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Tannin concentration and quality changes in sorghum sorghum bicolor as affected by maturity and sorghum type


Crop Science 26(2): 372-375
Tannin concentration and quality changes in sorghum sorghum bicolor as affected by maturity and sorghum type
Speculation has arisen over the feeding value of silages produced from bird-resistant (high tannin) sorghums [Sorghum bicolor (L.) Moench]. The objectives of this study were to determine the effects of maturity on tannin content in the grain and whole plants of bird-resistant and bird-susceptible grain and forage sorghums, and to determine the relationship between tannin content and other quality attributes such as crude protein (CP), acid-detergent fiber (ADF), neutral-detergent fiber (NDF), and in vitro dry matter digestibility (IVDMD). Four hybrids of each sorghum type were grown in the field, and entire plants were harvested at boot and hard-dough stages of maturity. Grain was harvested at milk, hard-dough, and mature stages. Significant differences (P < 0.05) were measured in grain tannin level among the three sorghum types. Tannin levels were highest in grain of bird-resistant hybrids, with forage-type sorghums being intermediate, and bird-susceptible entries lowest. Significant reductions (P < 0.05) in tannin level occurred in grain of bird-resistant hybrids as the grain matured, but increased significantly with maturity in the whole plant. Changes in whole-plant tannin levels over the season were inconsistent in both bird-susceptible and forage-type sorghums. Crude protein was significantly higher (P < 0.05) in grain at the milk stage than at hard-dough for all hybrids. Significant reductions in CP were observed in all hybrids as the plant matured from boot to hard-dough. Fibrous constituents, ADF and NDF, decreased and IVDMD increased significantly (P < 0.05) as plants matured. Whole-plant tannin level was negatively correlated with CP and IVDMD, and positively related to fibrous constituents. Results of this study indicate that feeding value of the silage of bird-resistant sorghum hybrids would be reduced by high concentration of tannin at the hard-dough stage of maturity.

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Accession: 006578298



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