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Validation of advisory models for the prediction of voluntary intake of grass silage by lambs and dairy cows

Published online by Cambridge University Press:  20 November 2017

N.W. Offer ,
C. Thomas  and
R.J. Dewhurst
N.W. Offer
Affiliation:
SAC, Auchincruive, Ayr, KA6 5HW
C. Thomas
Affiliation:
SAC, Auchincruive, Ayr, KA6 5HW
R.J. Dewhurst
Affiliation:
IGER, Aberwystwyth, SY23 3EB
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Extract

Inaccurate prediction of silage intake is a major source of error in ration calculation. New routine methods such as electrometric titration (ET) and near infra-red reflectance spectroscopy (NIRS) have the potential to improve silage intake prediction (Offer et al., 1994). Development of new advisory models is slow because of the need to do large numbers of intake measurements. It is also essential that models are blind-tested (validated) on data not used for calibration. At SAC, sufficient animal intake data is now available for both calibration and validation although it is intended to continue to accumulate data for these purposes.

Type
Silage
Information
Proceedings of the British Society of Animal Science , Volume 1995 , March 1995 , pp. 22
Copyright
Copyright © The British Society of Animal Science 1995

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References

Offer, N.W., Dewhurst, R.J. and Thomas, C. (1994). The use of electrometric titration to improve the routine prediction of silage intake by lambs and dairy cows. Anim. Prod. 58: 427a Google Scholar
Rook, A.J., Dhanoa, M.S. and Gill, M (1990). Prediction of the voluntary intake of grass silages by beef cattle. Anim. Prod. 50: 455–466.Google Scholar