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Journal of Dairy Science Vol. 51 No. 11 1781-1786
© 1968 by American Dairy Science Association ®
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Osmotic Flow During Ventriculocisternal Perfusion of Vitamin A-Deficient Calves1

M. C. Calhoun2, H. D. Hurt3, H. D. Eaton, J. E. Rousseau, Jr. and R. C. Hall, Jr.

Animal Nutrition, Animal Industries Department, George C. White Hall Storrs (Conn.) Agricultural Experiment Station

ABSTRACT

Rate of formation (Vf) of cerebrospinal fluid (CSF) during ventriculocisternal perfusion with either a hypo- or hyperosmotic synthetic CSF was determined for nine vitamin A-deficient calves and eight controls. The average intraventricular CSF pressures were 272 and 38 mm of synthetic CSF for the deficient and control calves, respectively, with corresponding plasma vitamin A concentrations of 6 and 36 µg/100 ml. Inappreciable differences in the response of Vf to the hypo- or hyperosmotic perfusion fluid during VCP for the vitamin A-deficient and control calves were observed. This was consistent with the previously reported lack of difference in permeability of the ventricular ependyma to creatinine between vitamin A-deficient and control calves. Thus, it appears that only those sites responsible for bulk absorption of CSF are impaired in the vitamin A-deficient calf.

FOOTNOTES

1 Scientific contribution no. 320, Agricultural Experiment Station, University of Connecticut, Storrs. This investigation was supported in part by grant-in-aid funds provided by a Public Health Service Research Grant, NB-02108, from The National Institute of Neurological Diseases and Blindness and by Hoffmann-La Roche, Nutley, N.J.

2 Present address: Animal Science and Agricultural Biochemistry Department, University of Delaware, Newark, Del. 19711.

3 Present address: Animal Science Department, Morrison Hall, Cornell University, Ithaca, New York 14850.






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Copyright © 1968 by the American Dairy Science Association ®.