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The effect of the periodic feeding of linseed oil on the production and iodine value of milk fat

Published online by Cambridge University Press:  01 June 2009

J. C. Wadsworth
J. C. Wadsworth
Affiliation:
Dairy Research Unit, University Farms, Camden, N.S.W., 2570, Australia
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Summary

A study was made of the changes in the iodine value of milk fat from cows following the feeding of linseed oil (450g) at intervals of 6 days. Three cows in midlactation and of differing age and breed were used. The experiment consisted of a series of 3 collection periods, each of 6 days' duration, with 12 days between periods. Three doses of oil were given (6 days apart) between periods 1 and 2, the last dose of oil being given immediately before the start of period 2. The mean iodine values for the 3 periods were 35·5, 40·5 and 34·7 respectively. There was a distinct pattern of change in iodine value with time after feeding the oil, a maximum of 45·5 being attained on the second day with a subsequent decline to 38·5 on the sixth day. Analysis of variance showed that these effects were significant and due to oil-feeding, whereas changes in yield and content of fat and production of milk could be accounted for by normal decline in lactation. It was concluded that the periodic feeding of a large dose of linseed oil produces a significant increase in the iodine value of milk fat and avoids the possible disadvantages of continuous fat supplementation.

Type
Original Articles
Information
Journal of Dairy Research , Volume 37 , Issue 2 , June 1970 , pp. 181 - 186
Copyright
Copyright © Proprietors of Journal of Dairy Research 1970

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