Effects of bacteriocin-producing Lactiplantibacillus plantarum on bacterial community and fermentation profile of whole-plant corn silage and its in vitro ruminal fermentation, microbiota, and CH4 emissions.

IF 6.3 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE Journal of Animal Science and Biotechnology Pub Date : 2024-08-07 DOI:10.1186/s40104-024-01065-w
Ziqian Li, Samaila Usman, Jiayao Zhang, Yixin Zhang, Rina Su, Hu Chen, Qiang Li, Mengya Jia, Tunde Adegoke Amole, Xusheng Guo
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Abstract

Background: Silage is widely used to formulate dairy cattle rations, and the utilization of antibiotics and methane emissions are 2 major problems for a sustainable and environmentally beneficial ruminant production systems. Bacteriocin has received considerable attention because of its potential as an alternative to antibiotics in animal husbandry. However, the impact of bacteriocin-producing lactic acid bacteria on the microbiological conversion process of whole-plant corn silage and rumen fermentation remains limited. The purpose of this study was to assess the effect of 2 class IIa bacteriocin-producing strains Lactiplantibacillus plantarum ATCC14917 and CICC24194 on bacterial community composition and ensiling profiles of whole-plant corn silage and its in vitro rumen fermentation, microbiota, and CH4 emissions.

Results: Both bacteriocin-producing strains increased the lactic acid concentration in silage fermented for 7 d, whereas the lowest lactic acid was observed in the ATCC14917 inoculated silage fermented for 90 d (P < 0.05). The highest DM content was observed in the CICC24194 treatment (P < 0.05), and the silages treated with both strains had the lowest DM loss (P < 0.05). Bacteriocin-producing strains promoted the growth of Levilactobacillus brevis on d 60 of ensiling. In addition, treatment with bacteriocin-producing strains increased the in vitro DM digestibility (P < 0.05) and decreased the CH4 production (P < 0.05). The results of random forest and clustering analyses at the genus level showed that ATCC14917 increased the relative abundance of the influential variable Bacillus compared to that in the control group, whereas CICC24194 decreased the relative abundance of the influential variable Ruminococcaceae UCG-005. The CICC24194 treatment had the lowest total bacterial, fungal, protozoan, and methanogen populations (P < 0.05).

Conclusions: Both class IIa bacteriocin-producing L. plantarum strains improved the fermentation quality of whole-plant corn silage by regulating the bacterial community composition during ensiling, with CICC24194 being the most effective. Both bacteriocin-producing strains mitigated CH4 production and improved digestibility by modulating the interactions among rumen bacteria, protozoa, methanogens, and the composition of fibrolytic bacteria.

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产生细菌素的植物乳杆菌对全株玉米青贮的细菌群落和发酵概况及其体外瘤胃发酵、微生物群和甲烷排放的影响
背景:青贮饲料被广泛用于配制奶牛日粮,而抗生素的使用和甲烷的排放是可持续和有益环境的反刍动物生产系统面临的两大问题。细菌素因其在畜牧业中替代抗生素的潜力而受到广泛关注。然而,产生细菌素的乳酸菌对全株玉米青贮和瘤胃发酵的微生物转化过程的影响仍然有限。本研究的目的是评估两株产IIa类细菌素的菌株Lactiplantibacillus plantarum ATCC14917和CICC24194对全株玉米青贮的细菌群落组成和贮藏概况及其体外瘤胃发酵、微生物群和CH4排放的影响:结果:两种产细菌素的菌株都能提高发酵 7 d 的青贮饲料的乳酸浓度,而接种 ATCC14917 的青贮饲料发酵 90 d 后的乳酸浓度最低(P 4)(P 结论:两种产细菌素的菌株都能提高发酵 7 d 的青贮饲料的乳酸浓度,而接种 ATCC14917 的青贮饲料发酵 90 d 后的乳酸浓度最低(P 4):两种产IIa类细菌素的植物酵母菌株都能通过调节青贮过程中的细菌群落组成来改善全株玉米青贮的发酵质量,其中CICC24194最为有效。这两种产菌菌株通过调节瘤胃细菌、原生动物、甲烷菌之间的相互作用以及纤维分解菌的组成,减少了 CH4 的产生并提高了消化率。
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