R. M. Bethke

TL;DR: It is pointed out that the relative proportions of these three factors, particularly the quantitative relations, between the calcium and phosphorus in the food supply are of great significance in determining whether an animal, like the rat, will develop bones which are normal or pathological.

TL;DR: Evidence has been accumulating during the past 30 years to establish the fact that essential dietary factors are synthesized in the digestive tract of ruminants, and fundamental principles with reference to the synthesis of vitamins and vitamin-like factors within the digestive tracts or after the contents are voided been applied to chickens.

TL;DR: A paralytic leg disorder which affects chicks, and that appears to be different in cause and effect from rickets, hock joint disease (slipped tendon) or “crazy chicks” has recently been reported by Norris, Heuser and Wilgus.

TL;DR: It is found that 0.03 mg.