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Effect of fibre level in the diet of the dairy cow on milk yield and composition

Published online by Cambridge University Press:  01 June 2009

F. J. Gordon  and
T. J. Forbes
F. J. Gordon
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough and the Queen's University of Belfast
T. J. Forbes
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough and the Queen's University of Belfast
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Summary

Thirty-six lactating cows were used in a 3×2 factorial design experiment to study the effects of level of energy and fibre intake on milk yield and composition over an 8-week experimental period. Three levels of fibre intake — 1g of crude fibre per 25, 17·5 and 10 kcal of estimated metabolizable energy (ME) requirements — were given in diets supplying both 80 and 100% of energy requirements. The level of energy intake significantly affected milk yield, milk energy output and the percentage solids-not-fat (SNF) and protein in the milk. The effects of fibre intake on both milk yield and milk energy output were marked but not significant. Fibre intake had a significant curvilinear effect on both the SNF and protein in the milk with the highest fibre intake resulting in a significant decrease in both fractions. A significant linear decrease was obtained in the lactose fraction as the fibre intake increased.

The total volatile fatty acid (VFA) level in the rumen was significantly affected by both energy and fibre intake. The level of energy intake only significantly affected the proportion of propionic acid. Fibre intake significantly affected the proportion of both acetic and butyric acids resulting in mean proportions of acetic acid of 66, 70 and 72 at the low, medium and high fibre intakes. The correlations between the rumen acids and lactation efficiencies are also presented.

Multiple regression analysis within each fibre level has been used to partition the ME available for production between that used for milk energy output and liveweight change. The results showed efficiencies of utilization of ME for milk output of 66, 65 and 56 on the low, medium and high fibre diets respectively.

Nitrogen balance data are presented.

Type
Original Articles
Information
Journal of Dairy Research , Volume 38 , Issue 3 , October 1971 , pp. 381 - 391
Copyright
Copyright © Proprietors of Journal of Dairy Research 1971

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References

REFERENCES

Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock, no. 2, Ruminants. London: H.M.S.O.Google Scholar
Balch, D. A. & Rowland, S. J. (1957). Br. J. Nutr. 11, 288.CrossRefGoogle Scholar
Blaxter, K. L. (1959). In Scientific Principles of Feeding Farm Live Stock, p. 21. London: Farmer and Stockbreeder Publications Ltd.Google Scholar
Blaxter, K. L. (1962). The Energy Metabolism of Ruminants. London: Hutchinson.Google Scholar
Blaxter, K. L. (1966). The Feeding of Dairy Cows for Optimal Production. George Scott Robertson Memorial Lecture, Queen’s University, Belfast.Google Scholar
Burt, A. W. A. (1957). Dairy Sci. Abstr. 19, 435.Google Scholar
Castle, M. E., Drysdale, A. D. & Watson, J. N. (1962). J. Dairy Res. 29, 199.CrossRefGoogle Scholar
Coppock, C. E., Flatt, W. P., Moore, L. A. & Stewart, W. E. (1964). J. Dairy Sci. 47, 1359.CrossRefGoogle Scholar
Elliot, J. M. & Loosli, J. K. (1959). J. Dairy Sci. 42, 843.Google Scholar
Emery, R. S., Smith, C. K. & Lewis, T. R. (1958). J. Dairy Sci. 41, 647.CrossRefGoogle Scholar
Gordon, F. J. & Forbes, T. J. (1970 a). Rec. agric. Res., Nth. Ire. 18, 39.Google Scholar
Gordon, F. J. & Forbes, T. J. (1970 b). J. Dairy Res. 37, 481.CrossRefGoogle Scholar
Gordon, F. J. & Forbes, T. J. (1971). Rec. agric. Res., Nth. Ire. (In the Press.)Google Scholar
Hinders, R. G. & Owen, F. G. (1963). J. Dairy Sci. 46, 1246.CrossRefGoogle Scholar
Kleiber, M. (1961). The Fire of Life – An Introduction to Animal Energetics. New York: John Wiley and Sons Inc.Google Scholar
Ling, E. R. (1956). A Text Book of Dairy Chemistry, 3rd edn, vol. 2. London: Chapman and Hall Ltd.Google Scholar
Logan, V. S. & Miles, V. (1963). Can. J. Anim. Sci. 43, 1.CrossRefGoogle Scholar
Lucas, H. L. (1943). J. Dairy Sci. 26, 1011.CrossRefGoogle Scholar
Martin, T. G., Stoddard, G. E. & Allen, R. S. (1954). J. Dairy Sci. 37, 1233.CrossRefGoogle Scholar
Nordfeldt, S., Iwanaga, I., Morita, K., Henke, L. A. & Tom, A. K. S. (1950). J. Dairy Sci. 33, 473.CrossRefGoogle Scholar
Nordfeldt, S. & Ruudvere, A. (1963). LantbrHögsk. Annlr 29, 345.Google Scholar
Raun, N. S. & Burroughs, W. (1962). J. Anim. Sci. 21, 454.Google Scholar
Tsai, Y. C., Castillo, L. S., Hardison, W. A. & Payne, W. J. A. (1967). J. Dairy Sci. 50, 1126.CrossRefGoogle Scholar
Van Es, A. J. H. (1966). 9th Int. Congr. Anim. Prod., Edinburgh, p. 225.Google Scholar
Van Es, A. J. H. & Nijkamp, H. J. (1966). Neth. J. agric. Sci. 14, 178.Google Scholar