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Utilization of dried microbial cells grown on methanol in a semi-purified diet for growing pigs

Published online by Cambridge University Press:  09 March 2007

J. P. F. D'Mello ,
D. G. Peers  and
C. T. Whittemore
J. P. F. D'Mello
Affiliation:
School of Agriculture, University of Edinburgh, West Mains Road, Edinburgh EH9 3JG
D. G. Peers
Affiliation:
School of Agriculture, University of Edinburgh, West Mains Road, Edinburgh EH9 3JG
C. T. Whittemore
Affiliation:
School of Agriculture, University of Edinburgh, West Mains Road, Edinburgh EH9 3JG
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Abstract

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1. Twenty-four pigs (mean body-weight 44 kg) were used to determine the digestibilities of energy, nitrogen and amino acids in dried microbial cells (DMC) grown on methanol and in white fish meal (WFM). N utilization and the excretion of various nitrogenous compounds were also studied.

2. Semi-purified diets containing DMC, WFM or no protein source were offered at the rate of 1 kg fresh food/d. Daily N intakes were 26.5, 24.7 and 0.65 g respectively.

3. Mean metabolic faecal N determined with the protein-free diet was 1.11 g/d (1.26 g/kg dry matter (dm) eaten) for the two experiments. The corresponding endogenous urinary N value was 2.91 g/d.

4. Daily urinary N output of pigs given the diet with WFM was significantly greater than that of pigs given the diet with DMC, with the result that N retention, net protein utilization and biological value were higher for pigs given DMC.

5. Apparent and true digestibility of amino acids were higher for the diet with DMC than for the diet with WFM.

6. N excretion in the form of ammonia, urea, uric acid and allantoin accounted for 81, 91 and 99% of the total N excreted by the groups given the protein-free diet, DMC and WFM respectively. Pigs given DMC excreted greater quantities of allantoin-N and less urea-N than pigs given WFM.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 36 , Issue 3 , November 1976 , pp. 403 - 410
Copyright
Copyright © The Nutrition Society 1976

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