氨基酸副产物对青贮饲料发酵品质及消化率的影响

doi:10.16431/j.cnki.1671-7236.2020.10.017

Abstract

Abstract: This study was conducted to investigate the effects of amino acid by-products(ABP) on fermentation quality and digestibility of red sorghum and sweet corn,and explore the mechanism of action by scanning electron microscopy(SEM).There was a control group without additives,an experimental group Ⅰ with 2.0% ABP,and an experimental group Ⅱ with 2.0% ABP mixed with forage fungus for red sorghum and sweet corn,respectively.The results showed that:①2.0% ABP reduced the pH of red sorghum and sweet corn silage to 3.90 and 3.28 respectively,and they were belonged to the high-quality silage range by sensory evaluations.②For the red sorghum silage,compared with the control group,the dry matter (DM) contents of the experimental groups were slightly increased,but the difference were not significant (P>0.05),while the crude protein (CP) contents were significantly increased (P<0.05).The fiber content of the experimental group Ⅱ was slightly lower than the control group,but the difference was not significant (P>0.05).The lactic acid and acetic acid contents of experimental groups were significantly higher than that of control groups (P<0.05).The content of butyric acid in experimental group Ⅱ was significantly lower than that of the other groups (P<0.05).The dry matter and neutral washing fiber (NDF) digestibilities of the experimental groups were higher than the control group,but the difference were not significantly (P>0.05),and acidic washing fiber(ADF) digestibility was significantly higher than control group (P<0.05).③ For sweet corn silage,the dry matter and fiber contents of experimental groups were lower than those in the control group,but the differences were not significant (P>0.05),the crude protein content was significantly higher than the control group (P<0.05).The lactic acid content of the experimental group Ⅰ was significantly higher than the other groups (P<0.05),the acetic acid content of experimental group Ⅱ was significantly higher than that of the other groups (P<0.05),and the butyric acid content of each experimental group was significantly higher than the control group (P<0.05).The digestibilities of the experimental groups were lower than the control group but higher than the raw materials,and the differences of dry matter and acid washing fiber digestibilities were significant (P<0.05).④SEM results showed that ABP promoted the adhesion of forage bacteria by destroying the waxy layer on the surface of red sorghum silage,and degraded the cell wall fiber components to improve the quality of the silage fermentation and improve the digestibility during the silage process.But the destructive effect of ABP on sweet corn silage was not obvious.In conclusion,the addition of ABP could improve the fermentation quality and digestibility of red sorghum,but the effect on sweet corn silage was not obvious.

Key words: amino acid by-products (ABP); silage; fermentation quality; digestibility; SEM

CLC Number:

S816.5⁺3

NUERHATI·Silafuer, MAIMAITITUERSUN·Abudukeremu, WUSIMAN·Yimiti. Effects of Amino Acid By-products on Fermentation Quality and Digestibility of Silage[J]. China Animal Husbandry & Veterinary Medicine, 2020, 47(10): 3183-3192.

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Effects of Amino Acid By-products on Fermentation Quality and Digestibility of Silage

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