Effects of Dietary Copper Sources and Levels on Growth Performance, Nutrient Apparent Digestibility and Copper and Nitrogen Metabolism of Male Minks in Late Growing Period

WU Xuezhuang, GAO Xiuhua, YANG Fuhe, ZHANG Tietao, CUI Hu, LIU Zhi, GUO Jungang, XING Xiumei

doi:10.3969/j.issn.1006-267x.2015.03.017

2015 , Vol. 27 >Issue 3: 795 - 803

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.03.017

Special Economic Animal Nutrition

Effects of Dietary Copper Sources and Levels on Growth Performance, Nutrient Apparent Digestibility and Copper and Nitrogen Metabolism of Male Minks in Late Growing Period

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1. Institute of Feed Research, Chinese Academy of Agriculture Science, Beijing 100081, China;
2. State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Economic Animal and Plant Science, Chinese Academy of Agriculture Science, Changchun 130112, China

Received date: 2014-09-02

Online published: 2015-03-18

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Abstract

This experiment was conducted to study the effects of dietary copper sources and levels on growth performance, nutrient apparent digestibility and copper and nitrogen metabolism of male minks in late growing period. The experiment was used in a 3×3+1 factorial experiment based on a completely randomized design, minks in the control group were fed a basal diet, and minks in other nine groups were fed the basal diets supplemented with 3 sources (copper sulfate, tribasic copper chloride and copper methionine) and 3 levels (10, 25, and 40 mg/kg). The pre-test period lasted for 7 days, and the trial lasted for 45 days. The results showed as follows: 1) the average daily feed intake of minks was significantly linear increased with dietary copper supplemental level increased (P<0.01), and average daily gain of minks was linear increased with dietary copper supplemental level increased (P=0.053). 2) The apparent digestibility of ether extract and crude protein of minks was significant linear increased with dietary copper supplemental level increased (P<0.01 or P<0.05). 3) The copper intake, fecal copper excretion, Urinary copper excretion and copper retention of minks were significant linear increased with dietary copper supplemental level increased (P<0.01), but the copper apparent absorption was significant linear decreased with dietary copper supplemental level increased (P<0.01). The tribasic copper chloride and copper methionine apparent absorption of minks was significantly higher than copper sulfate apparent absorption (P<0.05). The nitrogen retention was significant linear increased with dietary copper supplemental level increased (P<0.05). In conclusion, when copper content is 8.05 mg/kg in the basal diet, dietary supplemented with 40 mg/kg copper can improve growth performance of minks in late growing period, and improve the ether extract apparent digestibility. Tribasic copper chloride and copper methionate apparent absorption of minks is higher than copper sulfate apparent absorption.

Key words： minks; copper methionate; tribasic copper chloride; copper sulfate; growth performance; nutrient apparent digestibility

Cite this article

WU Xuezhuang, GAO Xiuhua, YANG Fuhe, ZHANG Tietao, CUI Hu, LIU Zhi, GUO Jungang, XING Xiumei . Effects of Dietary Copper Sources and Levels on Growth Performance, Nutrient Apparent Digestibility and Copper and Nitrogen Metabolism of Male Minks in Late Growing Period[J]. Chinese Journal of Animal Nutrition, 2015 , 27(3) : 795 -803 . DOI: 10.3969/j.issn.1006-267x.2015.03.017

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