Vitamin K Storage and Prothrombin Levels in Chicks Obtained from Injected Eggs. ∗

Summary

Vitamin K (potassium 2-methyl-1,4-naphthohydroquinone disulfate), injected into eggs prior to their incubation, produces vitamin K stores in newly-hatched chicks. The injected vitamin protects against the rapid and extreme fall of the pro-thrombin level which occurs when chicks are placed on a vitamin K-free diet.