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Dried poultry manure as a source of phosphorus for sheep

Published online by Cambridge University Press:  27 March 2009

A. C. Field ,
C. S. Munro  and
N. F. Suttle
A. C. Field
Affiliation:
Moredun Research Institute, Edinburgh EH.17 7JH
C. S. Munro
Affiliation:
Moredun Research Institute, Edinburgh EH.17 7JH
N. F. Suttle
Affiliation:
Moredun Research Institute, Edinburgh EH.17 7JH
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Summary

Feeding and balance trials with 32P were carried out to measure the true absorption of P in battery and broiler waste and to assess the risk of urolithiasis in sheep.

Groups of six, 8-week-old Scottish Blackface lambs were given one of eight experimental diets containing barley and either 15, 30, 45 or 60% of dried broiler or battery waste. After about 12 weeks on the diet, balance trials with 32P were conducted on a sample of the female lambs from each dietary group. The phosphorus intakes ranged from 4·6 to 15·9g/day.

Poultry waste was a good source of P. The proportion of dietary P absorbed by the lambs (A) ranged from 0·49 to 0·90 and was inversely related to the dietary intake of P (I). The relationship was A = 0·893 – 0·0219I. All lambs were in positive P balance (0·24–2·81 g/day), but only the bones from the lambs consuming the diets containing 45 and 60% broiler waste were not osteoporotic.

All lambs absorbed more P than they retained and the partition of the excess between urine and faeces were very variable.

No clinical cases of urolithiasis were seen, but uroliths were found at post-mortem. The incidence was highest in lambs consuming broiler waste and in lambs consuming the diets containing 15% poultry waste.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 89 , Issue 3 , December 1977 , pp. 599 - 604
Copyright
Copyright © Cambridge University Press 1977

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