氨基酸副产物对白高粱青贮饲料发酵品质及体外消化率的影响

doi:10.3864/j.issn.0578-1752.2022.20.016

Abstract

Abstract:

【Objective】 The aim of this study was to investigate the effects of appropriate amino acid by-products (ABP) on fermentation quality and digestibility of white sorghum, so as to provide ideas for reducing environmental pollution as well as developing and utilizing new feed additives.【Method】In the study, the control group without any additives and the two experimental groups with ABP and ABP+ forage bacteria were used to carry out the experiment of white sorghum silage fermentation. The effects of ABP on the fermentation quality and digestibility of silage were obtained by measuring the feed composition and in vitro digestibility, and scanning electron microscopy (SEM) was used to observe the mechanism of ABP on improving feed fermentation quality and digestibility.【Result】The study has shown that the addition of 2.0% ABP to white sorghum straw could reduce the pH of the feed to 3.65, which was significantly different from the control group (5.13) (P<0.05). The sensory score belonged to the quality silage interval. The lactic acid content of each experimental group (ABP:11.95 g·kg^-1; MIX:15.14 g·kg^-1) was significantly higher than that of the control group (3.54 g·kg^-1) (P<0.01), the content of acetic acid and butyric acid (AA: ABP:2.87 g·kg^-1, MIX:2.75 g·kg^-1; BA: ABP:0.72 g·kg^-1, MIX:0.78 g·kg^-1) was significantly lower than that of the control group (acetic acid:3.85 g·kg^-1; butyric acid: 1.39 g·kg^-1) (P<0.05), and the lactic acid content of the experimental group of ABP+ forage bacteria was 327.85% higher than that of the control group; the content of dry matter (DM) in each group did not change significantly (P>0.05). Neutral detergent fiber (NDF) (ABP:58.67%; MIX:57.67%), acid detergent lignin (ADL)(ABP:4.77%; MIX:4.27%) and ash (Ash) (ABP : 1.56%; mixed: 2.04%) lower than the control group (NDF:63.66%; ADL:5.15%; Ash:2.76%), but the difference was not significant (P>0.05), the acid detergent fiber (ADF) (ABP:35.77%; MIX:28.63%) was significantly lower than that of the control group (40.58%) (P<0.01), and the crude protein content (ABP: 9.65%, MIX:9.67%) was significantly higher than the control group (6.88%) (P<0.01); the in vitro digestibility of each experimental group was DM (ABP: 74.66%; MIX: 80.03%), NDF (ABP: 72.74%; MIX: 83.08%) and ADF (ABP: 68.29%; MIX: 79.56%), which were significantly higher than the control group (DM: 60.67%, NDF: 48.06%; ADF: 44.81%) (P<0.05); the results showed that ABP significantly improved and increased the fermentation quality and digestibility of silage. From the SEM results, it was found that the cross-section and surface structure of the control group were small, and the number of adhering microorganisms was small too, while the wax layer of the surface structure of the treatment group was destroyed and adhered to a large number of forage bacteria, cross-section cells or a large amount of forage bacteria adhered inside the tissue. Therefore, it was preliminarily informed that ABP improved and increased the fermentation quality and digestibility of silage. In addition, the carbon and nitrogen sources provided by the feed bacteria, the wax layer on the surface of the feed was destroyed to promote the adhesion of the feed bacteria and degrade the cell wall cellulose.【Conclusion】2.0% ABP added to white sorghum silage could significantly improve the fermentation quality and digestibility, and had great economic and social significance for the reuse of ABP, the reduction of environmental pollution, and the development and utilization of new feed additives.

Key words: ABP, silage, fermentation quality, in vitro digestibility, SEM

NUERHATI·Silafuer ,WUSIMAN·Yimiti . Effects of Amino Acid By-Products on Fermentation Quality and Digestibility of White Sorghum Silage[J].Scientia Agricultura Sinica, 2022, 55(20): 4065-4074.

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成分Composition	含量Content (mg·kg^-1)	成分Composition	含量Content (mg·kg^-1)
总氮Total nitrogen	1.43×10⁵	钾Potassium	1.21×10⁴
总碳Total carbon	2.57×10⁵	钙Calcium	1.35×10³
硫酸根离子Sulfate ion	2.52×10⁵	钠Sodium	1.26×10⁴
氯离子Chloride	3.18×10⁴	镁Magnesium	1.46×10³

成分Composition	含量Content (%)	成分Composition	含量Content (%)
酸碱度 Potential of hydrogen (pH)	6.08	中性洗涤纤维 Neutral detergent fiber (NDF)	63.56
干物质 Dry matter (DM)	51.79	酸性洗涤纤维 Acid detergent fiber (ADF)	34.94
粗蛋白 Crude protein (CP)	4.25	酸性洗涤木质 Acid detergent lignin (ADL)	10.51
粗纤维素 Crude fiber (CF)	25.60	半纤维素 Hemicellulose (HC)	28.62

组别 Group	pH	气味 Odor	色泽 Color	质地 Texture	总分 Total score
对照 Control	5.13±0.20a	淡霉味 Light musty	暗褐色 Dun	持原状、柔软 Holding the original and soft	70.33±2.02b 中等 Medium
ABP	3.79±0.02b	淡酸酒香味 Sour wine aroma	黄绿色 Kelly	松散、柔软 Loose and soft	87.00±1.00a 优质 High quality
ABP+混合菌 ABP+Mixed bacteria	3.65±0.03b	酸酒香味 Sour flavor	亮黄绿色 Bright kelly	松散、易分离 Loose and easy to separate	88.67±2.03a 优质 High quality

Effects of Amino Acid By-Products on Fermentation Quality and Digestibility of White Sorghum Silage

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