Effects of Methionine Supplementation in Low-Protein Diets on Performance, Nutrient Digestibility and Nitrogen Metabolism of Blue Foxes during the Winter Hair Period

GUO Jungang; ZHANG Tietao; CUI Hu; GAO Xiuhua; YANG Fuhe; XING Xiumei

doi:10.3969/j.issn.1006-267x.2014.04.019

2014 , Vol. 26 >Issue 4: 996 - 1003

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.04.019

Special Economic Animal Nutrition

Effects of Methionine Supplementation in Low-Protein Diets on Performance, Nutrient Digestibility and Nitrogen Metabolism of Blue Foxes during the Winter Hair Period

GUO Jungang ,
ZHANG Tietao ,
CUI Hu ,
GAO Xiuhua ,
YANG Fuhe ,
XING Xiumei

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1. Institute of Feed Research, Chinese Academy of Agriculture Sciences, Beijing 100081, China;
2. State Key Laboratory of Special Economic Animal Molecular Biology, Institute of Special Animal and Plant Science, Chinese Academy of Agriculture Sciences, Changchun 130112, China;
3. Beijing Centre Biology Co., Ltd., Beijing 102206, China

Received date: 2013-11-11

Online published: 2014-04-01

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Abstract

This experiment was conducted to study the effects of methionine supplementation in low-protein diets on performance, nutrient digestibility and nitrogen metabolism of blue foxes during the winter hair period. One hundred and five healthy male blue foxes at the age of 25 weeks with an average body weight of (4.88±0.60) kg were randomly assigned into 7 groups with 15 replicates per group and 1 fox per replicate. The blue foxes in positive control group were fed a 28% protein level basal diet, and those in negative control group were fed a 26% protein level basal diet. The blue foxes in experimental groups were fed low-protein diets (26% protein level basal diets) supplemented with 0.2%, 0.4%, 0.6%, 0.8% and 1.0% methionine, respectively. The pre-test lasted for 7 days and the formal test lasted for 80 days. The results showed as follows: the final body weight, average daily gain and feed conversion rate in 0.6% methionine group were extremely significantly higher than those in negative control group and 0.2% methionine group (P<0.01), and the feed conversion rate was significantly higher than that in 0.4%, 0.8% and 1.0% methionine groups and positive control group (P<0.05). The length of dry fur in 0.6% methionine group was not significantly different compared with positive control group (P>0.05), but significantly longer than that in 0.2%, 0.4% and 0.8% methionine groups and positive control group (P<0.05). The digestibility of dry matter, crude protein and ether extract in 0.6% methionine group was not significantly different compared with positive control group (P>0.05), but significantly or extremely significantly higher than that in negative control group (P<0.05 or P<0.01); the digestibility of cysteine and methionine in 1.0% methionine group was significantly or extremely significantly higher than that in other groups (P<0.05 or P<0.01). The nitrogen deposition in 0.6% methionine group was not significantly different compared with positive control group (P>0.05), but extremely significantly higher than that in 0.2%, 0.4% and 1.0% methionine groups and negative control group (P<0.01); the net protein utilization and protein biological value in 0.6% methionine group were not significantly different compared with positive control group (P>0.05), but significantly higher than those in 1.0% methionine group and negative control group (P<0.05). In conclusion, considering all measured indices of this experiment, when 0.6% methionine is supplemented in the low-protein diet with 26% protein level, that is, when the dietary methionine level is 0.99%, methionine requirement of blue foxes during the winter hair period can be met. In this case, the blue foxes have the optimum growth performance, nutrient digestibility, nitrogen deposition and relevant fur parameters.

Key words： methionine; blue fox; winter hair period; performance; nutrient digestibility; nitrogen metabolism

Cite this article

GUO Jungang , ZHANG Tietao , CUI Hu , GAO Xiuhua , YANG Fuhe , XING Xiumei . Effects of Methionine Supplementation in Low-Protein Diets on Performance, Nutrient Digestibility and Nitrogen Metabolism of Blue Foxes during the Winter Hair Period[J]. Chinese Journal of Animal Nutrition, 2014 , 26(4) : 996 -1003 . DOI: 10.3969/j.issn.1006-267x.2014.04.019

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