Effects of Dietary Tryptophan Supplemental Level on Growth Performance, Nitrogen Metabolism, Nutrient Digestibility, Fur Quality and Serum Parameters of White Minks during Winter Fur-Growing Period

ZHANG Xuelei, CUI Hu, HUANG Shengguang, XU Yi, NIE Hao, LI Guangyu, WANG Feng, ZHANG Tietao

doi:10.3969/j.issn.1006-267x.2018.01.019

2018 , Vol. 30 >Issue 1: 147 - 155

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.01.019

Molecular Nutrition

Effects of Dietary Tryptophan Supplemental Level on Growth Performance, Nitrogen Metabolism, Nutrient Digestibility, Fur Quality and Serum Parameters of White Minks during Winter Fur-Growing Period

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1. Institute of Economic Animal and Plant Science, Chinese Academy of Agriculture Sciences, Changchun 130112, China;
2. Institute of Feed Research, Chinese Academy of Agriculture Sciences, Beijing 100081, China

Received date: 2017-08-08

Online published: 2018-01-04

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Abstract

This study was conducted to study the effects of dietary tryptophan (Trp) supplemental level on growth performance, nitrogen metabolism, nutrient digestibility, fur quality and serum parameters of white minks during winter fur-growing period. Sixty (120±5)-day-old healthy male white minks were randomly divided into 6 groups with 10 replicates per group and 1 mink per replicate. Minks in the negative control group (group Ⅰ) were fed a basal diet (crude protein level was 34% and Trp level was 0.26%), minks in the experimental groups were fed the basal diets supplemented with 0.1% (group Ⅱ), 0.3% (group Ⅲ), 0.5% (group Ⅳ) and 0.7% Trp (group Ⅴ), respectively, and minks in the positive control group (group Ⅵ) were fed a basal diet (crude protein level was 36% and Trp level was 0.27%). The pretest period lasted for 5 days and the trial lasted for 70 days. The results showed as follows:1) there were no significant differences in the average daily gain, average daily feed intake, dry matter digestibility, crude protein digestibility, ether extract digestibility and nitrogen deposition of white minks among all groups (P>0.05), there were no significant differences in the fur quality score of white minks among all groups (P>0.05), there were no significant differences in the glutamic-oxalacetic transaminase activity and insulin like growth factor-Ⅰ content in serum of white minks among all groups (P>0.05). 2) The serum total cholesterol content of white minks in group Ⅴ was significantly higher than that in groups Ⅱ, Ⅲ, Ⅳ and Ⅵ (P<0.05); the serum immunoglobulin M content of white minks in groups Ⅳ and Ⅴ was significantly higher than that in group Ⅱ (P<0.05); the serum immunoglobulin A content of white minks in groups Ⅳ and Ⅴ was significantly higher than that in groups Ⅱ, Ⅲ and Ⅵ (P<0.05), and the serum immunoglobulin A content of white minks in groups Ⅳ was significantly higher than that in group Ⅰ (P<0.05); the serum immunoglobulin G content of white minks in groups Ⅳ was significantly lower than that in groups Ⅰ, Ⅱ,Ⅲ and Ⅳ (P<0.05). In conclusion, diet with 0.26% Trp level and 34% crude protein level can satisfy the Trp nutrient basal requirement of white minks during winter fur-growing period, and has ideal growth performance.

Key words： winter fur-growing period; white minks; tryptophan; growth performance; serum biochemical parameters

Cite this article

ZHANG Xuelei, CUI Hu, HUANG Shengguang, XU Yi, NIE Hao, LI Guangyu, WANG Feng, ZHANG Tietao . Effects of Dietary Tryptophan Supplemental Level on Growth Performance, Nitrogen Metabolism, Nutrient Digestibility, Fur Quality and Serum Parameters of White Minks during Winter Fur-Growing Period[J]. Chinese Journal of Animal Nutrition, 2018 , 30(1) : 147 -155 . DOI: 10.3969/j.issn.1006-267x.2018.01.019

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