Abstract
THE results of three experimental studies indicate that an excess of vitamin D decreases the hatchability of chicken eggs. Branion and Smith (1932) found that an excess of vitamin D from viosterol (a solution of irradiated ergosterol in oil) lowered hatchability, and Titus and Nestler (1935) confirmed those results and also found that an excess of vitamin D from cod-liver oil had the same effect.Heywang (in press) reported that hatchability was adversely affected when pullets received 2,700 A.O.A.C. chick units of vitamin D per pound of diet from D-activated animal sterol in addition to receiving enough vitamin D from direct sunlight for good hatchability. It was not appreciably affected, however, when pullets received only 540 A.O.A.C. chick units of vitamin D per pound of diet from D-activated animal sterol in addition to receiving ample vitamin D from direct sunlight.Cod-liver oil is a common source of the 540 units .
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