Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (5): 2042-2049.doi: 10.11843/j.issn.0366-6964.2024.05.022

• ANIMAL NUTRITION AND FEEDS • Previous Articles     Next Articles

Effects of Dietary Lysine Supplementation on Fecal Fermentation Parameters and Microbial Flora Structure of Beef Cattle

LONG Tanghui1, ZHAN Yanbo1, LIAO Guanxiang1, CHEN Xinfeng2, ZHANG Jian1, LI Yanjiao1, OUYANG Kehui1, QIU Qinghua1*   

  1. 1. Jiangxi Province Engineering Research Center of Feed Development, Jiangxi Province Key Laboratory of Animal Nutrition, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China;
    2. Ganzhou Lülinwan Agriculture and Animal Husbandry Co. Ltd, Ganzhou 341103, China
  • Received:2023-07-13 Online:2024-05-23 Published:2024-05-27

Abstract: This study was conducted to investigate the effects of dietary lysine supplementation on fecal fermentation parameters, microbial diversity and microflora structure of beef cattle. Four healthy Jinjiang cattle with similar body weight were randomly divided into two groups with two cattle in each group. A repeated 2×2 Latin square design was adopted with the control group fed the basal diet and the treatment group fed the basal diet +0.20% of lysine. The experiment lasted for 30 days and was divided into 2 phases, in which the first 10 days of each phase designated as the adaptation period and the last 5 days being the sample collection period. Fecal samples were collected and then analyzed for fermentation parameters, microbial diversity and microflora structure. The results showed as follows: 1) Dietary supplementation of lysine significantly increased the concentrations of isobutyrate, isovalerate and branched-chain volatile fatty acids in feces (P<0.05); 2) Lysine supplementation had no significant effect on fecal microbial richness and evenness (P>0.05); 3) Taxonomic annotation found that the supplementation of lysine significantly increased the relative abundance of Lachnospiraceae NK4A136 group in feces, whilst the relative abundance of Christensenellaceae R-7 group was decreased as compared to the control group (P<0.05); 4) Both principal coordinate analysis (PCoA) and analysis of similarity (ANOSIM) showed that lysine supplementation had no significant effect on fecal microbial community structure. In conclusion, dietary supplementation of 0.20% lysine could improve the concentrations of isobutyrate, isovalerate and branched-chain volatile fatty acids in feces, as well as alterations in the relative abundances of Lachnospiraceae NK4A136 group and Christensenellaceae R-7 group, but has no significant effect on fecal microbial diversity and microflora structure.

Key words: lysine, feces, fermentation parameter, microbial diversity, microflora structure

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