Effects of Dietary Tryptophan Supplemental Level on Growth Performance, Nitrogen Metabolism and Amino Acid Digestibility of White Minks during Growing Period

ZHANG Xuelei, CUI Hu, WANG Jing, LI Guangyu, WANG Feng, ZHANG Tietao

doi:10.3969/j.issn.1006-267x.2017.11.047

2017 , Vol. 29 >Issue 11: 4227 - 4235

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.11.047

Molecular Nutrition

Effects of Dietary Tryptophan Supplemental Level on Growth Performance, Nitrogen Metabolism and Amino Acid Digestibility of White Minks during 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: 2017-05-02

Online published: 2017-10-31

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Abstract

This study was conducted to study the effects of dietary tryptophan (Trp) supplemental level on growth performance, nitrogen metabolism and amino acid digestibility of white minks during growing period. Sixty healthy male white minks at the age of 60 days with similar body weight[(0.83±0.09) kg] 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%, Trp level was 0.22%), minks in the experimental groups were fed the basal diets supplemented with 0.1% (group Ⅱ), 0.3% (group Ⅲ), 0.5% (group Ⅳ), 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%, Trp level was 0.22%). The pretest period lasted for 7 days and the trial lasted for 60 days. The results showed as follows:1) the average daily gain and average daily feed intake of minks during 60 to 120 days of age had no significant difference among all groups (P>0.05), the average daily gain of groups Ⅲ, Ⅳ, Ⅵ was higher than that of other groups. 2) The dry matter digestibility of group Ⅰ was significantly higher than that of groups Ⅱ, Ⅲ, Ⅳ and Ⅵ (P<0.05). The ether extract digestibility of groups Ⅴ and Ⅵ was significantly higher than that of group Ⅳ (P<0.05). The urine nitrogen of groups Ⅳ, Ⅴ and Ⅵ was significantly higher than that of group Ⅲ (P<0.05). The nitrogen deposition of groups Ⅰ and Ⅲ was significantly higher than that of group Ⅳ (P<0.05). The net protein utilization and biological value of protein of group Ⅲ was significantly higher than that of groups Ⅳ, Ⅴ and Ⅵ (P<0.05). 3) The digestibilities of glutamate, phenylalanine, lysine and proline of group Ⅰ were significantly higher than those of group Ⅲ (P<0.05). The isoleucine digestibility of groups Ⅰ and Ⅵ was significantly higher than that of group Ⅲ (P<0.05). The leucine digestibility of groups Ⅰ and Ⅵ was significantly higher than that of group Ⅲ (P<0.05). The alanine digestibility of group Ⅴ was significantly higher than that of group Ⅲ (P<0.05). The methionine digestibility of group Ⅵ was significantly higher than that of other groups (P<0.05), and the methionine digestibility of groups Ⅰ, Ⅳ and Ⅴ was significantly higher than that of groups Ⅱ and Ⅲ (P<0.05). The tyrosine digestibility of groups Ⅰ, Ⅴ and Ⅵ was significantly higher than that of groups Ⅲ and Ⅳ (P<0.05). The cysteine digestibility of groups Ⅰ, Ⅴ and Ⅵ was significantly higher than that of groups Ⅳ (P<0.05). The histidine digestibility of group Ⅴ was significantly higher than that of groups Ⅱ and Ⅲ (P<0.05). The Trp digestibility of groups Ⅰ, Ⅲ and Ⅵ was significantly higher than that of group Ⅱ (P<0.05). The arginine digestibility of groups Ⅰ,Ⅴ and Ⅵ was significantly higher than that of groups Ⅱ and Ⅲ (P<0.05). The total amino acid digestibility of group Ⅰ was significantly higher than that of group Ⅲ (P<0.05). In conclusion, comprehensive considers the growth performance, nitrogen metabolism and amino acid digestibility indices, when dietary crude protein level is 34%, the dietary suitable Trp supplemental level for minks is 0.3% (dietary Trp level is 0.52%).

Key words： growing period; minks; tryptophan; growth performance; nitrogen metabolism; amino acid digestibility

Cite this article

ZHANG Xuelei, CUI Hu, WANG Jing, LI Guangyu, WANG Feng, ZHANG Tietao . Effects of Dietary Tryptophan Supplemental Level on Growth Performance, Nitrogen Metabolism and Amino Acid Digestibility of White Minks during Growing Period[J]. Chinese Journal of Animal Nutrition, 2017 , 29(11) : 4227 -4235 . DOI: 10.3969/j.issn.1006-267x.2017.11.047

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