Reducing Protein Concentrates in Rations of Chicks at Different Ages

EXPERIMENTS have shown that during the first 8 to 12 weeks the growth rate of chicks increases as the level of protein in the ration is increased, at least up to a level of 18 or 20 percent of protein. At this station (1932a) a combination of 15 percent of meat and bone scraps (50 percent protein) and 5 or 6 percent of dried milk has given more rapid growth during the first 8 to 10 weeks than 12 percent of meat scraps and 4 percent of dried milk. In other trials at this station (Roberts, 1934) a combination of meat and bone scraps and meat meal, to supply an amount of protein equivalent to that contained in 21 percent of meat and bone scraps, and 7 percent of dried milk, and also a combination of 10 percent of meat and bone scraps, 7 or 14 percent of soybean oil . . .