Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-12-02T22:31:05.813Z Has data issue: false hasContentIssue false
  • English
  • Français

Some effects of unsaturated oils given to dairy cows with rations of different roughage content

Published online by Cambridge University Press:  01 June 2009

J. W. G. Nicholson  and
J. D. Sutton
J. W. G. Nicholson
Affiliation:
Canada Department of Agriculture, Research Station, Fredericton, N.B., Canada
J. D. Sutton
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
Get access Rights & Permissions [Opens in a new window]

Summary

Three experiments were conducted to determine the effect of feeding polyunsaturated fish oils to dairy cows receiving rations of high, medium or low roughage content. In the rumen, the decreases in the proportion of acetic acid and increases in propionic acid induced by the oils became greater as the amount of oil given was increased but the magnitude of the response to any dose depended upon the composition of the basal diet. The effects on volatile fatty acids (VFA) proportions of small amounts of the oils (125–150 ml/day) were greatest with the low-roughage rations. With large doses of oil (375–450 ml/day) the responses were variable but it is concluded that, in general, changes in VFA proportions are least with low-roughage rations.

The fat content of milk was more sensitive to dietary oil supplementation than were the rumen VFA proportions. When the unsaturated oils were given there was a decrease in milk fat percentage and an increase in the proportion of unsaturated fatty acids in the fat; there was also increased incorporation of fatty acids with more than 18 carbon atoms in the milk fat. The metabolism in the rumen tended to become adapted to the feeding of 150 ml/day of oil, the VFA pattern returning during the second and third week of supplementation to that observed before the addition of oil.

Type
Original Articles
Information
Journal of Dairy Research , Volume 38 , Issue 3 , October 1971 , pp. 363 - 372
Copyright
Copyright © Proprietors of Journal of Dairy Research 1971

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Beitz, D. C. & Davis, C. L. (1964). J. Dairy Sci. 47 1213.CrossRefGoogle Scholar
Broster, W. H., Sutton, J. D., Tuck, V. J. & Balch, C. C. (1965). J. agric. Sci., Camb. 65, 227.CrossRefGoogle Scholar
Brown, W. H., Stull, J. W. & Stott, G. H. (1962). J. Dairy Sci. 45, 191.CrossRefGoogle Scholar
Czerkawski, J. W., Blaxter, K. L. & Wainman, F. W. (1966). Br. J. Nutr. 20, 485.CrossRefGoogle Scholar
Davis, C. L. & Brown, R. E. (1970). In Physiology of Digestion and Metabolism in the Ruminant, p. 545. (Ed. Phillipson, A. T..) Newcastle: Oriel Press.Google Scholar
Deman, J. M. (1964). J. Dairy Sci. 47, 546.CrossRefGoogle Scholar
Demeyer, D. I., Van nevel, C. J., Henderickx, H. K. & Martin, J. (1969). In Energy Metabolism of Farm Animals, p. 139. (Eds Blaxter, K. L., Kielanowski, J. and Thorbek, Greta.) Newcastle: Oriel Press.Google Scholar
Hilditch, T. P. & Thompson, H. M. (1936). Biochem. J. 30, 677.CrossRefGoogle Scholar
Moore, L. A., Hoffman, G. T. & Berry, M. H. (1945). J. Dairy Sci. 28, 161.CrossRefGoogle Scholar
Nicholson, J. W. G., Cunningham, H. M. & Friend, D. W. (1963). Can. J. Anim. Sci. 43, 309.CrossRefGoogle Scholar
Petersen, W. E. (1932). J. Dairy Sci. 15, 283.CrossRefGoogle Scholar
Shaw, J. C. & Ensor, W. L. (1959). J. Dairy Sci. 42, 1238.CrossRefGoogle Scholar
Storry, J. E., Hall, A. J., Tuckley, B. & Millard, D. (1969). Br. J. Nutr. 23, 173.CrossRefGoogle Scholar
Sutton, J. D. & Johnson, V. W. (1969). J. agric. Sci., Camb. 73, 459.CrossRefGoogle Scholar