This experiment was conducted to study the effects of dietary copper supplemental level on growth performance, nutrient digestibility and nitrogen metabolism of growing minks. Eighty healthy male minks at the age of (60±3) days were randomly divided into 8 groups with 10 replicates each and 1 mink per replicate. The minks in the 8 groups were fed experimental diets with copper supplemental levels of 0 (group Ⅰ), 4 (group Ⅱ), 8 (group Ⅲ), 16 (group Ⅳ), 32 (group Ⅴ), 64 (group Ⅵ), 128 (group Ⅶ) and 256 mg/kg (group Ⅷ), respectively. The pre-test period lasted for 7 days and the trial period lasted for 60 days. The results showed as follows: the final weight and average daily gain in the group Ⅴ were extremely significantly higher than those in the group Ⅷ (P<0.01), while the feed/gain in the group Ⅴ was extremely significantly lower than that in the group Ⅷ (P<0.01). The average daily feed intake in the group Ⅴ was extremely significantly higher than that in the groups Ⅰ and Ⅶ (P<0.01), and was significantly higher than that in the group Ⅶ (P<0.05). The dry matter (DM) intake in the group Ⅴ was extremely significantly higher than that in the group Ⅷ (P<0.01). The DM digestibility in the group Ⅴ was extremely significantly higher than that in the group Ⅵ (P<0.01), and was significantly higher than that in the groups Ⅱ and Ⅷ (P<0.05). The protein digestibility in the group Ⅴ was extremely significantly higher than that in the group Ⅷ (P<0.01), and was significantly higher than that in the groups Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅵ and Ⅶ (P<0.05). The fat digestibility in the groups Ⅳ and Ⅴ was significantly higher than that in the group Ⅷ (P<0.05). The nitrogen intake in the group Ⅴ was extremely significantly higher than that in the group Ⅷ (P<0.01). The nitrogen deposition in the group Ⅴ was extremely significantly higher than that in the groups Ⅱ, Ⅲ, Ⅵ and Ⅷ (P<0.01), and was significantly higher than that in the groups Ⅰ and Ⅳ (P<0.05). The net protein utilization in the group Ⅴ was significantly higher than that in the groups Ⅱ, Ⅲ, Ⅵ and Ⅷ (P<0.05). The biological value of protein in the group Ⅴ was extremely significantly higher than that in the group Ⅲ (P<0.01), and was significantly higher than that in the groups Ⅰ, Ⅱ, Ⅵ and Ⅷ (P<0.05). In conclusion, when the dietary copper supplemental level arrives at 32 mg/kg (total copper level is 39 mg/kg), the nutrient digestibility, nitrogen deposition, net protein utilization and biological value of protein of growing minks are more ideal, and the growth performance is better.
WU Xuezhuang
,
ZHANG Tietao
,
CUI Hu
,
JIANG Qingkui
,
GAO Xiuhua
,
YANG Fuhe
,
XING Xiumei
. Effects of Dietary Copper Supplemental Level on Growth Performance, Nutrient Digestibility and Nitrogen Metabolism of Growing Minks[J]. Chinese Journal of Animal Nutrition, 2012
, 24(6)
: 1078
-1084
.
DOI: 10.3969/j.issn.1006-267x.2012.06.012
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