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Replacement and Absorption of Cerebrospinal Fluid in Normal and Vitamin A Deficient Calves

Dairy Cattle Research Branch, U. S. Department of Agriculture, Beltsville, Maryland

ABSTRACT

Cerebrospinal fluid (CSF) replacement and absorption were measured in vitamin A deficient and normal calves. Replacement estimates involved removal of CSF and determination of the time necessary to replace the volume removed, and absorption estimates involved reinjection of the fluid and estimation of the time necessary to absorb this volume. Thirty-five minutes were required to replace the 3.0 ml of CSF in the normal animals, as compared to 15 min in the deficient calves. When estimating absorption capacity in the deficient calves, the CSF pressure was highly stable in 11 of the 12 experiments and the trials were terminated between 25–60 min. With normal calves the pressures returned to the original level in 17 min. The results suggest that underabsorption represents a greater factor than overproduction as a cause of increased CSF pressure in vitamin A deficient calves.

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