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The relationship between the digestibility of a sward and the herbage consumption of grazing calves

Published online by Cambridge University Press:  27 March 2009

J. Hodgson
J. Hodgson
Affiliation:
Department of Agriculture, University of Leeds
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Summary

Nitro-chalk was applied to S.23 ryegrass swards, at approximately monthly intervals, at two contrasting levels in 1961 and three levels in 1962. Steer calves, 3–6 months old, grazed in rotation round a series of four paddocks on each treatment. Paddocks were trimmed and fertilizer applied after each grazing. The herbage intakes of the calves were determined on three occasions in 1961 and four occasions in 1962. Faecal output was estimated by chromic oxide dilution. In vitro digestibility determinations were carried out on samples of herbage clipped from the swards.

There was a close linear relationship between the digestibility of the herbage and the amount eaten, over the full range of digestibility encountered (68–82%). Regression equations calculated within seasons and fertilizer levels, and within years, did not differ significantly. The regressions of faecal output on herbage digestibility were not significantly different from zero.

The observed relationship between herbage digestibility and herbage intake may reflect (a) the greater sensitivity of young ruminants than adult stock to changes in the digestibility of the diet, and (b) the reduced importance of the chemostatic control of food intake, except at very high levels of digestibility, in young rapidly growing animals.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 70 , Issue 1 , February 1968 , pp. 47 - 51
Copyright
Copyright © Cambridge University Press 1968

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References

Blaxter, K. L., Wainman, F.W. & Wilson, R. S. (1961). The regulation of food intake by sheep. Anim. Prod. 3, 51–61.Google Scholar
Conrad, H. R., Pratt, A. D. & Hibbs, J. W. (1964). Regulation of feed intake in dairy cows. I. Change in importance of physical and physiological factors with increasing digestibility. J. Dairy Sci. 47, 54–62.Google Scholar
Corbett, J. L., Langlands, J. P. & Reid, G. W. (1963). Effects of season of growth and digestibility of herbage on intake by grazing dairy cows. Anim. Prod. 5, 119–29.Google Scholar
Elliott, R. C., Fokkema, K. & French, C. H. (1961). Herbage consumption studies on beef cattle. Rhodesia agric. J. 58, 124–30.Google Scholar
Grassland Research Institute (1961). Research techniques in use at the G.R.I. Hurley Comm. Bur. past. Fid Crops Bull. no. 45.Google Scholar
Hadjipieris, G., Jones, J. G. W. & Holmes, W. (1965). The effect of age and live weight on the feed intake of grazing wether sheep. Anim. Prod. 7, 309–17.Google Scholar
Hodgson, J. & Spedding, C. R. W. (1966). The health and performance of the grazing animal in relation to fertilizer nitrogen usage. I. Calves. J. agric. Sci., Camb. 67, 155–67.Google Scholar
Hodgson, J. & Wilkinson, J. M. (1967). The relationship between live weight and herbage intake in grazing cattle. Anim. Prod. 9, 365–76.Google Scholar
Hutton, J. B. (1963). The effect of lactation on intake in the dairy cow. Proc. N.Z. Soc. Anim. Prod. 23, 39–51.Google Scholar
National Research Council (1958). Nutrient requirements of domestic animals. No. IV. Nutrient requirements of beef cattle. Publ. Nat. Res. Goun., Wash. no. 579.Google Scholar
Osbourn, D. F., Thomson, D. J. & Terry, R. A. (1966). The relationship between voluntary intake and digestibility of forage crops, using sheep. Proc. 10th int. Orassld Congr. pp. 363–6.Google Scholar
Roy, J. H. B. (1959). Calves (dairy and beef). In The Scientific Principles of Feeding Farm Livestock, pp. 48–75. Proc. Brighton Conf. London: Farmer and Stockbreeder Pubs.Google Scholar
Tilley, J. M. A. & Terry, R. A. (1963). A two-stage technique for the in vitrodigestion of forage crops. J. Br. Grassld Soc. 18, 104–11.CrossRefGoogle Scholar
Waite, R., Holmes, W., Campbell, J. I. & Fergusson, D. L. (1950). Studies in grazing management. II. The amount and chemical composition of herbage eaten by dairy cattle under close folding and rotational methods of grazing. J. agric. Sci., Camb. 40, 392–402.Google Scholar