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Cerebrospinal Fluid Composition Studies in Calves on Varying Carotene Intakes¹

Storrs (Connecticut) Agricultural Experiment Station

ABSTRACT

An increase in cerebrospinal fluid (CSF) pressure appears to be the first measurable change in vitamin A deficiency in the calf (8, 10). On this basis, it appeared plausible that concentration changes of certain constituents in CSF might occur prior to this increased pressure.

Twelve Guernsey and 12 Holstein 64-day old male calves were placed on a vitamin A depletion ration until their blood plasma vitamin A level had decreased to 12 %. Thereafter, with restrictions as to breed, each animal received one of four carotene intakes, 30, 60, 120, or 240 /lb live weight/day, from artificially dehydrated alfalfa. A more complete description of the depletion ration and the experimental procedure used in this study has been reported by Eaton et al. (5). The 30- intake level was chosen on the basis that it should result in an increased CSF pressure in the Guernsey calves, but be just adequate to prevent this in the Holsteins (9).

¹ The author is indebted to H. D. Eaton for helpful suggestions in the preparation of this manuscript.

² Present address: Department of Animal Science, Ohio Agricultural Experiment Station, Wooster, Ohio.