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Experiments were conducted: as pilot experiments in which each experimental unit, replicated two or three times, consisted of 15 hens, as practical experiments in which each of four strains was replicated twice in two rooms containing 200 to 265 hens, and as commercial experiments in which each experimental unit consisted of 4 strains of 1000 hens but in(More)
A total of 1500 pullets and 300 cockerels were obtained at one-day of age and reared to six weeks on a commercial-type diet. At six weeks of age, birds were fed one of the following: Diets 1, 2 and 3 contained 0.150 percent tryptophan and no added niacin, 28 mg. added niacin and 250 mg. added niacin per kg. of diet, respectively. Diets 4, 5 and 6 contained(More)
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