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Formaldehyde-treated casein–safflower oil supplement for dairy cows: II. Effect on the fatty-acid composition of plasma and milk lipids

Published online by Cambridge University Press:  01 June 2009

L. J. Cook ,
T. W. Scott  and
Y. S. Pan
L. J. Cook
Affiliation:
C.S.I.R.O., Division of Animal Physiology, Prospect, N.S.W., Australia
T. W. Scott
Affiliation:
C.S.I.R.O., Division of Animal Physiology, Prospect, N.S.W., Australia
Y. S. Pan
Affiliation:
C.S.I.R.O., Division of Animal Genetics, Badgery's Creek, N.S.W., Australia
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Summary

This study reports the effect of feeding formaldehyde-treated or untreated spray-dried casein–safflower oil (1:1, w/w) particles on the fatty-acid composition of milk and plasma lipids of cows.

When the formaldehyde-treated particles were given to Jersey, Sahiwal and Jersey × Sahiwal crossbred cows (1 kg per cow per day) the linoleic acid (18:2) present in the safflower oil was not hydrogenated by the rumen micro-organisms and was incorporated into milk fat.

When the untreated supplement was fed, however, the 18:2 fatty acid was hydrogenated in the rumen and there was an increased proportion of octadecenoic acid (18:1) in the milk fat.

The increased proportions of 18:2 (treated supplement) and 18:1 (untreated supplement) were associated with decreased proportions of palmitic (16:0) and myristic (14:0) acids in the milk fat. All 3 breeds showed similar responses.

The fatty-acid composition of plasma triglycerides, which are an important source of long-chain fatty acids for mammary-gland lipogenesis, was similarly affected. Furthermore, there were significant changes in the fatty-acid composition of other plasma lipids (e.g. phospholipids and cholesteryl esters). The interrelationships between dietary, plasma and milk fatty-acid compositions are discussed.

Type
Research Article
Information
Journal of Dairy Research , Volume 39 , Issue 2 , June 1972 , pp. 211 - 218
Copyright
Copyright © Proprietors of Journal of Dairy Research 1972

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References

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