Daghio Matteo, Ciucci Francesca, Buccioni Arianna, Cappucci Alice, Casarosa Laura, Serra Andrea, Conte Giuseppe, Viti Carlo, McAmmond Breanne M, Van Hamme Jonathan D, Mele Marcello
Dipartimento di Scienze e Tecnologie Agrarie Alimentari Ambientali e Forestali, University of Florence, Florence, Italy.
Dipartimento di Scienze Agrarie, Alimentari e Agro-ambientali, University of Pisa, Pisa, Italy.
Front Microbiol. 2021 Apr 29;12:652031. doi: 10.3389/fmicb.2021.652031. eCollection 2021.
The use of rustic cattle is desirable to face challenges brought on by climate change. Maremmana (MA) and Aubrac (AU) are rustic cattle breeds that can be successfully used for sustainable production. In this study, correlations between two rearing systems (feedlot and grazing) and the rumen microbiota, the lipid composition of rumen liquor (RL), and the growth performance of MA and AU steers were investigated. Bacterial community composition was characterized by high-throughput sequencing of 16S rRNA gene amplicons, and the RL lipid composition was determined by measuring fatty acid (FA) and the dimethyl acetal profiles. The main factor influencing bacterial community composition was the cattle breed. Some bacterial groups were positively correlated to average daily weight gain for the two breeds (i.e., Rikenellaceae RC9 gut group, and in the rumen of MA steers, and Succinivibrionaceae UCG-002 in the rumen of AU steers); despite this, animal performance appeared to be influenced by short chain FAs production pathways and by the presence of H sinks that divert the H to processes alternative to the methanogenesis.
使用乡土牛种有助于应对气候变化带来的挑战。马雷马纳牛（MA）和奥布拉克牛（AU）是乡土牛品种，可成功用于可持续生产。在本研究中，调查了两种饲养系统（饲养场饲养和放牧）与瘤胃微生物群、瘤胃液（RL）的脂质组成以及MA和AU阉牛生长性能之间的相关性。通过对16S rRNA基因扩增子进行高通量测序来表征细菌群落组成，并通过测量脂肪酸（FA）和二甲基缩醛谱来确定RL脂质组成。影响细菌群落组成的主要因素是牛的品种。一些细菌类群与两个品种的平均日增重呈正相关（即MA阉牛瘤胃中的理研菌科RC9肠道菌群，以及AU阉牛瘤胃中的琥珀酸弧菌科UCG-002）；尽管如此，动物的生长性能似乎受短链脂肪酸产生途径以及存在将氢转移到甲烷生成替代过程的氢汇的影响。
