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Nitrogen utilization of growing-finishing Barbados Blackbelly lambs

Published online by Cambridge University Press:  27 March 2009

P. O. Osuji  and
C. Devers
P. O. Osuji
Affiliation:
Caribbean Agricultural Research and Development Institute, University of the West Indies, St Augustine, Trinidad
C. Devers
Affiliation:
Caribbean Agricultural Research and Development Institute, University of the West Indies, St Augustine, Trinidad
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Summary

Twelve 6–8 months old male Barbados Blackbelly lambs were used in a 4 × 4 latin square experiment with three replicates to study the utilization of diets made from local by-products and containing 64, 93, 125 or 143 g crude protein/kg D. M.

Both dry-matter (mean 750·1 g/day) and digestible-energy (mean 6·2 MJ DE/day) intakes, and their digestibility coefficients increased, though not significantly, with increasing dietary protein concentration. However, nitrogen digestibility, urinary-nitrogen output and nitrogen retention all increased significantly (P < 0·01) with increasing dietary protein concentration.

Metabolic faecal nitrogen and endogenous urinary nitrogen derived from the intercept of significant regressions of nitrogen intake against urine and faecal nitrogen outputs were 5·07 g/kg dry matter eaten and 3·46 g/day (0·35 kg W0·75) respectively. The diets had a mean biological value of 73·6%. The digestible crude protein requirements for maintenance were (g/day) 29·0, 38·4 and 26·6 when estimated from nitrogen retention, factorially and from live-weight performance respectively.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 92 , Issue 1 , February 1979 , pp. 113 - 122
Copyright
Copyright © Cambridge University Press 1979

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