Studies on the Vitamin a Requirements of the Rat

The relationship between the weight of young vitamin A-deficient rats and the increase in weight after β-carotene administration

“…Different workers hold different opinions on the correlation between a rat's body weight and its need for vitamin A. Greaves & Schmidt (1936) claim to have shown, on the basis of changes in the vaginal cozitents, that within the limits of age and body weights of the rats used by them, the vitamin A requirements are independent of these factors. They used cod-liver oil as their source of vitamin A.…”