Abstract
Using actively laying white Leghorn hens feeding experiments were conducted giving simplified diets of white corn-soya or yellow corn-soya to know the amount causative of B-complex vitamin deficiency and proper quantity of the vitamin supplementation for their egg production, mortality, hatchability, feed intake, feedconversion and body weight. Varying levels of vitamin supplementations (table 2, 4) were used in this experiment.
The results were as follows.
white corn-soya diets without B-complex vitamin supplementation decreased egg production, hatchability, feed intake, and increased mortality and feed conversion.
The addition of riboflavin (0.08mg/100g) resulted in a significantry increase in egg production and feed intake, but hatchability was clearly lower than practical laying ration feeding. Yellow corn-soya diets without riboflavin supplementation clearly decreased egg production and hatchability.
The riboflavin requirements for practical laying ration was 0.25mg/100g and that for breeding ration was 0.38mg/100g.
