The Vitamin A Requirements of Breeding Turkeys and Their Progeny

Vitamin A Requirement of Breeding Turkeys

“…This agrees with the minimal requirement reported by Stoewsand and Scott (1961). units per 453.6 grams for maximal egg production and hatchability of fertile eggs.…”

Effect of Vitamin A and Protein Levels on Growth and Semen Quality of Turkeys

“…The importance of vitamin A, in the diet of turkey breeder hens, for maximum egg production and hatchability of fertile eggs was reported by Stoewsand and Scott (1961) and Jensen (1965). The vitamin A level in turkey breeder diets, as recommended by the National Research Council (N.R.C.)…”

Effect of dietary vitamin A, ascorbic acid and their interaction on turkey bone mineralization

“…Data of Stoewsand and Scott (1961) indicate 2650 lU is adequate to maintain egg production and hatchability when vitamin A palmitate is used as the vitamin A source. However, higher dietary levels were needed to maintain high levels of vitamin A in the egg and for carry-over to poults.…”

“…hut growth was restricted in poults given marginal levels of the vitamin. Stoewsand and Scott (1961) reported Ataxia produced in vitamin A-deficient animals results from abnormal bone growth that damages the central nervous system (Mellanby, 1950;Wolbach, 1954;Barnicot and Datta, 1956;Howell and Thompson, 1967a and b). Mellanby (1950) suggested that excessive apposition of periosteal bone in vitamin A deficiency restricted the area available for the growing central nervous system, thus resulting in nerve damage.…”