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Defluorinated rock phosphate as a source of phosphorus for growing sheep

Published online by Cambridge University Press:  27 March 2009

R. G. Hemingway  and
G. Fishwick
R. G. Hemingway
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow
G. Fishwick
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow
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Extract

Defluorination of rock phosphate by heat treatment is an important method of producing phosphates suitable for animal feed. A variety of such products have been evaluated as phosphorus sources for ruminants, e.g. Beeson et al. (1945) recorded that a material produced at a low temperature (600°C) was unsatisfactory for steers, but Ammerman et al. (1957) indicated that a calcined calcium phosphate acidified with either sulphuric or phosphoric acids was fully as satisfactory as dicalcium phosphate for steers, but not for growing sheep. Wise, Wentworth & Smith (1961) and O'Donovan et al. (1965) recorded that defluorinated rock phosphates (produced by unspecified methods) were as useful as dicalcium phosphate for growing cattle. Arrington et al. (1963) have reported that 32P contained in reagent grade dicalcium phosphate was better retained by growing cattle than when present as a defluorinated rock phosphate.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 84 , Issue 2 , April 1975 , pp. 381 - 382
Copyright
Copyright © Cambridge University Press 1975

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References

REFERENCES

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