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The estimation of the intake of grazing sheep II. Application of faecal nitrogen regressions to a group of grazing sheep

Published online by Cambridge University Press:  27 March 2009

G. R. Pearce ,
J. E. Vercoe  and
D. E. Tribe
G. R. Pearce
Affiliation:
Animal Husbandry Research Centre, Werribee, Victoria
J. E. Vercoe
Affiliation:
Animal Husbandry Research Centre, Werribee, Victoria
D. E. Tribe
Affiliation:
School of Agriculture, University of Melbourne, Victoria
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Extract

1. Recordings of faecal organic matter (O.M.), faecal N% (O.M. basis) and live weight, were made over 52 consecutive weekly periods on ten Corriedale wethers grazing a pasture consisting mainly of Wimmera rye-grass (Lolium rigidum Gaud.) with some subterranean clover (Trifolium subterraneum) in a Mediterranean-type environment. The amount of available O.M. and its N% were also recorded.

2. By applying regressions of (i) the ratio of O.M. feed intake to O.M. faecal output on faecal N% and (ii) the N% in the O.M. intake on faecal N%, to the above observations it was possible to estimate the following quantities: O.M. and digestible organic matter (D.O.M.) intake, N and digestible N intake and O.M. digestibility percentage.

3. The patterns of O.M. and D.O.M. intake, and N and digestible N intake are described. Similar patterns exist for each of these quantities. Two maxima, a large one in the spring and a smaller one in the autumn, and two minima, one in the summer and one in the winter, are exhibited. The values for these various maxima and minima are presented in the text.

4. Attention is drawn to variations from the general pattern for these quantities and factors which could influence these patterns are mentioned.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 59 , Issue 3 , November 1962 , pp. 349 - 353
Copyright
Copyright © Cambridge University Press 1962

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References

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