Studies on the Pyridoxin Requirements of Laying and Breeding Hens

Studies on Nutrition Op Poultry

“…The requirements of riboflavin (Lepkovsky et al 1938), biotin (Cravens, Sebesta, Halpin and Hart, 1942), pantothenic acid (Gillis, Heuser and Norris, 1942), folic acid (Taylor, 1946) and vitamin E (Barnum, 1935), are greater for hatchability than for egg production. I n regard to pyridoxin (Cravens, Sebesta, Halpin and Hart, 1946), and vitamin D (Titus, 1939) a quantity sufficient for maximum egg production k also sufficient for maximum hatchability.…”

Relation of Tryptophan and Lysine to Egg Production, Hatchability and Composition of the Protein of Hens’ Eggs

“…Extensive studies have established, within rather narrow limits, the requirements of the rat (Rose, 1937, and Frazier el al., 1.949), the chick (Almquist, 1947) and the human (Rose, 1949) for the essential amino acids. Cravens and Halpin (1946) and Cravens (1948) We are indebted to E. I. duPont deNemours Company, Wilmington, Delaware, for the lysine and methionine and to the Dow Chemical Company, Midland, Michigan, for the glycine and tryptophan. Cravens and Halpin (1946) and Cravens (1948) We are indebted to E. I. duPont deNemours Company, Wilmington, Delaware, for the lysine and methionine and to the Dow Chemical Company, Midland, Michigan, for the glycine and tryptophan.…”

Influence of vitamin B6 deficiency on selected aspects of metabolism in the chick

“…Although four different levels of vitamin B$ were tested, the work was very limited to definitely establish a requirement. In a later paper, the same workers (Cravens et al., 1946) meg of vitamin B5 pet "gram. Monson and Krengel (1961) reported the results of an experiment in which 1.5 mg of pyridoxine hydrochloride per pound of ration were added to an all vegetable breeder diet containing 1.91 mg pyridoxine hydrochloride per pound.…”

“…In a study on the vitamin B^ requirement of laying and breeding hens, Cravens <et al (1946) pointed out by these authors. Differences in rate of gain were evident 3 to 4 days after day-old ducklings were given the de ficient ration.…”