A Method of Calculating Coefficients of Digestibility of Poultry Feed

The study of the coefficients of digestibility of feeds of farm animals has been extensively used and has contributed much valuable information in regard to the proper selection of rations. The technique involved in these determinations, unfortunately, is open to certain criticisms which are well known and require no comment at this time. The application of the methods to a study of the metabolism of the fowl has been subject to so many further obstacles that much less data has been accumulated for the same, and even these findings are generally considered open to criticism. With the fowl, the determinations are more involved, due to the mixing of the feces and urine in the excreta. Before any calculations are possible, it becomes necessary to estimate the amount of nitrogen in the feces and urine separately. Various investigators have attacked this problem in different ways. One group assumes that the urine . . .