Abstract
THE effect of various thyroproteins on laying hens has been studied fairly extensively since 1923 when Crew and Huxley first attempted to demonstrate that thyroid feeding had an effect on egg production. Turner et al. (1945a, b) found that protamone, an iodinated casein with high thyroidal activity, increased egg production when added to the diet. These workers concluded that an optimum level of protamone in the feed ranged between five and ten grams per hundred pounds of feed. Additional work by Turner et al. (1946) demonstrated that protamone fed continuously at ten grams per 100 pounds of feed prevented a decrease in egg production during the summer months. Work by Singh and Shaffner (1950) indicated that thyroprotein elevated the basal metabolic rate. However, Lillie et al. (1952) questioned whether it improved egg production although the hen’s basal metabolism was increased.The use of estrogens to prevent further degeneration and relieve…
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