Über den Vitamin-B12-Gehalt von Organen verschieden ernährter Ratten

Adult, male rats bred for over 10 generations on a soy meal-corn-diet had vitamin B12 values of liver and kidney about 10 times lower than the controls. If the deficient ration was supplemented with 5µg/kg of B12, these values were still about 1/5 of the controls. 3 weeks on the deficient diet lowered the B12 levels in the livers and kidneys of previously undepleted rats to about 1/2, and a similar diet containing 0.1% of iodized casein lowered these levels to about 1/3 of the normal values but did not lower the B12-concentration of organs of already deficient rats.