Difference of Growth Performance and Digestive Tract Microbial Diversity of Hu Sheep with Different Residual Feed Intake
MA Wanhao1, LIANG Yusheng1, ZHANG Zhi'an1, DONG Chunxiao1, LI Fei1, LI Fadi1,2, WENG Xiuxiu1
1. State Key Laboratory of Grassland Agro-Ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2. Engineering Laboratory of Mutton Sheep Breeding And Reproduction Biotechnology in Gansu Province, Minqin 733300, China
Abstract：This study was designed to explore the differences of growth performance, rumen and cecum microbial diversity of the Hu sheep with different residual feed intake (RFI). Sixty healthy Hu lambs with body weight of (25.2±2.5) kg were fed the same pellets feed individually, and the pre-trial period was 14 days, while the trial period was 63 days. The RFI of 60 sheep were calculated using dry matter intake (DMI), average daily gain and metabolic midweight multiple regression model, and 12 sheep with the highest RFI (n=6) and lowest RFI (n=6) were chosen to be slaughtered and sampled. Results showed as follows:1) DMI in high RFI group was significantly higher than that in low RFI group (P<0.05), but there were no significant differences in initial body weight, final body weight, average daily gain, feed conversion ratio, GR value and tail fat weight between high and low RFI groups (P>0.05). There was a significant positive correlation between RFI and DMI as well as feed conversion ratio, GR value (P<0.05), and a positive correlation trend between RFI and tail fat weight (0.05 ≤ P<0.10), and no significant correlation between RFI and both initial body weight, final body weight and average daily gain (P>0.05). 2) No effects of RFI on ruminal bacteria richness and diversity indexes were detected (P>0.05), as well as the richness indexes in cecum bacteria (P>0.05). The Shannon index of cecal bacteria in low RFI group was significantly higher than that in high RFI group (P<0.05), while the Simpson index was tended be higher in this group (0.05 ≤ P<0.10). The relative abundance of Rikenellaceae_RC9_gut_group of rumen in high RFI group was significantly lower than that in low RFI group (P<0.05)and the relative abundance of Bacteroides and Ruminococcaceae_UCG-013 group of cecum in low RFI group were significantly higher than those in high RFI group (P<0.05). The above-mentioned results indicate that individuals with high RFI are more likely to deposit body fat, and the effects of different RFI on rumen and cecum microflora of Hu sheep are only reflected in several special genus which may plays an important role in digestion.
马万浩, 梁玉生, 张智安, 董春晓, 李飞, 李发弟, 翁秀秀. 不同剩余采食量的湖羊生长性能和消化道微生物多样性差异的研究[J]. 动物营养学报, 2019, 31(9): 4080-4091.
MA Wanhao, LIANG Yusheng, ZHANG Zhi'an, DONG Chunxiao, LI Fei, LI Fadi, WENG Xiuxiu. Difference of Growth Performance and Digestive Tract Microbial Diversity of Hu Sheep with Different Residual Feed Intake. Chinese Journal of Animal Nutrition, 2019, 31(9): 4080-4091.
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