Abstract
TWO groups of workers have shown that an excess of vitamin D from some sources adversely affects the hatchability of chicken eggs. Branion and Smith (1932) found that an excess of vitamin D from a solution of irradiated ergosterol in oil (viosterol) decreased hatchability, and Titus and Nestler (1935) confirmed those results and also showed that an excess of vitamin D from cod liver oil had the same effect.D-activated animal sterol (7-dehydrocholesterol) is one of the common sources of vitamin D in diets for chickens, and Bethke and co-workers (1937) found it equal to cod liver oil as a source of vitamin D for hatchability. However, there are no published experimental data which indicate whether the hatchability of their eggs is lowered when chickens receive a relatively large quantity of vitamin D from D-activated animal sterol. There also are no data showing the effect on the hatchability of their .
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