Molecular Nutrition

Effects of Dietary Vitamin B2 Supplemental Level on Growth Performance, Fur Quality, Nutrient Digestibility and Nitrogen Metabolism of Minks during Winter Fur-Growing Period

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

Received date: 2018-06-13

  Online published: 2019-01-16

Abstract

This experiment was conducted to evaluate the effects of dietary vitamin B2 supplemental level on growth performance, fur quality, nutrient digestibility and nitrogen metabolism of minks during winter fur-growing period. Ninety healthy short black male minks at (135±5) days of age with an similar body weight were randomly divided into 6 groups with 15 replicates per group and 1 mink per replicate. Minks in the 6 groups were fed the basal diets supplemented with 0 (group Ⅰ, control group), 2.5 (group Ⅱ)、5.0 (group Ⅲ), 10.0 (group Ⅳ), 20.0 (group Ⅴ) and 40.0 mg/kg (group Ⅵ) vitamin B2, respectively. The adaptation period lasted for 5 days and the formal period lasted for 63 days. The results showed as follows:1) dietary vitamin B2 supplemental level had no significant effects on the final weight, average daily gain and average daily feed intake of minks (P>0.05). The feed to gain ratio of minks of groups Ⅴ and Ⅵ was significantly lower than that of the control group (P<0.01), and had no significant difference compared with groups Ⅱ, Ⅲ and Ⅳ (P>0.05). 2) Dietary vitamin B2 supplemental level had no significant effects on the fur quality score and body length of minks (P>0.05). The underwear length of minks of group Ⅴ was significantly higher than that of other groups (P<0.01), and the guard length of minks of groups Ⅳ and Ⅴ was significantly lower than that of groups Ⅰ, Ⅱ, Ⅲ and Ⅵ (P<0.01). 3) Dietary vitamin B2 supplemental level had no significant effects on the dry matter digestibility, protein digestibility and fat digestibility of minks(P>0.05). 4) Dietary vitamin B2 supplemental level had no significant effects on the nitrogen intake, urine nitrogen, fecal nitrogen and nitrogen deposition of minks (P>0.05). The net protein utilization of minks of group Ⅴ was significantly higher than that of the control group (P<0.05), and the biological value of protein of minks of groups Ⅴ and Ⅵ was significantly higher than that of groups Ⅰ, Ⅱ and Ⅲ (P<0.05). Considering all indices, considered the perspective of improving growth performance and reducing feed costs, the optimal dietary vitamin B2 supplemental level is 2.5 mg/kg (dietary vitamin B2 actual content is 5.49 mg/kg).

Cite this article

MU Linlin, ZHONG Wei, CHEN Shuangshuang, NAN Weixiao, WANG Jing, LI Rende, ZHANG Ting, ZHANG Yufei, LI Guangyu . Effects of Dietary Vitamin B2 Supplemental Level on Growth Performance, Fur Quality, Nutrient Digestibility and Nitrogen Metabolism of Minks during Winter Fur-Growing Period[J]. Chinese Journal of Animal Nutrition, 2019 , 31(1) : 251 -257 . DOI: 10.3969/j.issn.1006-267x.2019.01.031

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