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The prediction of voluntary intake of grazing dairy cows

Published online by Cambridge University Press:  27 March 2009

Lindsey Caird  and
W. Holmes
Lindsey Caird
Affiliation:
Wye College, (University of London), Ashford, Kent
W. Holmes
Affiliation:
Wye College, (University of London), Ashford, Kent
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Summary

Information on the total organic matter intake, concentrates supplied (C), live weight (LW), week of lactation (WL), milk yield (MY), herbage organic matter digestibility (HOMD), herbage mass, sward height (SHT) or herbage allowance (HAL) measured individually for 357 cows at one of three sites was assembled. Observed intake was compared with intakes predicted by existing intake equations and new prediction equations based on regression models or regression and least-squares constants were developed. Major factors affecting intake were MY, LW, WL, C and HAL or SHT. Although HOMD was correlated with intake, better predictions were obtained when HOMD was omitted. There were differences between sites possibly associated with differences in measurement techniques.

The predictive value of some existing equations and new equations were tested against independent sets of data. A simple equation (A) based on MY and LW (Ministry of Agriculture, Fisheries and Food, 1975) gave satisfactory average predictions but the mean square prediction error (MSPE) was high. The equations of Vadiveloo & Holmes (1979) adjusted for bias gave a relatively low MSPE. The preferred new equations for grazing cattle included MY, LW, WL, C and HAL or SHT, and their MSPE were similar to or lower than for indoor equations.

The discussion indicates that a simple equation (A) would give adequate predictions for farm planning. The more detailed equations illustrate the inter-relations of animal with sward conditions and concentrate allowances. Predicted intakes may deviate from actual intakes because of short-term changes in body reserves.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 107 , Issue 1 , August 1986 , pp. 43 - 54
Copyright
Copyright © Cambridge University Press 1986

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References

REFERENCES

Arriaga-Jordan, C. M. (1985). Studies on the response to supplementation of dairy cows at pasture. Ph.D. thesis, University of London.Google Scholar
Arriaga-Jordan, C.M. & Holmes, W. (1986). The effect of cereal concentrate supplementation on the digestibility of herbage-based diets for lactating dairy cows. Journal of Agricultural Science, Cambridge 106, 581–592.CrossRefGoogle Scholar
Baker, R. D. (1982). Estimating herbage intake from animal performance. In Herbage Intake Handbook (ed. Leaver, J. D.), ch. 3. Hurley: British Grassland Society.Google Scholar
Brown, C. A., Chandler, P. T. & Holter, J. B. (1977). Development of predictive equations for milk yield and dry matter intake in lactating cows. Journal of Dairy Science 60, 1739–1754.CrossRefGoogle Scholar
Combellas, J. (1977). Studies on the herbage intake and milk yield of dairy cows. Ph.D. thesis, University of Reading.Google Scholar
Combellas, J. & Hodgson, J. (1979). Herbage intake and milk production by grazing dairy cows. I. The effects of variation in herbage mass and daily herbage allowance in a short term trial. Grass and Forage Science 34, 209–214.CrossRefGoogle Scholar
Curran, M. K. & Holmes, W. (1970). Prediction of the voluntary intake of food by dairy cows. 2. Lactating grazing cows. Animal Production 12, 213–224.Google Scholar
Dixon, W. J., Brown, M. B., Engelman, L., Frane, J. W., Hill, M. A., Jennrich, R. I. & Toporeck, J. D. (1981). Biomedieal program (BMDP). Statistical software. Berkeley, Los Angeles: University of California Press.Google Scholar
Frame, J. (1981). Herbage mass. In Sward Measurement Handbook (ed. Hodgson, J., Baker, R. D., Davies, Alison, Laidlaw, A. S. and Leaver, J. D.). Hurley: British Grassland Society.Google Scholar
France, J. & Thornley, J. H. M. (1984). Mathematical Models in Agriculture: a Quantitative Approach to Problems in Agriculture and Related Sciences. London: Butterworth.Google Scholar
Holmes, W. & Jones, J. G. W. (1964). The efficiency of utilization of fresh grass. Proceedings of the Nutrition Society 23, 88–99.CrossRefGoogle ScholarPubMed
Jennings, P. G. & Holmes, W. (1984). Supplementary feeding of dairy cows on continuously stocked pasture. Journal of Agricultural Science, Cambridge 103, 161–170.CrossRefGoogle Scholar
Le Du, Y. L. P. & Penning, P. D. (1982). Animal based techniques for estimating herbage intake. In Herbage Intake Handbook (ed. Leaver, J. D.). Hurley: British Grassland Society.Google Scholar
Leaver, J. D., Campling, R. C. & Holmes, W. (1969). The influence of flexible and rigid grazing management and of supplementary feed on output perhectare and per cow. Animal Production 11, 161–172.Google Scholar
Lewis, M. (1981). Equations for predicting silage intake by beef and dairy cattle. Proceedings of the Sixth Silage Conference, Edinburgh, 1981, pp. 35–36.Google Scholar
Meijs, J. A. C. & Hoekstra, J. A. (1984). Concentrate supplementation of grazing dairy cows. 1. Effect of concentrate intake and herbage allowance on herbage intake. Grass and Forage Science 39, 59–66.CrossRefGoogle Scholar
Milne, J. A., Maxwell, T. J. & Souter, W. (1981). Effect of supplementary feeding and herbage mass on the intake and performance of grazing ewes in early lactation. Animal Production 32, 185–195.Google Scholar
Ministry of Agriculture, Fisheries and Food (1975). Energy allowances and feeding systems for ruminants. Technical Bulletin 33, London: H.M.S.O.Google Scholar
Neal, H. D. St. C., Thomas, C. & Cobby, J. M. (1984). Comparisons of equations for predicting voluntary intake by dairy cows. Journal of Agricultural Science, Cambridge 103, 1–10.CrossRefGoogle Scholar
Neilson, D. R., Whittemore, C. T., Lewis, M., Parkinson, H., Hodgson-Jones, L. S. & Prescott, J. H. D. (1981). Feed intake equations for high yielding dairy cows given a complete diet. Animal Production 32, 366 (abstract).Google Scholar
Osbourn, D. F. (1982). The feeding value of grass and grass products. In Grass, its Production and Utilization (ed. Holmes, W.), ch. 3. Oxford: Blackwell.Google Scholar
Stockdale, C. R. (1985). Influence of some sward characteristics on the consumption of irrigated pastures grazed by lactating dairy cattle. Grass and Forage Science 40, 31–39.CrossRefGoogle Scholar
Vadiveloo, J. & Holmes, W. (1979). The prediction of the voluntary feed intake of dairy cows. Journal of Agricultural Science, Cambridge 93, 553–562.CrossRefGoogle Scholar
Van Es, A. J. H. (1974). Energy intake and requirement of cows during the whole year. Livestock Production Science 1, 21–32.CrossRefGoogle Scholar
Wallace, L. R. (1956). Intake and utilisation of pasture by grazing dairy cattle. Proceedings of VII International Grassland Congress 1, 196–204.Google Scholar