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The aim of this study was to determine the protein and amino acid digestibilities, and apparent m... more The aim of this study was to determine the protein and amino acid digestibilities, and apparent metabolizable energy (AME) contents of sorghum-barley brewers' spent grain (SBBSG), use this information to formulate an appropriate diet for broilers, and determine the effect of SBBSG inclusion on growth, carcass and blood parameters. In experiment one fifteen individually housed broilers were used to determine the apparent digestibilities of nutrients. Another cohort of 15 broilers were raised alongside and nutrient digestibility of key nutrients in wheat bran determined. The AME of SBBSG (6.72 MJ/kg) was higher than previously assumed, whereas the digestibility values of some of the essential amino acids for SBBSG (Lys, Met, Phe, Thr and Val) were generally lower (42.93, 71.6, 55.47, 75.26, and 62.66%) than previously assumed. In experiment two, diets were formulated based on nutrient availability values from trial one and fed to two hundred and fifty day-old chicks. Birds were allotted to five diets (TI, T2, T3, T4 and T5, representing 0, 4, 8 12 and 16% SBBSG, respectively). Average daily feed intake (ADFI) for birds on T1 and T2 were similar (105.6 and 102.3g) and these were higher (P<0.05) than ADFI for birds on T3 to T5 (92.2, 93.4 and 88.3 respectively). There were no treatment differences in average daily gain (ADG) and final body weight (FNBW). However as the level of dietary SBBSG increased, feed conversion efficiency (FCE) improved. Carcass parameters were not affected by the level of dietary SBBSG. Blood parameters were within acceptable ranges for broilers. It can be concluded that inclusion of SBBSG up to 16% in diets that are formulated based on nutrient availability, will have no adverse effects on broiler performance and blood profile. Results of this trial indicate that nutrient availability is key in effective feed formulation and broiler productivity.

The aim of this study was to determine the protein and amino acid digestibilities, and apparent m... more The aim of this study was to determine the protein and amino acid digestibilities, and apparent metabolizable energy (AME) contents of sorghum-barley brewers' spent grain (SBBSG), use this information to formulate an appropriate diet for broilers, and determine the effect of SBBSG inclusion on growth, carcass and blood parameters. In experiment one fifteen individually housed broilers were used to determine the apparent digestibilities of nutrients. Another cohort of 15 broilers were raised alongside and nutrient digestibility of key nutrients in wheat bran determined. The AME of SBBSG (6.72 MJ/kg) was higher than previously assumed, whereas the digestibility values of some of the essential amino acids for SBBSG (Lys, Met, Phe, Thr and Val) were generally lower (42.93, 71.6, 55.47, 75.26, and 62.66%) than previously assumed. In experiment two, diets were formulated based on nutrient availability values from trial one and fed to two hundred and fifty day-old chicks. Birds were allotted to five diets (TI, T2, T3, T4 and T5, representing 0, 4, 8 12 and 16% SBBSG, respectively). Average daily feed intake (ADFI) for birds on T1 and T2 were similar (105.6 and 102.3g) and these were higher (P<0.05) than ADFI for birds on T3 to T5 (92.2, 93.4 and 88.3 respectively). There were no treatment differences in average daily gain (ADG) and final body weight (FNBW). However as the level of dietary SBBSG increased, feed conversion efficiency (FCE) improved. Carcass parameters were not affected by the level of dietary SBBSG. Blood parameters were within acceptable ranges for broilers. It can be concluded that inclusion of SBBSG up to 16% in diets that are formulated based on nutrient availability, will have no adverse effects on broiler performance and blood profile. Results of this trial indicate that nutrient availability is key in effective feed formulation and broiler productivity.