Sorghum (Sorghum bicolor) is similar in composition to corn but contains the anti-nutritive factor tannin. Tannins (phenolics) inhibit digestive enzyme activity and form complexes with protein that resist digestion. The maximum amount of sorghum tannin that can be included in broiler diets without adversely affecting growth rate or feed efficiency is unclear. Research suggest that the maximum level for dietary tannins is between 1.3 and 2.5% tannin on a dry matter basis.
Sorghum is limiting in several amino acids, including lysine, methionine and glycine. There is very little data available on the effect of sorghum inclusion on meat yield and quality, but one study has shown a significant reduction in both eviscerated carcass weight and dressing out percentage of broilers reared on sorghum.