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The inorganic constituents of milk IV. Diffusible calcium and magnesium concentrations in goat's milk and the effect of starvation

Published online by Cambridge University Press:  01 June 2009

Ian H. L. Ormrod ,
Carl Holt  and
Phillip C. Thomas
Ian H. L. Ormrod
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, Scotland
Carl Holt
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, Scotland
Phillip C. Thomas
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, Scotland
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Summary

The concentrations of diffusible Ca and Mg in milk diffusates from 3 goats were determined before, during and after a 2-d period of starvation. Free Ca-concentrations were determined by a murexide method and compared with values calculated from a detailed model of the ion equilibria. It was shown that diffusible Ca increased as citrate increased during fasting and both decreased after refeeding, but there was a difference of about half a day in the response curves, with citrate following Ca. The difference was accounted for mainly by a change in free Ca2+ concentration which in turn was related mainly to changes in milk pH. Diffusible Mg underwent changes similar to those of diffusible Ca.

Type
Original Articles
Information
Journal of Dairy Research , Volume 49 , Issue 2 , May 1982 , pp. 179 - 186
Copyright
Copyright © Proprietors of Journal of Dairy Research 1982

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References

REFERENCES

Faulkner, A. 1980 The presence of cellular metabolites in milk. Biochimica et Biophysica Acta 630 141–145CrossRefGoogle ScholarPubMed
Holt, C. 1982 The inorganic constituents of milk. III. The colloidal calcium phosphate of cows's milk. Journal of Dairy Research 49 29–38CrossRefGoogle ScholarPubMed
Holt, C., Dalgleish, D. G. & Jenness, R. 1981 Calculation of the ion equilibria in cow's milk ultrafiltrate and comparison with experiment. Analytical Biochemistry 113 154–163CrossRefGoogle Scholar
Holt, C. & Muir, D. D. 1978 Natural variations in the average size of bovine casein micelles. II. Milk samples from creamery bulk silos in south west Scotland. Journal of Dairy Research 45 347–353CrossRefGoogle Scholar
Holt, C. & Muir, D. D., 1979 Inorganic constituents of milk. I. Correlation of soluble calcium with citrate in bovine milk. Journal of Dairy Research 46 433–439CrossRefGoogle Scholar
Holt, C., Muir, D. D., Ormrod, I. H. L., Zammit, V. A. & Peaker, M. 1979 Citrate in milk. Hannah Research Institute Annual Report 63–69Google Scholar
Konar, A., Thomas, P. C. & Rook, J. A. F. 1971 The concentrations of some water-soluble constituents in the milks of cows, sows, ewes and goats. Journal of Dairy Research 38 333–341CrossRefGoogle Scholar
Linzell, J. L. 1967 The effect of very frequent milking and of oxytocin on the yield and composition of milk in fed and fasted goats. Journal of Physiology 190 333–346CrossRefGoogle ScholarPubMed
Linzell, J. L. 1974 Mammary blood flow and methods of identifying and measuring precursors of milk. In Lactation vol. 1 pp. 143–225 (Eds Larsen, B. L. and Smith, V. R.) New York: Academic PressGoogle Scholar
Ormrod, I. H. L., Thomas, P. C. & Wheelock, J. V. 1979 The effect of diet on the citric acid and soluble calcium content of cow's milk. Proceedings of the Nutrition Society 38 121 AGoogle ScholarPubMed
Ormrod, I. H. L., Thomas, P. C. & Wheelock, J. V. 1980 The effect of dietary inclusions of tallow on the citric acid and soluble calcium content of cow's milk. Proceedings of the Nutrition Society 39 33 AGoogle ScholarPubMed
Peaker, M. & Linzell, J. L. 1975 Citrate in milk: a harbinger of lactogenesis. Nature 253 464CrossRefGoogle ScholarPubMed
Rook, J. A. F. & Hopwood, J. B. 1970 The effects of intravenous infusions of insulin and of sodium succinate on milk secretion in the goat. Journal of Dairy Research 37 193–198CrossRefGoogle Scholar
White, J. C. D. & Davies, D. T. 1963 The determination of citric acid in milk and milk sera. Journal of Dairy Research 30 171–189CrossRefGoogle Scholar