Effect of Lactobacillus casei Eluate Fraction on Reproduction in the Domestic Fowl

The Effect of Folic Acid on Egg Production and Hatchability

“…The above results are in close harmony with the findings of Cravens, Sebesta, Halpin and Hart (1942) who extablished that the Lactobacillus casei e factor of a solubilized liver extract was essential for normal development of the chicken embryo. A deficiency of this factor was found to give a less pronounced decline in egg production than in hatchability; some birds continued to lay while others lost weight and ceased production.…”

Supplements for Distillers’ By-Products in Poultry Breeding Diets

“…A deficiency of the factor or factors involved resulted in a less pronounced decline in egg production than in hatchability. Cravens et al (1943) showed conclusively, that .vitamin B 8 is essential for normal egg production, hatchability and maintenance of body weight.…”

“…Snell and Quarles (1941) reported results indicating that nicotinic acid and inositol are synthesized by the chick embryo and presumably by the chick and the total amounts of riboflavin, pantothenic acid and biotin in hen eggs do not change during incubation. Cravens et al (1942a) showed that biotin is essential for normal embryonic development in the hen's egg and that a deficiency of it had little effect on egg production. Cravens et al (1942b) presented evidence that the Lactobacillus casei e eluate fraction is essential for normal development of the chicken embryo.…”

“…Cravens et al (1942a) showed that biotin is essential for normal embryonic development in the hen's egg and that a deficiency of it had little effect on egg production. Cravens et al (1942b) presented evidence that the Lactobacillus casei e eluate fraction is essential for normal development of the chicken embryo. A deficiency of the factor or factors involved resulted in a less pronounced decline in egg production than in hatchability.…”