ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (6): 1169-1177.doi: 10.11843/j.issn.0366-6964.2018.06.009

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Effects of Fermented Corn-Soybean Complete Feed on the Growth Performance, Odor Concentration and Bacterial Community in Faeces of Growing Pigs

LIU Zhi-yun, ZHONG Xiao-xia, XIE Yue-wei, XIAO Rong, JIANG Shan, HUANG Jian, HUANG Jin-xiu, ZHOU Xiao-rong*   

  1. Key Laboratory of Pig Industry Sciences of Ministry of Agriculture, Chongqing Academy of Animal Sciences, Chongqing 402460, China
  • Received:2017-10-25 Online:2018-06-23 Published:2018-06-22

Abstract:

This study was conducted to evaluate the effects of fermented complete feed (FCF) on the growth performance, odor concentration and bacterial community in faeces of growing pigs, and evaluate the application effect of FCF in pigs. Complete feed was anaerobic fermented with Bacillus subtilis and Lactobacillus brevis for 3 days. 90 pigs with the about initial weight 22 kg were randomly allotted into 3 treatment groups (antibiotic-free feed group, antibiotic feed group and FCF group) of 30 each. At the end of the experiment(body weight of pigs was up to about 40 kg), the growth performance of pigs was measured and analyzed. The fresh stool sample was collected from each group to determine the odor concentration by gas chromatography. Additionally, the bacterial community was assayed by using the high-throughout DNA sequencing. The results showed that:1) Fermentation of complete feed significantly increased the fat content in feed (P<0.01) and decreased the calcium content (P<0.01), total phosphorus content (P<0.05) and pH (P<0.01). The number of lactic acid bacteria in the FCF was up to 9.67 lg cfu·g-1 and lactic acid content was up to 421.67 mmol·kg-1. 2) Data from the animal experiment indicated that FCF feeding raised the ADFI and ADG of pigs (P<0.05), and reduced the F/G and mortality (P<0.05) compared with the antibiotic-free group. The ADFI of FCF-fed pigs was higher than that of antibiotic-fed pigs (P<0.05). 3) In addition, the indole content in pig faeces was decreased (P<0.05) by the CFC feeding. The skatole and VFA contents showed a similar decreased tendency, however, the p-cresol content showed a rising tendency in FCF group. 4) Importantly, the richness and diversity of faeces bacterial community were improved by the CFC feeding. The relative abundances of phyla including Tenericutes and Saccharibacteria, genera including Clostridium, Turicibacter, Mollicutes, Anaerostipes, Acetitomaculum increased; while the relative abundances of genera including Lactobacillus, Streptococcus, Rikenellaceae, Megasphaera, Oscillospira, Mitsuokella, Prevotella reduced. In conclusion, FCF could improve the growth performance of pigs and the content of p-cresol in faeces, while reduce the content of indole, skatole and VFA in faeces and change the bacterial community in faeces.

Key words: fermented feed, antibiotics, growth performance, odor concentration, bacterial community

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