Effects of Different Copper Sources and Levels on Growth Performance, Nutrient Digestibility and Serum Indices of Growing Blue Foxes

LIU Zhi, SUN Haoran, WU Xuezhuang, ZHANG Tietao, GUO Jungang, CUI Hu, WANG Zhongcheng, NIE Hao, XING Xiumei, YANG Fuhe, GAO Xiuhua

doi:10.3969/j.issn.1006-267x.2018.08.026

2018 , Vol. 30 >Issue 8: 3091 - 3099

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.08.026

Molecular Nutrition

Effects of Different Copper Sources and Levels on Growth Performance, Nutrient Digestibility and Serum Indices of Growing Blue Foxes

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1. Key Laboratory for Feed Biotechnology of Ministry of Agriculture, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130123, China;
3. College of Animal Science, Anhui Science and Technology University, Bengbu 233003, China

Received date: 2018-01-03

Online published: 2018-08-18

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Abstract

This experiment was conducted to investigate the effects of dietary different copper sources and levels on growth performance, nutrient digestibility and serum indices of growing blue foxes. One hundred 55-day-old blue foxes were selected and randomly divided into 5 groups with 20 replicates per group and 1 fox per replicate. Foxes were fed the basal diet supplemented with 0, 50 and 100 mg/kg copper from copper sulphate (CuSO₄·5H₂O) or copper methionine (Met-Cu), two copper sources shared the 0 supplemental group as the control group. The pre-experimental period lasted for 7 days and the formal experimental period lasted for 60 days. The results showed as follows:1) dietary copper level had significant effect on the average daily gain of growing blue foxes (P<0.01), and had significant effect on the ratio of feed to gain of growing blue foxes (P<0.05). Dietary copper source had no significant effects on the average daily feed intake, average daily gain and ratio of feed to gain of growing blue foxes (P>0.05). 2) Dietary copper level had significant effects on the crude protein digestibility and fecal copper content of growing blue foxes (P<0.01), and had significant effects on the dry matter digestibility and ether extract digestibility of growing blue foxes (P<0.05). Dietary copper source had significant effect on the fecal copper content of growing blue foxes (P<0.05), and the fecal copper content in copper methionine group was significantly higher than that in copper sulphate group (P<0.05). Dietary copper source had no significant effects on the dry matter digestibility, ether extract digestibility, crude protein digestibility and nitrogen retention of growing blue foxes (P>0.05). 3) Dietary copper source and level had significant effect on the serum urea nitrogen content of growing blue foxes (P<0.01), the serum urea nitrogen content in 50 and 100 mg/kg copper supplemental group was significantly higher than that in control group (P<0.01), and the serum urea nitrogen content in copper methionine group was significantly higher than that in copper sulphate group (P<0.01). Dietary copper source and level had no significant effects on the contents of total protein, albumin, globulin, copper, iron and activities of aspartate aminotransferase and alanine aminotransferase in serum of growing blue foxes (P>0.05). In conclusion, copper methionine has a similar growth-promoting effect like copper sulphate in the diet of growing blue foxes. Furthermore, copper methionine is more effective and low environmental emission, which is a more efficient and environmentally organic copper source for the diet of blue foxes.

Key words： copper source; copper level; growing period; growth performance; blue foxes

Cite this article

LIU Zhi, SUN Haoran, WU Xuezhuang, ZHANG Tietao, GUO Jungang, CUI Hu, WANG Zhongcheng, NIE Hao, XING Xiumei, YANG Fuhe, GAO Xiuhua . Effects of Different Copper Sources and Levels on Growth Performance, Nutrient Digestibility and Serum Indices of Growing Blue Foxes[J]. Chinese Journal of Animal Nutrition, 2018 , 30(8) : 3091 -3099 . DOI: 10.3969/j.issn.1006-267x.2018.08.026

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