグロブリンおよびα-ラクトアルブミン濃度との関係

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タイトル別名
  • Relationships between β-Lactoglobulin Types and the Concentrations of β-Lactoglobulin and α-Lactalbumin in Milk
  • ギュウニュウチュウ ノ ベータ ラクト グロブリンガタ ト ベータ ラクト グ

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抄録

Relationships between β-lactoglobulin (β-Lg) types and the concentrations of β-Lg and α-lactalbumin (α-La) were investigated in milk from eight cattle breeds. The β-Lg and α-La concentratians were measured by the single radial immunadiffusion technique. In all the breeds, it was observed that the mean level of β-Lg concentration was the highest in the β-Lg A/A genotype, intermediate in the A/B genotype and the lowest in the B/B genotype.The mean effects of β-Lg genes for β-Lg concentration were estimated by the method of least squares. The ratio of gene effects of β-LgA to β-LgB (β-LgA/β-LgB)was approximately 1.5. On the other hand, no relations were found between β-Lg genotypes and α-La concentration, and between β-Lg and α-La concentration in individual milk samples. Breed differences were found in β-Lg concentrations estimated from the mean effects of β-Lg genes and the gene frequencies, and in the average concentration of α-La in each breed. The estimated β-Lg concentrations were as follows; Jersey: 0.50%; Japanese Brown: 0.46%; Japanese Polled: 0.43%; Japanese Black: 0.41%; Guernsey: 0.38%; Hereford: 0.36%; Holstein: 0.35%; Japanese Shorthorn: 0.35%. The average α-La concentrations were as follows; Jersey: 0.15%; Japanese Brown: 0.14%; Japanese Polled: 0.10%; Japanese Black: 0.14%; Guemsey: 0.10%; Hereford: 0.13%; Holstein: 0.11%; and Japanese Shorthorn; 0.12%. These results suggest that the concentration of β-Lg in cattle milk is controlled by β-Lg genes, independey from the regulation of the α-La concentration.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 48 (5), 237-242, 1977

    公益社団法人 日本畜産学会

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