Growth Values of Proteins from Commercial Animal Products

In a previous paper1 data were presented which indicated that the brand of meat meal we used was deficient in the aminoacid tryptophane. The same brand of meat meal was used in the experiments reported in this paper. In view of the fact that so little was known concerning this meat meal, experiments were planned to test the growth value of its proteins for young chickens. EXPERIMENTAL Two trials were conducted with cross bred chicks in the first and Barred Plymouth Rock chicks in the second. The cross-bred chicks were from the same cross as described elsewhere.2 Only one brand of meat meal was used in these tests. The experimental procedure was the same for these trials as has been reported in the first paper of this series.2 Table 1 gives the composition of the rations which were fed as mash rations. RESULTS Trial I Seventeen newly hatched crossbred chicks . . .