Exogenous amylase increases gas production and improves in vitro ruminal digestion kinetics of sorghum and corn grains

Abstract

The aim of this study was to evaluate the effect of exogenous amylase on gas production, in vitro dry matter digestibility (IVDMD), and in vitro digestion kinetics of sorghum (Sorghum vulgaris) and two corn hybrids of different grain textures. Ruminal fluid was collected from two rumen-fistulated cows receiving or not exogenous amylase (0.7g kg-1 of dry matter (DM basis)), provided to achieve 396 kilo Novo units kg-1 for amylase activity (DM basis). Gas production was measured after 1, 3, 6, 9, 12, 15, 18, 21, 24, 30, 36, 42 e 48 hours of incubation. Amylase increased gas production (mL) by 5.4%. Corn hybrids have higher in vitro dry matter digestibility than sorghum. Exogenous amylase increased the potential of gas production (A) (P=0.01). There was an effect of hybrid for IVDMD (P<0.01). The addition of exogenous amylase increases the in vitro gas production, improves fermentation kinetics, and increases the production of the ammonia nitrogen of corn and sorghum grains, but does not affect in vitro and dry matter digestibility or the short-chain fatty acids production.

Effect of Different Additives on the Quality of Rehydrated Corn Grain Silage: A Systematic Review

“…The predominant cultivation of corn hybrids in Brazil, with a higher proportion of vitreous endosperm [9][10][11], is negatively related to starch digestibility [12][13][14], making ensiling an advantageous practice in terms of storage management and nutritive value [15][16][17]. In addition, ensiling reduces insect and rodent damage normally seen in dry grains and increases starch digestibility [18][19][20].…”