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Efficiencies of use of the metabolisable energy from feeds based on barley or sugar beet feed in immature sheep

Published online by Cambridge University Press:  22 November 2017

G.C. Emmans ,
M.R. Cropper ,
W.S. Dingwall ,
H. Brown ,
J D Oldham  and
J.I. Harland
G.C. Emmans
Affiliation:
Edinburgh School of AgricultureWest Mains Road, Edinburgh EH9 3JG
M.R. Cropper
Affiliation:
Edinburgh School of AgricultureWest Mains Road, Edinburgh EH9 3JG
W.S. Dingwall
Affiliation:
Edinburgh School of AgricultureWest Mains Road, Edinburgh EH9 3JG
H. Brown
Affiliation:
Edinburgh School of AgricultureWest Mains Road, Edinburgh EH9 3JG
J D Oldham
Affiliation:
Edinburgh School of AgricultureWest Mains Road, Edinburgh EH9 3JG
J.I. Harland
Affiliation:
British Sugar PLC, Oundle Road, Peterborough PE2 9QU
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Extract

The ARC (1980) energy system sees growth in the single dimension of energy retention (ER) which increases, with diminishing marginal efficiency, as ME intake increases. The quantitative relationship between ME intake and ER is predicted from q, the proportion of the gross energy which is metabolisable. An experiment on growing sheep on controlled feeding of different feeds was carried out to provide data suitable for testing ARC (1980) and other energy systems.

Scottish Blackface wether sheep in single pens, entered the experiment at 25 kg liveweight (LW), when 11 were slaughtered. The remainder were allocated to 3 x 3 x 3 treatments with an intended 4 replicates per treatment. The factors were (i) feeds: feeds B, U and M shown in Table 1, (ii) levels of feeding. L, M and H where H was 936 g/d at 25 kg and was increased by 52 g/d each week, L was half H and M half-way between L and H, (iii) slaughter point, after 9 or 18 weeks, or at 40 kg liveweight.

Type
Lamp Nutrition and Growth
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1989 , March 1989 , pp. 60
Copyright
Copyright © British Society of Animal Production 1989

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