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Animal and dietary variation in the absorption and metabolism of phosphorus by sheep

Published online by Cambridge University Press:  27 March 2009

A. C. Field ,
J. A. Woolliams ,
R. A. Dingwall  and
C. S. Munro
A. C. Field
Affiliation:
Moredun Research Institute, Edinburgh, EH17 7JH
J. A. Woolliams
Affiliation:
Animal Breeding Research Organisation, Edinburgh, EH9 3JQ
R. A. Dingwall
Affiliation:
Moredun Research Institute, Edinburgh, EH17 7JH
C. S. Munro
Affiliation:
Moredun Research Institute, Edinburgh, EH17 7JH
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Summary

In Expt 1 the efficiency of absorption of phosphorus in feedingstuffs was compared within four sets of 18-month-old, chimaera-derived triplets; 12 feedingstuffs were evaluated in four balance trials with 32P. Seven diets consisted of a P-rich ingredient mixed with a low-P basic diet and five of hay or pelleted dried grass or lucerne. The P ingredients tested were the protein-rich meals, rape, soya-bean, maize gluten, fishmeal and rice bran, and the cereals, barley and wheat.

Sets of triplets absorbed dietary P with different (P < 0·001) efficiencies; the mean values were 0·72, 0·63, 0·76 and 0·79. The availability of P differed (P < 0·001) between diets, highest values being seen with the fishmeal (0·80), barley (0·78) and wheat diets (0·78) and the lowest with rice bran (0·63) and a perennial ryegrass hay (0·64). There was no evidence for an age effect on efficiency of absorption.

Endogenous faecal excretion was positively related to intake (P < 0·001) and negatively related to efficiency of absorption of dietary P. Plasma concentration was positively related (P < 0·001) to both intake and, between sets, to the efficiency of absorption.

Significant urinary excretion of P generally occurred when the efficiency of absorption was greater than 0·70. Two members of a set which absorbed P with high efficiency and excreted low volumes of urine died from urethral obstruction caused by calculi.

In Expt 2 an estimate of the variation in the concentration of P in plasma of 48 ewes on a barley-based diet was assessed and the values for three of the chimaera sets fell within the top quartile.

Safety factors were calculated from the animal and plant variations in the efficiency of absorption of dietary P and used to determine dietary allowances for different classes of sheep.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 103 , Issue 2 , October 1984 , pp. 283 - 291
Copyright
Copyright © Cambridge University Press 1984

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References

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