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The composition of whole casein from the milk of Ayrshire cows

Published online by Cambridge University Press:  01 June 2009

D. T. Davies  and
A. J. R. Law
D. T. Davies
Affiliation:
The Hannah Research Institute, Ayr, Scotland, KA6 5HL
A. J. R. Law
Affiliation:
The Hannah Research Institute, Ayr, Scotland, KA6 5HL
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Summary

The composition of whole casein of 5 herd-bulk and 42 individual-cow milks from a single herd of Ayrshire cows has been determined. The percentage composition of the herd-bulk samples varied relatively little over a period of more than a year with the whole casein consisting on average of 38·4 % αs1,0-casein, 36·5 % β-casein, 12·5 % κ-casein, 10·5 % minor αs-caseins and 2·1 % γ-casein. For the individual-cow samples from mid-lactation, casein composition also was relatively constant, but in early and late lactation composition varied more with the relative amount of β-casein often being lower and those of κ- and γ-caseins often higher than in mid-lactation, these differences tending to be more marked in samples from older cows. Stage of lactation appeared to have little effect on the relative amounts of αs1,0-and minor αs-caseins.

The concentrations of all casein fractions were significantly positively correlated (P < 0·001) with the concentration of whole casein in the milk. Also, there were significant negative correlations (P < 0·001) between the percentages of whole casein present as β- and κ-caseins, β- and γ-caseins and minor αs- and γ-caseins, and a significant positive correlation (P < 0·001) between the relative amounts of κ- and γ-caseins. The relative amount of the major αs1,0-casein fraction, however, was not closely related to those of any of the other fractions.

Generally, milks with high lactose and low Na values yielded casein which was comparatively rich in β-casein and comparatively poor in κ- and γ-caseins.

Type
Original Articles
Information
Journal of Dairy Research , Volume 44 , Issue 3 , October 1977 , pp. 447 - 454
Copyright
Copyright © Proprietors of Journal of Dairy Research 1977

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