Determination of appropriate levels of exogenous fibrolytic enzyme supplementation for substrates with different non-fiber carbohydrate/neutral detergent fiber ratios based on in vitro gas production

doi:10.11686/cyxb2017055

Abstract

Abstract: The objective of this study was to determine the appropriate level of exogenous fibrolytic enzyme (EFE) supplementation for substrates with different non-fiber carbohydrates/neutral detergent fiber (NFC/NDF) ratios. The experiment had a cross group design with two factors and five levels. Five substrates with different NFC/NDF ratios (0.85, 1.02, 1.19, 1.36, and 1.53; sub1-5) were supplemented with EFE at five levels (0, 2, 4, 8, and 16 mg/g dry matter/DM) and in vitro gas production, degradation, and fermentation profiles were determined. The results can be summarized as follows: 1) The NFC/NDF ratio influenced total in vitro gas production (GP₄₈) and gas production parameters (b, c, and L) (P<0.05). The interaction between NFC/NDF ratio and EFE level was significant for gas production parameters (P<0.05).In sub1, as the EFE level increased, GP₄₈, b, and c increased (linear and quadratic effect, P<0.05), and the highest GP₄₈, b, and c were in the 16 mg/g EFE treatment; L showed the opposite trend. In the sub2-4 treatments, the highest GP₄₈, b, and c were in the 4 mg/g EFE treatment. 2) The NFC/NDF ratio in the substrate significantly affected the dry matter disappearance rate (DMD), acid detergent fiber degradation rate (ADFD), neutral detergent fiber degradation rate (NDFD), and nitrogen degradation rate (ND) (P<0.05). The additive effects of EFE produced similar results, except for ND. In sub1, as the EFE dose increased, DMD, ADFD, and NDFD linearly increased (P<0.05). The maximum values of DMD, ADFD, and NDFD were in the 16 mg/g EFE treatment in sub1 and in the 4 mg/g EFE treatment in sub2-4 (P<0.05). 3) The fermentation profile differed significantly among substrates with different NFC/NDF ratios and different levels of EFE supplementation (P<0.05), and the two factors had a significant interaction effect (P<0.05) for all fermentation parameters, except for propionate. For sub1-4, as the EFE levels increased, the fermentation profiles of all parameters except for propionate increased or decreased (quadratic effect, P<0.05). In sub1, pH, ammonia-N, and the butyrate molar concentration were higher in the control group than in the 4, 8 and 16 mg/g EFE treatments, but the acetate molar concentration and acetate∶propionate ratio were higher in the 16 mg/g EFE treatment. The sub2-4 treatments showed lower pH and ammonia-N, and higher total volatile fatty acid (TVFA), acetate molar concentration, and acetate∶propionate ratio. 4) In the substrate with NFC/NDF=1.53, EFE supplementation had no effect on in vitro gas production, fiber degradation, or fermentation characteristics (P>0.05). The results of this study showed that the NFC/NDF ratio influenced the response to EFE supplementation; NFC/NDF=0.85, 16 mg/g EFE showed the best fiber degradation, and the optimum EFE dose was 4 mg/g for substrates with NFC/NDF ratios of 1.02, 1.19, and 1.36. There was no positive effect of EFE on the substrate with NFC/NDF=1.53.

CHEN Guang-Ji, SONG Shan-Dan, PENG Zhong-Li, WANG Pu-Chang, WU Jia-Hai, WANG Xiao-Li, GUO Chun-Hua, WANG Zi-Yuan, GAO Yan-Hua, LI Xiao-Dong, BAI Xue, FU Xi-San. Determination of appropriate levels of exogenous fibrolytic enzyme supplementation for substrates with different non-fiber carbohydrate/neutral detergent fiber ratios based on in vitro gas production[J]. Acta Prataculturae Sinica, 2017, 26(7): 116-127.

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