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Journal of Dairy Science Vol. 25 No. 6 537-578
© 1942 by American Dairy Science Association ®
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Studies on the Chemical Composition of the Blood of Dairy Cattle. III. The Normal Concentration of Inorganic Phosphorus in the Whole Blood of Dairy Cattle and Factors Affecting it1

A. H. Vanlandingham2, H. O. Henderson3 and G. A. Bowling3

West Virginia Agricultural Experiment Station, Morgantown

ABSTRACT

The level of inorganic phosphorus in the blood of dairy cattle is especially sensitive to low levels of phosphorus intake (11, 16, 21, 22) to deficiencies of Vitamin D in the ration, or to exposure of animals to sunshine or ultra violet light (2,10,18). If it may be assumed that a ration just capable of supporting a normal (maximal) concentration of inorganic phosphorus in the blood is adequate in phosphorus for all prevailing functions, providing of course, the ration is well balanced in all other respects, the blood inorganic phosphorus level may be readily applied in the determination of the minimum phosphorus requirements of cattle. In order to determine the minimum phosphorus requirements of cattle by this means it is necessary to know the normal level of blood composition of animals at various ages (15, 21) and the effect of such factors as pregnancy, lactation and various environmental conditions.

Normal values for the inorganic phosphorus content of blood serum or plasma have been reported by Palmer, Cunningham and Eckles (15), Anderson, Galey and Pratt (1), Haag and Jones (7) and Eveleth, Eveleth and Walsh (4).

FOOTNOTES

1 Published with the approval of the Director of the West Virginia Agricultural Experiment Station as Scientific Paper No. 281.

2 Departments of Agricultural Chemistry and Dairy Husbandry, respectively.

3 Departments of Agricultural Chemistry and Dairy Husbandry, respectively.






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