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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (10): 154-166.DOI: 10.11686/cyxb2021167

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Effects of arginine level on rumen flora population structure and fermentation in weaning sika deer

Yu-jie FAN(), Hua-zhe SI, Xiao-xu WANG, Qian-long YANG, Xin-yu ZHANG, Wei ZHONG, Kai-ying WANG()   

  1. State Key Laboratory of Special Economic Animal Molecular Biology,Institute of Special Animal and Plant Science,Chinese Academy of Agricultural Sciences,Changchun 130112,China
  • Received:2021-04-28 Revised:2022-01-28 Online:2022-10-20 Published:2022-09-14
  • Contact: Kai-ying WANG

Abstract:

This study investigated the effects of arginine level on rumen fermentation and flora population structure of weaning sika deer. Twelve three month old male sika deer with similar body weight were randomly divided into three groups of four. All groups were fed the same basal diet containing 12.28% crude protein (CP) with differing levels of arginine: 0.80% (A), 1.08% (B), and 1.26% (C). The experimental period was 50 days. On the last day, 20 mL rumen fluid was extracted from each animal, rumen fermentation parameters were measured, and DNA was extracted to analyze rumen bacterial diversity. It was found that: 1) The content of ammonia nitrogen in rumen fluid of Group B was higher (P<0.01) than that in Group C, while the contents of acetic acid, butyric acid and isobutyric acid in Group B were lower (P<0.01) than those in Group A. The content of total volatile fatty acids in Group B was lower (P<0.05) than that in Group A and the ratio of acetate to propionate in Group B was lower (P<0.01) than that in Groups A and C. 2) The ACE index of Group B was higher (P<0.05) than that of Group C while the Chao1 index of Group B was significantly higher than that of Groups A and C (P<0.05) and the Simpson index of group B was higher (P<0.01) than that of Groups A and C and the Shannon index showed the opposite pattern. The bacterial diversity of Group A differed (P<0.05) from that of Groups B and C. 3) Taxonomically, at the phylum level, the relative abundance of Bacteroidetes in Group B was lower (P<0.01) than that in Group A, the relative abundance of Firmicutes was higher (P<0.05) than in Group A, and the relative abundance of Proteobacteria in Group B was higher (P<0.05) than in Groups A and C. At the genus level, the relative abundance of unidentified_Prevotellaceae did not differ (P>0.05) among the three groups, the relative abundance of Methanobrevibacter in Group A was higher (P>0.01) than in Groups B and C, the relative abundance of Succinivibrio in Group B was higher than in Group A (P<0.01) and Group C (P<0.05). In conclusion, 1.08% dietary arginine level significantly improved the microbial richness of sika deer, changed the bacterial diversity and the taxonomic structure of dominant bacteria, and thus promoted rumen propionic acid fermentation, and enhanced the body energy supply.

Key words: weaning sika deer, arginine, rumen fermentation, flora population structure