Effects of Different Supplemental Levels of Corn Distillers' Dried Grains with Soluble in Diets on Growth, Body Color, Flesh Color, Serum Biochemical Indexes and Intestinal Microbiota Structure of Channel Catfish (Ictalurus punctatus)

  • GENG Bin ,
  • CHEN Kaijian ,
  • LIU Xiang ,
  • WEI Zehong ,
  • YI Xinwen ,
  • HU Yi ,
  • TANG Tao
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  • 1. Hunan Engineering Research Center for Utilization of Characteristics of Resources, College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China;
    2. State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Sciences, Hunan Normal University, Changsha 410081, China;
    3. Shenzhen Alpha Group Co., Ltd., Shenzhen 518067, China

Received date: 2020-10-22

  Online published: 2021-05-14

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Abstract

A 56-day feeding experiment was conducted to evaluate the effects of different supplemental levels of corn distillers’ dried grains with soluble (DDGS) in diets on the growth, body color, flesh color, serum biochemical indexes and intestinal microbiota structure of channel catfish (Ictalurus punctatus). In this experiment, channel catfish with the body weight of (50.0±0.2) g were used as experimental animals, the diet without corn DDGS was used as the diet of control group, and then supplemented with 3%(group D1), 6%(group D2) and 12% (group D3) of corn DDGS to replace part of soybean meal based on the control group’s diet, respectively, which were as the diets of experimental groups. The control group was set up with 8 replicates, and each experimental group was set up with 5 replicates. There were 50 fish in per replicate, and they were cultured in a reservoir cage (1.5 m×1.5 m×2.0 m). The results showed that supplemented with different levels of corn DDGS to replace part of soybean meal had no significant difference in survival rate, weight gain rate, specific growth rate, feed conversion rate, feeding rate, hepatopancreas-somatic index, condition factor of channel catfish (P>0.05). Compared with the control group, diet supplemented with 6% and 12% corn DDGS could significantly decrease the lightness (L*) value of lateral skin (P<0.05), but had no significant difference in the L* value of abdominal skin and back muscle (P>0.05); the yellow (b*) value of the abdominal and lateral skin and back muscle was significantly higher in the groups D1, D2 and D3 than that in the control group (P<0.05). The immunoglobulin M, complement 4 and total bile acid contents in serum were not significantly different among all groups (P>0.05). Diet supplemented with different levels of corn DDGS did not change the absolute dominant bacteria in intestinal microbiota of channel catfish, moreover, it could increase the relative abundance of beneficial bacteria and decrease the relative abundance of harmful bacteria. In conclusion, these results showed that the addition of 12% corn DDGS to replace part of soybean meal has no adverse effects on the survival, growth, feed utilization, immunity and intestinal microbiota structure of channel catfish, however, it can cause the body color and flesh color to turn yellow.

Cite this article

GENG Bin , CHEN Kaijian , LIU Xiang , WEI Zehong , YI Xinwen , HU Yi , TANG Tao . Effects of Different Supplemental Levels of Corn Distillers' Dried Grains with Soluble in Diets on Growth, Body Color, Flesh Color, Serum Biochemical Indexes and Intestinal Microbiota Structure of Channel Catfish (Ictalurus punctatus)[J]. Chinese Journal of Animal Nutrition, 2021 , 33(5) : 2864 -2874 . DOI: 10.3969/j.issn.1006-267x.2021.05.044

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