Effects of Different Dietary Astragalus Polysaccharide Supplemental Levels on Performance, Serum Biochemical and Immune Parameters and Intestinal Morphology of Silver Foxes during Winter Fur-Growing Period

ZHONG Wei, ZHANG Ting, SUN Weili, SUN Xuyang, LI Guangyu

doi:10.3969/j.issn.1006-267x.2019.03.036

2019 , Vol. 31 >Issue 3: 1301 - 1308

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.03.036

Molecular Nutrition

Effects of Different Dietary Astragalus Polysaccharide Supplemental Levels on Performance, Serum Biochemical and Immune Parameters and Intestinal Morphology of Silver Foxes during Winter Fur-Growing Period

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State Key Laboratory of Special Economic Animal Molecular Biology, Institute of Special Animal and Plant Science, Chinese Academy of Agriculture Sciences, Changchun 130112, China

Received date: 2018-08-03

Online published: 2019-03-18

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Abstract

This experiment was conducted to study the effects of different dietary Astragalus polysaccharide (APS) supplemental levels on performance, serum biochemical and immune parameters and intestinal morphology of silver foxes during the winter fur-growing period. Forty healthy 157-day-old male silver foxes with average body weight of (5 458±54) g were randomly divided into 4 groups with 10 replicates per group and 1 fox per replicate. Foxes in each group were fed basal diets supplemented with 0 (control group), 100 (group Ⅰ), 200 (group Ⅱ) and 300 mg/kg (group Ⅲ) APS, respectively. The experiment was 7 days for adaption and 40 days for trial period. The results showed as follows:1) the average daily gain of group Ⅱ was significantly higher than that of groups Ⅰ and Ⅲ (P<0.05), but had no significant difference compared with that of the control group (P>0.05). The ratio of feed to gain of group Ⅱ was significantly lower than that of group Ⅲ (P<0.01), significantly lower than that in group Ⅰ (P<0.05), but had no significant difference compared with that of the control group (P>0.05). No significant differences were found in average daily feed intake, body length, fresh fur length, guard hair length and under hair length among all groups (P>0.05). 2) The serum low density lipoprotein cholesterol content of group Ⅱ was significantly lower than that of the control group (P<0.01), but had no significant difference compared with that of groups Ⅰ and Ⅲ (P>0.05). The serum glucose content of group Ⅱ was significantly lower than that of the control group and group Ⅰ (P<0.05), but had no significant difference compared with that of group Ⅲ (P>0.05). No significant differences were found in the contents of triglyceride, cholesterol and high density lipoprotein cholesterol in serum among all groups (P>0.05). 3) No significant differences were found in the contents of total protein, albumin and globulin and albumin/globulin in serum among all groups (P>0.05). 4) The serum interleukin-2 content of group Ⅱ was significantly higher than that of other 3 groups (P<0.05 or P<0.01), and there was no difference among the other 3 groups (P>0.05). No significant differences were found in the contents of immunoglobulin A, immunoglobulin M, immunoglobulin G, complement 3, complement 4, tumor necrosis factor in serum among all groups (P>0.05). 5) The villous height of group Ⅱ was significantly higher than that of the control group and groups Ⅰ and Ⅲ (P<0.01). The crypt depth of group Ⅱ was significantly lower than that of the control group (P<0.01), and significantly lower than that of group Ⅲ (P<0.05), but had no significant difference compared with that of group Ⅰ (P>0.05). The villous height/crypt depth of group Ⅱ was significantly higher than that of the control group and group Ⅲ (P<0.01), but had no significant difference compared with that of group Ⅰ (P>0.05). In conclusion, diet added 200 mg/kg APS can reduce the contents of glucose and low density lipoprotein cholesterol in serum, enhance serum interleukin-2 content, and improve intestinal morphology, which is beneficial to increase the digestion and absorption capacity of intestinal tract, but do not improve the performance of silver foxes during the winter fur-growing period.

Key words： Astragalus polysaccharide; silver foxes; performance; serum biochemical parameters; intestinal morphology

Cite this article

ZHONG Wei, ZHANG Ting, SUN Weili, SUN Xuyang, LI Guangyu . Effects of Different Dietary Astragalus Polysaccharide Supplemental Levels on Performance, Serum Biochemical and Immune Parameters and Intestinal Morphology of Silver Foxes during Winter Fur-Growing Period[J]. Chinese Journal of Animal Nutrition, 2019 , 31(3) : 1301 -1308 . DOI: 10.3969/j.issn.1006-267x.2019.03.036

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