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Endogenous faecal loss of phosphorus in growing lambs and the calculation of phosphorus requirements

Published online by Cambridge University Press:  27 March 2009

G. D. Braithwaite
G. D. Braithwaite
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, Berkshire, RG2 9AT
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Summary

The endogenous faecal loss of P has been investigated in growing lambs given diets either grossly deficient, moderately deficient or just adequate in P. This loss was found to increase in direct relation to the increased P intake, in spite of the high P requirements of the deficient animals, which suggests that some increased loss with increased P intake is inevitable. Results throw doubt on the validity of the assumption made by the Agricultural Research Council (1980) in their calculations of P requirements, that the endogenous faecal loss of P is maintained at a constant level equal to that which occurs at zero P intake, until requirements are met.

Even on the diet which was, according to Agricultural Research Council (1980) recommendations, just adequate in P, lambs were unable to retain the expected amount of P commensurate with their growth. This inability to retain P was not due to a failure of P absorption, since the efficiency of absorption from this diet was higher than the value used by the Agricultural Research Council (1980) in their calculations. Rather, it must have been due to an inevitable endogenous faecal loss of P that was considerably higher than the value assumed by the Agricultural Research Council (1980).

It is suggested that in future the value of endogenous faecal loss used in calculations of P requirements is the minimum one that allows a particular requirement to be achieved.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 105 , Issue 1 , August 1985 , pp. 67 - 72
Copyright
Copyright © Cambridge University Press 1985

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References

REFERENCES

Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock, No. 2, Ruminants. London: H.M.S.O.Google Scholar
Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock. Slough: Commonwealth Agricultural Bureaux.Google Scholar
Aubert, J.-P. & Milhaud, G. (1960). Methode de mesure des principales voies du métabolisme calcique chez l'homme. Biochimica et Biophysica Acta 39, 122–139.CrossRefGoogle Scholar
Boxebeld, A., Gueguen, L., Hannequart, G. & Durand, M. (1983). Utilization of phosphorus and calcium and minimal maintenance requirement for phosphorus in growing sheep fed a low-phosphorus diet. Reproduction, Nutrition, Développement 23, 1043–1053.CrossRefGoogle Scholar
Braithwaite, G. D. (1981). Effect of 1α-hydroxycholecalciferol on calcium and phosphorus metabolism in sheep given high or low calcium diets. Journal of Agricultural Science, Cambridge 96, 291–299.CrossRefGoogle Scholar
Braithwaite, G. D. (1983 a). Calcium and phosphorus requirements of the ewe during pregnancy and lactation. 1. Calcium. British Journal of Nutrition 50, 711–722.CrossRefGoogle Scholar
Braithwaite, G. D. (1983 b). Calcium and phosphorus requirements of the ewe during pregnancy and lactation. 2. Phosphorus. British Journal of Nutrition 50, 723–736.CrossRefGoogle ScholarPubMed
Braithwaite, G. D. (1984). Some observations on phosphorus homoeostasis and requirements of sheep. Journal of Agricultural Science, Cambridge 102, 295–306.CrossRefGoogle Scholar
Braithwaite, G. D., Glascock, R. F. & Riazuddin, Sh. (1969). Calcium metabolism in lactating ewes. British Journal of Nutrition 23, 827–834.CrossRefGoogle ScholarPubMed
Field, A. C. (1983). Maintenance requirements of phosphorus and absorbability of dietary phosphorus in sheep. Journal of Agricultural Science, Cambridge 100, 231–233.CrossRefGoogle Scholar
Field, A. C., Coop, R. L., Dingwall, R. A. & Munro, C. S. (1982). The phosphorus requirements for growth and maintenance of sheep. Journal of Agricultural Science, Cambridge 99, 311–317.CrossRefGoogle Scholar
Grace, N. D. (1980). Effect of increasing phosphorus intake on the P faecal endogenous loss in the sheep. Proceedings of the New Zealand Society for Animal Production 40, 211–225.Google Scholar
Institut National de la Recherche Agronomique (1978). Alimentation des Ruminants. Versailles: INRA Publications.Google Scholar
National Research Council (1968). Nutrient Requirements of Domestic Animals, No. 5, Nutrient Requirements of Sheep. Publication 1693. Washington, D.C.: National Academy of Sciences.Google Scholar
National Research Council (1975). Nutrient Requirements of Sheep, 5th ed.Washington, D.C: National Academy of Sciences.Google Scholar
Preston, R. L. & Pfander, W. H. (1964). Phosphorus metabolism in lambs fed varying phosphorus intakes. Journal of Nutrition 83, 369–378.CrossRefGoogle ScholarPubMed
Suttle, N. F. & Field, A. C. (1968). Effects of intakes of copper, molybdenum and sulphate in copper metabolism in the sheep. 1. Clinical conditions and distribution of copper in blood of the pregnant ewe. Journal of Comparative Pathology 78, 351–362.CrossRefGoogle Scholar
Young, V. R., Lofgreen, G. P. & Luick, J. (1966). The effects of phosphorus depletion and of calcium and phosphorus intake, on the endogenous excretion of these elements by sheep. British Journal of Nutrition 20, 795–805.CrossRefGoogle ScholarPubMed