The use of grain sorghums in poultry diets has increased greatly during the past few years. Consumption of the grain in the field by wild birds is a major problem and has prompted the development of several bird-resistant varieties, the majority of these being brown seeded. The fact that bird resistance is attributed to the grain's tannin content has caused concern regarding the efficacy of its use in poultry diets.Chang and Fuller (1964) reported that growth depressions resulting from the feeding of high-tannin grain sorghums were similiar to those produced by equivalent levels of tannic acid. The feeding of grain sorghums high in tannin content resulted in significantly lower body weights, but feed consumption was not decreased. Therefore, it was believed that true tannin toxicity had been demonstrated. Supplementing diets containing grain sorghums of high and low tannin content with twice the normal supplemental levels of choline and methionine .