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Inorganic Phosphorus Content and Phosphatase Activity of the Blood Serum of Goals

United States Department of Agriculture¹

Abstract

Determinations of inorganic phosphorus content and of alkaline phosphatase activity have been made on blood serum obtained from 12 foals at various times between the hour of birth and six months of age. The results of these analyses for inorganic phosphorus have yielded a mean value of 4.30±0.32 mg. percent of inorganic phosphorus at birth. This level increased rapidly during the first 48 hours, then more gradually to a maximum of 8.75±0.31 mg. percent between two and three months, after which it tended to decline.

A mean alkaline phosphatase activity equivalent to 109±9.2 Bodansky units per 100 ml. of serum was observed at birth, the level declining rapidly for the first 48 hours to a mean value of 73.5±6.0 units and then progressively more slowly to a mean level of 17.3±0.9 units at six months of age.

The observations indicated that the changes in both inorganic phosphorus and phosphatase activity immediately following birth are, in large part at least, unrelated to food intake.

¹ Bureau of Animal Industry.