Effects of Dietary Vitamin A Supplemental Level on Growth Performance, Nutrient Digestibility, Nitrogen Metabolism and Serum Biochemical Indexes of Blue Foxes during Growing Period

YANG Yahan; ZHANG Ting; ZHANG Tietao; BAO Kun; LIU Hanlu; WANG Zhuo; WANG Kaiying; LI Guangyu

doi:10.3969/j.issn.1006-267x.2019.12.031

2019 , Vol. 31 >Issue 12: 5655 - 5663

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.12.031

Effects of Dietary Vitamin A Supplemental Level on Growth Performance, Nutrient Digestibility, Nitrogen Metabolism and Serum Biochemical Indexes of Blue Foxes during Growing Period

YANG Yahan ,
ZHANG Ting ,
ZHANG Tietao ,
BAO Kun ,
LIU Hanlu ,
WANG Zhuo ,
WANG Kaiying ,
LI Guangyu

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Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130112, China

Received date: 2019-05-23

Online published: 2019-12-13

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Abstract

The aim of study was to investigate the effects of dietary vitamin A supplemental level on growth performance, nutrient digestibility, nitrogen metabolism and serum biochemical indexes of blue foxes during growing period. According to a single factor trial design, ninety healthy male blue foxes were randomly divided into 6 groups with 15 replicates in each group and 1 fox in each replicate. Foxes in the 6 groups were fed experimental diets which the vitamin A supplemental levels were 0 (group Ⅰ), 5 000 (group Ⅱ), 10 000 (group Ⅲ), 15 000 (group Ⅳ), 20 000 (group Ⅴ) and 25 000 IU/kg (group Ⅵ) based on dry matter, respectively. The experiment included 7 days adaptation period and 60 days test period. The results showed as follows:1) dietary vitamin A supplemental level had no significant effects on the final weight, average daily gain, average daily feed intake and feed to gain ratio of blue foxes (P>0.05). 2) Dietary vitamin A supplemental level had no significant effects on the dry matter intake, dry matter output, dry matter digestibility and protein digestibility of blue foxes (P>0.05). The fat digestibility of group Ⅲ was significantly higher than that of groups Ⅰ, Ⅳ, Ⅴ and Ⅵ (P<0.05). 3) Dietary vitamin A supplemental level had no significant effects on the nitrogen intake, fecal nitrogen, urine nitrogen, nitrogen deposition, net protein utilization and biological value of protein of blue foxes (P>0.05). The serum urea nitrogen content of group Ⅴ was significantly lower than that of groups Ⅰ, Ⅲ, Ⅳ and Ⅵ (P<0.05). 4) Dietary vitamin A supplemental level had no significant effects on the vitamin D content and alanine aminotransferase activity in serum of blue foxes (P>0.05). The serum vitamin A content of group Ⅵ was significantly higher than that of other groups (P<0.05), the serum aspartate aminotransferase activity of group Ⅱ was significantly higher than that of groups Ⅲ and Ⅳ (P<0.05), the serum low density lipoprotein content of groups Ⅰ, Ⅱ, Ⅲ and Ⅳ was significantly lower than that of groups Ⅴ and Ⅵ (P<0.05), and the serum high density lipoprotein content of groups Ⅰ, Ⅱ, Ⅲ and Ⅳ was significantly higher than that of group Ⅵ (P<0.05). The serum triglyceride content of groups Ⅰ, Ⅱ and Ⅲ was significantly higher than that of group Ⅳ (P<0.05), and significantly lower than that of groups Ⅴ and Ⅵ (P<0.05); the serum total cholesterol content of group Ⅰ was significantly higher than that of group Ⅵ (P<0.05), and significantly lower than that of groups Ⅱ, Ⅲ and Ⅳ (P<0.05). In conclusion, under this experimental conditions, dietary supplementation of vitamin A above 5 000 IU/kg have no significant effects on the growth performance of blue foxes during growing period, dietary supplementation of 10 000 IU/kg vitamin A significantly increase the fat digestibility. Dietary vitamin A supplemental level have a certain effect on serum biochemical indexes of blue foxes during growing period.

Key words： blue foxes; vitamin A; growth performance; nutrient digestibility; serum biochemical indexes

Cite this article

YANG Yahan , ZHANG Ting , ZHANG Tietao , BAO Kun , LIU Hanlu , WANG Zhuo , WANG Kaiying , LI Guangyu . Effects of Dietary Vitamin A Supplemental Level on Growth Performance, Nutrient Digestibility, Nitrogen Metabolism and Serum Biochemical Indexes of Blue Foxes during Growing Period[J]. Chinese Journal of Animal Nutrition, 2019 , 31(12) : 5655 -5663 . DOI: 10.3969/j.issn.1006-267x.2019.12.031

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