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Effect of growth rate on mineral retention and body composition of growing lambs

Published online by Cambridge University Press:  02 September 2010

M. Wan Zahari ,
J. K. Thompson ,
D. Scott ,
J. H. Topps ,
W. Buchan  and
K. Pennie
M. Wan Zahari
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
J. K. Thompson
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
D. Scott
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
J. H. Topps
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
W. Buchan
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
K. Pennie
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

Groups of wether lambs were grown at different rates from about 24 kg live weight to 50 kg, by feeding them different amounts of the same concentrate diet. The slow growing lambs had higher contents of protein, ash, calcium (Ca), and phosphorus (P), and less fat and magnesium (Mg) than other groups. Differences in composition were significant between slow (120 g/day) and fast growth (230 g/day; P < 0-05) but not always between intermediate (160 g/day) and other growth rates. The differences became small and insignificant when data were expressed on a fat-free basis except for Mg which decreased with slow growth. Ash, for example, increased from 47 g/kg fat-free gain with fast growing animals to 54 g/kg with slow growth. Mg decreased from 0·44 g/kg fat-free gain with fast growth to 0·24 g/kg with slow growth. The data support the view that the ratio of ash to fat-free empty-body increases only slightly with age.

The basic diet contained 3·9 g Ca per kg dry matter and the effect of a substantial supplement of calcium carbonate on lambs growing at the fast rate was to increase their retentions of ash, Ca and P by a factor greater than 1·25. There are alternative explanations for this finding. One possibility is that the availability of Ca in the basic diet had been reduced by unknown factors. It is also possible that the supplementary carbonate altered the acid/base status of the animals and resulted in conditions which favoured skeletal mineralization.

Type
Research Article
Information
Animal Production , Volume 49 , Issue 3 , December 1989 , pp. 443 - 450
Copyright
Copyright © British Society of Animal Science 1989

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