Growth Values of Proteins from Commercial Animal Products

The value of tankage for laying stock has been repeatedly demonstrated at various experiment stations. Philips1 was perhaps the first to use tankage as the chief protein concentrate in a ration for mature birds. He states: “Although the egg production varied from year to year, the general tendency was for meat scraps and tankage to be equally efficient.” Mitchell, Kendall, and Card.2 working with young chicks in order to determine their vitamin requirements, used tankage as the sole source of animal protein concentrate in the ration with apparently satisfactory results. Hughes, Titus, and Witham,3 in a study of the prevention of rickets in growing chicks, also used tankage as the animal protein concentrate in the ration. These workers were evidently satisfied with the rate of growth as they do not make any statement to the contrary. A survey of the literature has not revealed any data from experiments in which . . .