Some Factors Which Affect Utilization of Vitamin A

The Vitamin a Requirement of the Young Pig

“…Other workers have found that the presence of added soybean lecithin in the diet of the dam before parturition has no influence on the vitamin A stores of the lamb or pig, at birth and 30 days of age (53) • However, Kramke et al (125) found that when 0.75% alfalfa meal was used as a source of carotene for chicks and poults, the carotene utilization and growth were improved by inclusion of crude soybean lec ithin, defatted lecithin or crude soybean oil. occurs in the liver of the rat.…”

Evaluation of Vitamin Requirement Data

“…A more recent report on the comparative potencies of vitamin A active substances for promoting growth of turkeys has shown that carotene, alfalfa meal and various forms of vitamin A are equivalent on the usual unit basis in the presence of one percent wheat germ oil in the diet (Kramke et al, 1952). The above equations, of course, merely show how the observations may be coordinated on the basis of a few simple assumptions.…”

Evidence for a Substance in Fish Solubles Which Enhances Vitamin A Storage in Chick Livers

“…Repeated injections of dibenzanthracene were found to decrease vitamin A storage by Goerner and Goerner (1939). Kemmerer et al (1947) and Ronning and Knodt (1950) found sulfasuxidine and sulfaquinoxaline to have no detectable effect on liver storage of vitamin A. Alpha tocopherol has been found to enhance the utilization of vitamin A (Adamstone, 1947;Kemmerer et al, 1947;Kramke et al, 1950) and in excessive quantities to be antagonistic (Hickman, 1943). Xanthophyll has been found to enhance the utilization of vitamin A (Sherman, 1947).…”

“…Xanthophyll has been found to enhance the utilization of vitamin A (Sherman, 1947). A factor present in lecithin and soybean oil has been reported to be essential for the metabolism of vitamin A (Slanetz and Scharf, 1943;Scharf and Slanetz, 1944;Kramke et al, 1950).…”