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Micronized Sorghum Grain. II. Influence in In Vitro Digestibility, In Vitro Gas Production and Gelatinization^{1, 2,}

Oklahoma State University⁴, Stillwater 74074

Abstract

Studies were conducted to investigate the effects of micronizing sorghum grain on in vitro dry matter disappearance (IVDMD), in vitro gas production and gelatinization. In trial 1, micronized sorghum (MS) was compared with dry rolled sorghum (DRS). In trial 2, three densities of MS (412, 322 and 232 g/l) were compared to DRS. In trial 1, MS showed an increased (P < .05) IVDMD over DRS during each of three IVDMD incubation periods, 6, 12 and 24 hr; moreover, as the degree of micronization increased in trial 2 so did the IVDMD (P < .05) during all three incubation periods (MS-232 > MS-322 > MS-412 > DRS). Gas production studies showed a significantly higher rate of gas production from the micronized grain (P < .01), indicating increased starch availability. Moreover, gas production (P < .01) and gelatinization (P < .05) increased with degree of micronization.

¹ Journal article 2781 of the Agricultural Experiment Station, Oklahoma State University, Stillwater.

² The assistance of Roger Johnson in statistical analysis is greatly appreciated.

³ Present address: Ralston Purina Co., Oklahoma City, Oklahoma.

⁴ Department of Animal Sciences and Industry.

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