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The effect of a change in blood acid-base status on body composition and mineral retention in growing lambs

Published online by Cambridge University Press:  02 September 2010

H. Abu Damir ,
D. Scott ,
J. K. Thomson ,
J. H. Topps ,
W. Buchan  and
K. Pennie
H. Abu Damir
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
D. Scott
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
J. K. Thomson
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
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

Three groups of lambs of about 25 kg live weight were given a concentrate diet either on its own (eight lambs) or supplemented with 10 g/kg ammonium chloride (eight lambs) or 20 g/kg sodium bicarbonate (12 lambs). At about 45 kg live weight the lambs were killed and their body composition was determined. The composition of their gains was also determined using information obtained from a fourth group of lambs (eight lambs) which were killed at the start of the experiment. Lambs given the ammonium chloride diet showed a reduction in blood pH while those given the sodium bicarbonate diet showed an increase to levels seen in lambs given forage diets. There were also marked effects on calcium (Ca), phosphorus (P) and magnesium retention with retentions being reduced in those given the ammonium chloride diet and increased in those given the bicarbonate diet. The average rates of retention of Ca and P in lambs given the bicarbonate diet were 9·1 and 5·9 g/kg empty-body weight gain and are comparable with rates seen in lambs given forage diets. These results suggest that dietary induced changes in blood acid-base status is a major factor contributing to the lower rates of retentions of these minerals in lambs given cereal-based diets.

Keywords

acid base equilibriumbody compositioncalciumlambsphosphorus
Type
Research Article
Information
Animal Production , Volume 51 , Issue 3 , December 1990 , pp. 527 - 534
Copyright
Copyright © British Society of Animal Science 1990

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