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Comparative retentions of fluorine and phosphorus by growing sheep given either defluorinated rock phosphate or dicalcium phosphate of different particle sizes

Published online by Cambridge University Press:  27 March 2009

R. G. Hemingway  and
Allison M. Finn
R. G. Hemingway
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow
Allison M. Finn
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow
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Summary

A low phosphorus diet given to growing sheep in metabolism cages was supplemented with different sized fractions of either defluorinated phosphate or dicalcium phosphate. For material of particle size between 0·50 and 0·25 mm diameter, significantly less fluorine was present in the urine and more in the faeces of sheep given defluorinated phosphate than for those given dicalcium phosphate. The fluorine present in coarser defluorinated phosphate was of similar availability to that smaller than 0·50 mm. Finer grade defluorinated or dicalcium phosphates smaller than 0·25 mm diameter were not more biologically available in respect of either fluorine or phosphorus than those of particle size 0·50 to 0·25 mm. The availability of the phosphorus in defluorinated phosphate was reduced when material coarser than 0·50 mm was given to the sheep.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 89 , Issue 3 , December 1977 , pp. 683 - 685
Copyright
Copyright © Cambridge University Press 1977

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