R. R. Wheeler, Weswig, P. H., Brannon, W. F., Hubbert, F., and Sawyer, W. A.,
“The Carotene and Vitamin A Content of Plasma and Liver of Range Hereford Cows and Their Calves in the Northern Great Basin”,
Journal of Animal Science, vol. 16, no. 2, pp. 525 - 536, 1957.
OREGON STATE UNIVERSITY
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