Effects of Dietary Bacillus subtilis or Enterococcus faecalis on Growth Performance, Nutrient Digestibility and Nitrogen Metabolism of Minks during Growing Period

NIE Hao, ZHANG Tietao, CUI Hu, WANG Zhongcheng, XIE Jingjing, GAO Xiuhua

doi:10.3969/j.issn.1006-267x.2017.11.021

2017 , Vol. 29 >Issue 11: 4003 - 4009

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.11.021

Molecular Nutrition

Effects of Dietary Bacillus subtilis or Enterococcus faecalis on Growth Performance, Nutrient Digestibility and Nitrogen Metabolism of Minks during Growing Period

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1. Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Institute of Feed Research, Chinese Academy of Agriculture Sciences, Beijing 100081, China;
2. Institute of Special Animal and Plant Science, Chinese Academy of Agriculture Sciences, Changchun 130112, China

Received date: 2017-05-05

Online published: 2017-10-31

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Abstract

This experiment was conducted to study the effects of dietary Bacillus subtilis or Enterococcus faecalis on growth performance, nutrient digestibility and nitrogen metabolism of minks during growing period. The experiment was designed using a single factor complete randomized trial. Seventy healthy male 60-day-age minks with average weight of (957.37±93.96) g were randomly divided into 7 groups with 10 replicates per group and 1 mink per replicate. GroupⅠ (control group) was fed a basal diet, groups Ⅱ, Ⅲ and Ⅳ were fed the basal diet supplemented with 1×10⁹, 1×10¹⁰ and 1×10¹¹ CFU/kg Bacillus subtilis, and groups Ⅴ, Ⅵ and Ⅶ were fed the basal diet supplemented with 1×10⁸, 1×10⁹ and 1×10¹⁰ CFU/kg Enterococcus faecalis, respectively. The adaptation period lasted for 7 days and the formal trial period lasted for 60 days. The results showed as follows:1) the final weight of group Ⅲ was significantly higher than that of group Ⅰ (P<0.05), the average daily feed intake of group Ⅵ was significantly lower than that of group Ⅰ(P<0.05), the average daily gain and feed to gain ratio had no significant difference among all groups (P>0.05). 2) The dry matter digestibility of groups Ⅱ, Ⅲ and Ⅴ was significantly higher than that of group Ⅰ (P<0.05), and the dry matter digestibility of group Ⅴ was significantly higher than that of groups Ⅰ, Ⅳ, Ⅵ and Ⅶ (P<0.05); the protein digestibility of group Ⅴ was significantly higher than that of groups Ⅰ and Ⅶ (P<0.05), the fat digestibility had no significant difference among all groups (P>0.05). 3) The fecal nitrogen content of groups Ⅳ, Ⅴ and Ⅵ was significantly lower than that of group Ⅰ(P<0.05), the urinary nitrogen content of groups Ⅴ and Ⅵ was significantly lower than that of group Ⅰ (P<0.05). The nitrogen deposition of test groups was higher than that of group Ⅰ, but had no significant difference (P>0.05). The net protein utilization of groups Ⅲ and Ⅴ was significantly higher than that of group Ⅰ (P<0.05), and the biological value of protein of group Ⅲ was significantly higher than that of group Ⅰ (P<0.05). In conclusion, when dietary supplemented with 1×10¹⁰ CFU/kg Bacillus subtilis or 1×10⁸ CFU/kg Enterococcus faecalis, the growth performance, nutrient digestibility, nitrogen deposition, net protein utilization and biological value of protein of minks are more preferably.

Key words： Bacillus subtilis; Enterococcus faecalis; minks; growth performance; nutrient digestibility; nitrogen metabolism

Cite this article

NIE Hao, ZHANG Tietao, CUI Hu, WANG Zhongcheng, XIE Jingjing, GAO Xiuhua . Effects of Dietary Bacillus subtilis or Enterococcus faecalis on Growth Performance, Nutrient Digestibility and Nitrogen Metabolism of Minks during Growing Period[J]. Chinese Journal of Animal Nutrition, 2017 , 29(11) : 4003 -4009 . DOI: 10.3969/j.issn.1006-267x.2017.11.021

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