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None Bi B 2 Be Biotin Pantothenic acid AH Vitamins 26.7 60.0 53.3 66.7 33.3 0.0 0.0 25 chicks per treatment group.the hatcheryman treated all his newly hatched birds with a vitamin solution Considerable interest has been shown recently in the use of dominant white sires in the production of white-plumaged broiler chickens. As far as the authors are aware no experiments have been conducted to determine the influence of dominant white on growth and feed efficiency. It was considered of interest and value, therefore, to make such an experiment.The chicks used in the experiment were obtained as progenies of five individual sire matings. In four of the matings the sires used were obtained from a cross of dominant white White Rocks crossed with a meat strain of Barred Rocks. Thus, four of the males used as sires for the stock of this experiment were of the genotype li (heterozygous for dominant white). They were backcrossed to the meat strain Barred Rock females (ii). In the fifth mating the females were from the same mat-and the results were excellent. At the same time the breeder who had been using a diet which theoretically should have supplied enough pantothenic acid was advised to add this vitamin and after several weeks the condition was cleared up.In each of the several cases of a similar nature reported to this laboratory there was some indication that the same condition was involved, and in each case the breeding diet appeared to be satisfactory. A possible explanation is that the inclusion of fat into poultry rations increases the pantothenic acid requirement, since it is a major component of coenzyme A, which in turn has been shown to be most important in fat metabolism.ings as the sires mentioned above and were also of the genotype Ii. They were backcrossed to a meat strain Barred Rock male (ii).Thus the separate progenies of each male were paternal half-sibs and approximated a 1:1 ratio in regard to the presence or absence of dominant white. A few chicks were removed at random from some sire progenies in order to approximately equalize the number of chicks in which dominant white was present and in which it was absent in each sire progeny. The progenies were then combined and were placed in a pen which was divided into sections by wire partitions. The white chicks were placed in one section and the barred chicks in the adjacent section. Two hatches, one week apart, furnished the stock and the above procedure was carried out on each hatch. The birds

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