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The effects of dietary soybean oil on milk-fat composition in the cow

Published online by Cambridge University Press:  01 June 2009

W. Steele ,
R. C. Noble  and
J. H. Moore
W. Steele
Affiliation:
The Hannah Dairy Research Institute, Ayr, Scotland
R. C. Noble
Affiliation:
The Hannah Dairy Research Institute, Ayr, Scotland
J. H. Moore
Affiliation:
The Hannah Dairy Research Institute, Ayr, Scotland
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Summary

The effects of the isocaloric replacement of starch in a low-fat concentrate mixture by 8% soybean oil on the yield and composition of milk fat were investigated in a feeding experiment with 6 cows in mid lactation. Two high-fat concentrate mixtures were given to the cows. In one the requisite amount of soybean oil was given by including 50% coarsely ground soybeans in the concentrate mixture. In the other an equal amount of soybean oil was added directly to the concentrate mixture. The concentrate mixtures were given with a high-roughage diet that supplied 5·5kg hay and 2·7kg of sugar-beet pulp/day.

When the 2 high-fat rations were given to the cows there were reductions in the percentages and yields of 10:0, 12:0, 14:0, 14:1, 16:0 and 16:1 fatty acids and increases in the concentrations and yields of 18:0, 18:1 and 18:2 fatty acids in the milk fat. The direct addition of the soybean oil to the diet also reduced the percentage and yield of 6:0 and 8:0 whilst the inclusion of the soybeans increased the percentage of 4:0 and the yields of 4: 0 and 6:0 in the milk fat.

When both high-fat rations were given to the cows there were increases in the yields and concentrations of as-9–18:1 in the milk fat, whilst inclusion of the soybean oil in the diet increased also the concentration and yield of trans-11–18:1.

The implications of these findings are discussed.

Type
Original Articles
Information
Journal of Dairy Research , Volume 38 , Issue 1 , February 1971 , pp. 49 - 56
Copyright
Copyright © Proprietors of Journal of Dairy Research 1971

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References

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