High Protein Mashes for Broilers

Abstract

THE commonly accepted level of protein in starter mashes for chicks is 19–21 percent. If lower levels of protein are fed, rates of growth are at first comparatively slow. When higher levels of protein are fed it is usually concluded that there is no advantage in efficiency of feed utilization gained by this practice (Heuser, 1941).PROCEDUREThis paper presents the results of three series of tests made with Single Comb White Leghorn cockerels.1 Twenty-five or 26 chicks were used in each group in all tests. In the first and third tests all of the birds received proved to be cockerels. In the second test the number of females varied from 0 to 4 in each group of chicks.The all-mash rations used are shown in Table 1. The estimated protein was 20 and 29 percent in mash A and B, respectively. Actual analysis showed the protein content of these .