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Journal of Dairy Science Vol. 41 No. 10 1456-1459
© 1958 by American Dairy Science Association ®
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Association between Plasma and Liver Concentrations of Vitamin A or of Tocopherol in Holstein Male Calves Fed Fixed Intakes of these Vitamins1

H. D. Eaton, J. E. Rousseau, Jr.2, Martha W. Dicks, R. Teichman3 and A. P. Grifo, Jr.

Storrs (Conn.) Agricultural Experiment Station

ABSTRACT

It is generally recognized that plasma vitamin A and plasma tocopherol concentrations increase in a diminishing manner with increases in intake of either of these vitamins, and that liver vitamin A and liver tocopherol concentrations increase in an essentially constant manner with increases in intake. This was especially apparent for those data in which animals were partially depleted of their body stores of these nutrients prior to supplementation with the vitamin(s), or in instances in which the supplementation periods were of sufficient duration to allow stabilization of the responses of both plasma and liver concentrations. From these relationships Almquist (1,2), in studying data from poultry, rats, lambs, and cattle, proposed that plasma vitamin A concentration was linearly related to the logarithm of liver vitamin A concentration. Although an initial study with calves (8), over only a limited range of relatively low concentrations of plasma and liver vitamin A, indicated a linear regression between these two variables, a subsequent study (10) over considerably wider concentrations confirmed Almquist's finding of a linear regression between plasma and log liver vitamin A concentrations.

FOOTNOTES

1 This study was supported in part by funds from the Chas. M. Cox Co. and the Chas. H. Hood Dairy Foundation, Boston, Mass. and the Am. Dehydrators Assoc., Kansas City, Mo. Some of the data were from experiments supported with funds provided by the Research and Marketing Act of 1946, through contracts between the Storrs (Conn.) Agricultural Experiment Station and Dairy Cattle Research Branch of the U. S. Dept. of Agriculture. The authors are grateful to various staff members for helpful suggestions and, in particular, to D. G. Gosslee, Station Biometrician, for aid in revision of the manuscript. We are also indebted to Mrs. Mae Miller and Elaine Trantum for technical assistance in computations and preparation of the paper.

2 Present address: U. S. Fishery Products Lab., Ketehikan, Alaska.

3 Present address: Animal Industry and Experimental Statistics Dept., North Carolina State College, Raleigh.






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Copyright © 1958 by the American Dairy Science Association ®.