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Studies on the properties of new zealand butterfat: VI. Comparison of the properties and vitamin A potencies of butterfats produced by clover-fed and ryegrass-fed dairy cows

Published online by Cambridge University Press:  01 June 2009

F. H. McDowall  and
W. A. McGillivray
F. H. McDowall
Affiliation:
The Dairy Research Institute (N.Z.), Palmerston North, New Zealand
W. A. McGillivray
Affiliation:
The Dairy Research Institute (N.Z.), Palmerston North, New Zealand
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Summary

In an indoor feeding trial with three sets of monozygotic twin cows during late spring the effects of H1 short rotation ryegrass and white clover as feeds for the cows on the characteristics and the carotene and vitamin A contents of the butterfat were compared. The butterfat from the cows fed ryegrass had a lower iodine value and refractive index, higher Reichert and saponification values, and lower carotene and vitamin A contents than the butterfat from the cows fed clover. The carotene and vitamin A contents of the blood of the cows fed ryegrass were also lower than those of the cows fed clover

In a subsequent outdoor feeding trial with four sets of monozygotic twins the feeding of pure H1 short rotation ryegrass or of perennial ryegrass was compared with the feeding of mixed pastures containing a high but varying proportion of clover. The results for the spring and early summer months were similar in direction but smaller in magnitude than those from the indoor feeding trial. In the result for the autumn months there was a reversal of the relationship for the characteristics and the carotene and vitamin A contents of the butterfat and for the carotenoid contents of the blood.

It is suggested that the lack of consistency between the spring and autumn results could have been due to differences in the stage of growth of the ryegrass fed and that butterfat characteristics may be influenced more by the stage of maturity than by the botanical composition of the pasture.

Type
Original Articles
Information
Journal of Dairy Research , Volume 30 , Issue 1 , February 1963 , pp. 47 - 57
Copyright
Copyright © Proprietors of Journal of Dairy Research 1963

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References

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