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The voluntary intake of silage by sheep:I. Interrelationships between silage composition and intake

Published online by Cambridge University Press:  27 March 2009

R. J. Wilkins ,
K. J. Hutchinson ,
R. F. Wilson  and
C. E. Harris
R. J. Wilkins
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
K. J. Hutchinson
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
R. F. Wilson
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
C. E. Harris
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
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Summary

The voluntary intake by sheep of seventy silages was measured in experiments in several years. Linear and multiple regression analyses were made between these voluntary intakes and the contents of dry matter, various acids and nitrogen and the digestibility value determined in vivo. There were some differences in these relationships for silages made from different groups of species, particularly those made from legumes. Voluntary intake was positively correlated with the contents of dry matter, nitrogen, lactic acid as a percentage of total acids and with the Flieg index. Voluntary intake was negatively correlated with the contents of acetic acid and ammonia as a percentage of total N. Although pH alone did not account for a significant part of the variation in intake, multiple regressions in which pH and one of the measurements of fermentation quality were included were significant, with pH positively related to intake. When all silages were considered, the correlation between voluntary intake and the apparent digestibility of dry matter was not significant. However, for legumes this correlation was significant and positive and for grasses other than ryegrass the correlation was significant and negative.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 77 , Issue 3 , December 1971 , pp. 531 - 537
Copyright
Copyright © Cambridge University Press 1971

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