Dietary Ratio of n-6/n-3 Polyunsaturated Fatty Acid Affects Growing Performance, Nutrient Digestibility and Nitrogen Metabolism of Male Blue Foxes during Growth Period

ZHONG Wei; LUO Jing; ZHANG Ting; SUN Weili; LIU Hanlu; SUN Xuyang; LI Guangyu

doi:10.3969/j.issn.1006-267x.2016.10.023

2016 , Vol. 28 >Issue 10: 3199 - 3206

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.10.023

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Dietary Ratio of n-6/n-3 Polyunsaturated Fatty Acid Affects Growing Performance, Nutrient Digestibility and Nitrogen Metabolism of Male Blue Foxes during Growth Period

ZHONG Wei ,
LUO Jing ,
ZHANG Ting ,
SUN Weili ,
LIU Hanlu ,
SUN Xuyang ,
LI Guangyu

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State Key Laboratory of Special Economic Animal Molecular Biology, Institute of Special Animal and Plant Science, Chinese Academy of Agriculture Sciences, Changchun 130112, China

Received date: 2016-04-05

Online published: 2016-10-17

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Abstract

The aim of this trial was to investigate the effects of dietary ratio of n-6/n-3 polyunsaturated fatty acid (PUFA) on growing performance, nutrient digestibility and nitrogen metabolism of male blue foxes during growth period. Forty-eight 102-day-old male blue foxes with average body weight of (2 370±24)g were selected and assigned into 4 groups with 12 replicates in each group and 1 blue fox in each replicate. Except the composition and proportion of oil, the other ingredients in diets were the same. Diet of group Ⅰ supplemented with fish oil and soybean oil, n-6/n-3=3.00; diet of group Ⅱ supplemented with fish oil and corn oil, n-6/n-3=6.03; diet of group Ⅲ supplemented with fish oil and corn oil, n-6/n-3=9.01; diet of group Ⅳ supplemented with soybean oil and corn oil, n-6/n-3=18.04. The adjustment period lasted for 7 days, and the experimental period lasted for 46 days. The results showed as follows:1) the body weight of groups Ⅲ and Ⅳ at 125 days of age was significantly higher than that of group Ⅱ (P<0.05), the average daily gain of groups Ⅰ, Ⅲ and Ⅳ at 102 to 125 days of age was significantly higher than that of group Ⅱ (P<0.01), the ratio of feed to gain of groups Ⅰ, Ⅲ and Ⅳ at 102 to 125 days of age was significantly lower than that of group Ⅱ (P<0.05). Dietary ratio of n-6/n-3 PUFA had no effects on growth performance at 126 to 147 days of age (P>0.05). 2) The dry matter intake of groups Ⅰ and Ⅲ was significantly higher than that of group Ⅱ (P<0.05), the dry matter digestibility of groups Ⅰ, Ⅲ and Ⅳ was significantly higher than that of group Ⅱ (P<0.05), the crude protein digestibility of groups Ⅲ and Ⅳ was significantly higher than that of group Ⅱ (P<0.01), the gross energy digestibility of groups Ⅲ and Ⅳ was significantly higher than that of group Ⅱ (P<0.05), the ether extract digestibility of group Ⅲ was significantly higher than that of group Ⅱ (P<0.05). Dietary ratio of n-6/n-3 PUFA had no effects on carbohydrate digestibility (P>0.05). 3) The intake of nitrogen of groups Ⅰ and Ⅲ was significantly higher than that of groups Ⅱ and Ⅳ (P<0.01), the fecal nitrogen content of groups Ⅳ was significantly lower than that of groups Ⅰ and Ⅱ (P<0.05). Dietary ratio of n-6/n-3 PUFA had no effects on urine nitrogen content, retention nitrogen, net protein utilization and biological value of protein (P>0.05). In conclusion, when dietary ratio of n-6/n-3 PUFA is 9.01 or 18.04, the blue fox can get better growth performance, however, considering feed cost and storage stability, the mixture of corn oil and soybean oil is more beneficial.

Key words： n-6/n-3; PUFA; blue fox; growth performance; digestibility; nitrogen metabolism

Cite this article

ZHONG Wei , LUO Jing , ZHANG Ting , SUN Weili , LIU Hanlu , SUN Xuyang , LI Guangyu . Dietary Ratio of n-6/n-3 Polyunsaturated Fatty Acid Affects Growing Performance, Nutrient Digestibility and Nitrogen Metabolism of Male Blue Foxes during Growth Period[J]. Chinese Journal of Animal Nutrition, 2016 , 28(10) : 3199 -3206 . DOI: 10.3969/j.issn.1006-267x.2016.10.023

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