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Chemical composition of milk from a herd of Norwegian goats

Published online by Cambridge University Press:  01 June 2009

Johanne Brendehaug  and
Roger K. Abrahamsen
Johanne Brendehaug
Affiliation:
Department of Dairy and Food Industries, Agricultural University of Norway, 1432 Ås-NLH, Norway
Roger K. Abrahamsen
Affiliation:
Department of Dairy and Food Industries, Agricultural University of Norway, 1432 Ås-NLH, Norway
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Summary

The chemical composition of Norwegian bulk collected goats' milk from the University herd was analysed during one lactation period (30 weeks, 20 samples during 1983). There was considerable variation in chemical composition during the year. Fat content decreased over the first 4 months of lactation and increased during the mountain pasture period. Protein concentration decreased during the first 4 months, and then increased until the end of lactation. Lactose concentration decreased throughout lactation. Casein nitrogen (casein N) was highest at mid lactation and lowest at the beginning and end of lactation. β-Lactoglobulin N showed the opposite trend. Citrate content showed a significantly quadratic decrease and total ash content an increase with advancing lactation. Mutual significant correlations between total P, K, Na, Ca and Mg were calculated, and all increased throughout lactation. There was significant positive correlation between concentrations of individual medium-chain fatty acids and stage of lactation. They remained more or less constant during the first part of the lactation, decreased to minima when the goats were on pasture, and increased during the last phase of lactation. Concentration of C16 fatty acid was negatively correlated with C18 and C18:1. Goat flavour intensity score and quality flavour score were highest at mid lactation, and positively correlated with the acid degree value.

Type
Original Articles
Information
Journal of Dairy Research , Volume 53 , Issue 2 , May 1986 , pp. 211 - 221
Copyright
Copyright © Proprietors of Journal of Dairy Research 1986

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