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The effects of stage of maturity and lactic acid bacteria inoculants on the ensiling characteristics, aerobic stability and in vitro digestibility of whole‐crop oat silages
Grassland Science ( IF 1.3 ) Pub Date : 2020-05-10 , DOI: 10.1111/grs.12285
Tingting Jia 1 , Bing Wang 1 , Zhu Yu 1 , Zhe Wu 1
Affiliation  

This study evaluated the effect of three isolated lactic acid bacteria (LAB) inoculants on the ensiling characteristics, aerobic stability and in vitro digestibility of low dry matter whole‐crop oat silages (WCOS). The oats were harvested at two stages of maturity, boot and filling stages, and then inoculated with 1 × 106 cfu/g fresh material of Lactobacillus plantarum (LP), Lactobacillus rhamnosus (LR) and Lactobacillus buchneri (LB). After 45 days of ensiling, the three LAB inoculants increased lactic acid (LA) concentrations (p < .05) and decreased ammonia nitrogen (NH3‐N) content (p < .05) for both of the two stages of WCOS; the LP‐ and LR‐treated silages exhibited lower pH values and higher Flieg's points than the control and LB‐treated silages (p < .05); LB‐treated silages resulted in higher acetic acid contents than in the other treated silages (p < .05). After exposure to air for 7 days, the control and LB treatments had higher aerobic stability than the LP and LR treatments (p < .05). The Flieg's points and aerobic stability at the filling stage were greater than that at the boot stage. With no LAB inoculants, the in vitro dry matter digestibility (IVDMD) at the boot stage was higher than that at the filling stage. At the filling stage, LB‐ and LR‐treated silages had higher IVDMD than the control and LP‐treated silages (p < .05). It was concluded that the fermentation quality and aerobic stability of oats harvested at the filling stage was higher than that at the boot stage. LP and LR inoculants improved the fermentation quality but reduced the aerobic stability of WCOS. The IVDMD of WCOS at the filling stage was improved by adding LB and LR inoculants.

中文翻译:

成熟期和乳酸菌接种剂对全麦燕麦青贮饲料保鲜特性,需氧稳定性和体外消化率的影响

这项研究评估了三种分离的乳酸菌(LAB)接种剂对低干物质全麦燕麦青贮饲料(WCOS)的保鲜特性,需氧稳定性和体外消化率的影响。在成熟,启动和灌装两个阶段收获燕麦,然后接种1×10 6  cfu / g新鲜植物乳杆菌(LP),鼠李糖乳杆菌(LR)和布氏乳杆菌(LB)。接种45天后,三种LAB接种剂增加了乳酸(LA)的浓度(p  <.05)和降低了氨氮(NH 3 -N)的含量(p <.05)对于WCOS的两个阶段;与对照和LB处理的青贮饲料相比,LP和LR处理的青贮饲料显示出较低的pH值和较高的弗利格点(p  <.05);LB处理的青贮饲料比其他处理的青贮饲料产生更高的乙酸含量(p  <.05)。暴露于空气中7天后,对照和LB处理的有氧稳定性高于LP和LR处理(p  <.05)。灌装阶段的Flieg点和有氧稳定性要高于靴子阶段。没有LAB孕育剂,启动阶段的体外干物质消化率(IVDMD)高于灌装阶段。在灌装阶段,LB和LR处理的青贮饲料的IVDMD高于对照和LP处理的青贮饲料(p  <.05)。结论是,灌浆期收获的燕麦的发酵品质和有氧稳定性高于启动期。LP和LR接种剂改善了发酵质量,但降低了WCOS的需氧稳定性。通过添加LB和LR接种剂可以改善WCOS在灌装阶段的IVDMD。
更新日期:2020-05-10
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