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Estimation of herbage intake from nitrogen, copper, magnesium and silicon concentrations in faeces

Published online by Cambridge University Press:  27 March 2009

W. R. McManus ,
M. L. Dudzinski  and
G. W. Arnold
W. R. McManus
Affiliation:
School of Wool Technology, University of New South Wales, Kensington, N.S.W.
M. L. Dudzinski
Affiliation:
Division of Mathematical Statistics, C.S.I.R.O., Canberra, A.C.T.,
G. W. Arnold
Affiliation:
Division of Plant Industry, C.S.I.R.O., Western Australian Laboratories, Perth, W.A.
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Extract

1. Data from eleven forages fed in digestibility trials were used to obtain statistical relations between organic matter intake (I), faecal dry matter output (F) and the concentration of nitrogen (N), copper (Cu), magnesium (Mg) and silicon (Si) in faecal dry matter.

2. Exploration of multiple regressions using all variables, and their products, gave a prediction relationship with four variables that was slightly better than that for nitrogen alone, as obtained by Arnold & Dudzinski (1963). FN and the products of(FN × FCu) and (FN × FSi) were the contributing variables. The eleven forages could not be brought into a single expression.

Information

Type
Research Article
Information
The Journal of Agricultural Science , Volume 69 , Issue 2 , October 1967 , pp. 263 - 270
Copyright
Copyright © Cambridge University Press 1967

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