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

  • H. Abu Damir (a1), D. Scott (a1), J. K. Thomson (a2), J. H. Topps (a2), W. Buchan (a1) and K. Pennie (a1)...
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.

Copyright
COPYRIGHT: © British Society of Animal Science 1990
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Animal Science
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