Portal de Periódicos da CAPES

Effects of Bird Resistant Sorghum Grain and Various Commercial Tannins on Chick Performance

1974; Elsevier BV; Volume: 53; Issue: 6 Linguagem: Inglês

10.3382/ps.0532137

1525-3171

W. D. Armstrong, W.R. Featherston, J.C. Rogler,

Meat and Animal Product Quality

Studies were conducted to determine: (1) the effect of protein level on the performance of chicks fed bird resistant sorghum grains; (2) the influence of two levels of dl-methionine in alleviating the detrimental effects of bird resistant sorghum grains; (3) the effects of various sources of commercial tannic acid on chick performance. Bird resistant sorghum (BR64) produced poorer chick performance than nonresistant sorghum (RS671) in sorghum-soybean meal diets containing 16 and 20% dietary protein. Addition of 0.15% dl-methionine to both sorghum grain diets resulted in significant improvements in chick performance, but the magnitude of the response was greater with the bird resistant than with the non-resistant sorghum grain diets. After methionine supplementation, the BR64 diets supported similar chick weight gains as the RS671 diets at both dietary protein levels; however, feed efficiency of chicks fed the BR64 diets remained poorer. In additional studies, non-resistant sorghum RS610 supported significantly better chick performance than either bird resistant sorghum BR64 or sorghum RS610 plus 1% isolated tannic acid. The addition of 0.15% dl-methionine to sorghum RS610 and BR64 diets resulted in significant improvements in chick weight gains with no further increase being noted when 0.30% supplemental dl-methionine was fed. Adding methionine to the RS610 plus tannic acid diet had little effect on chick weight gain. Supplemental methionine resulted in significant improvements in feed conversion with both the BR64 and RS610 plus tannic acid diets. Addition of tannic acids of varying molecular weights to a non-resistant sorghum grain diet resulted in significant depressions in chick performance. The detrimental influence of the tannins did not appear to be closely associated with their molecular weights as all depressions in chick weight gain and feed conversion were roughly similar. The supplementation of 0.15% dl-methionine to diets containing each of the tannic acids had little effect on improving chick performance.