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Estimation of food intake in sheep by blood assay for lithium content following ingestion of lithium labelled food

Published online by Cambridge University Press:  20 November 2017

J.E. Vipond ,
G. Horgan  and
D. Anderson
J.E. Vipond
Affiliation:
Genetics and Behavioural Sciences Department, SAC West Mains Road, Edinburgh EH9 3JG
G. Horgan
Affiliation:
Scottish Agricultural Statistics Service, University of Edinburgh Edinburgh EH9 3JZ
D. Anderson
Affiliation:
Genetics and Behavioural Sciences Department, SAC West Mains Road, Edinburgh EH9 3JG
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Extract

Current rationing systems for sheep and cattle aim to balance a deficit in a basal roughage diet by giving group-fed animals a fixed amount of supplementary food. Assumptions are made that both the intake of basal diet and supplementary feed are average values. Coefficients of variation in individual intake of supplementary feeds of 16-36% have however been observed (Foot and Russel, 1973; Foot et al, 1973) and this variation may be larger (67-107%) where supplements are available as feed blocks (Kendall et al, 1983; Ducker et al, 1981).

Recent work on the selection of feed ingredients by sheep (Kyriazakis and Oldham, 1993) and the effect of physiological factors such as parasitism on diet selection (Kyriazakis et al, 1994) suggest that there may be biological mechanisms behind this variation. Estimation of intake of supplements has been difficult in the past, particularly at pasture using chronic oxide and N-alkane indigestible marker systems owing to the need for complete faecal collection procedures and handling procedures that disrupt grazing. A promising new method using lithium as a marker has been developed in Australia (Nolan et al, 1994). This work was undertaken to evaluate the lithium technique for use under UK conditions to elucidate causes of variation in supplement intake of sheep.

Type
Ruminant Nutrition
Information
Proceedings of the British Society of Animal Science , Volume 1995 , March 1995 , pp. 16
Copyright
Copyright © The British Society of Animal Science 1995

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References

Ducker, M.J., Kendall, P.T., Hemmingway, R.G. and McClelland, T.H. (1981). An evaluation of feed blocks as a means of providing supplementary nutrients to ewes grazing upland/hill pastures. Animal Production 33: 51–57.Google Scholar
Foot, J.Z. and Russel, A.J.F. (1973). Some nutritional implications of group-feeding hill sheep. Animal Production 16: 293–302.Google Scholar
Foot, J.Z., Russel, A.J.F., Maxwell, T.J. and Morris, P. (1973). Variation in intake among group-fed pregnant scottish blackface ewes given restricted amounts of feed. Animal Production 17: 169–178.Google Scholar
Kendall, P.T., Ducker, M.J. and Hemmingway, R.G. Individual intake variation in ewes given feed blocks or trough supplements indoors or at winter grazing. Animal Production 36: 7–20.Google Scholar
Kyriazakis, I. and Oldham, J.D. (1993). Diet selection in sheep: the ability of growing lambs to select a diet that meets their crude protein (nitrogen x 6.25) requirements. British Journal of Nutrition 69: 617–629.10.1079/BJN19930064CrossRefGoogle ScholarPubMed
Kyriazakis, I., Oldham, J.D., Coop, R.L. and Jackson, F. (1994). The effect of subclinical intestinal nematode infection on the diet selection of growing sheep. British Journal of Nutrition 72: 665–677.10.1079/BJN19940070CrossRefGoogle ScholarPubMed
Nolan, J.V., Thomas, J.A. and Hill, M.K. (1993). Improvements in growth and wool production of winter grazed merino wethers when offered a protein-rich supplement. Animal Production 56: 448.Google Scholar