The experiment was conducted to study the effects of dietary protein levels on serum nitrogen heterocyclic compounds, nitrogen metabolism and antioxidant capacity of minks during the winter hair period. Sixty healthy 90-day-old male minks were randomly divided into 6 groups with 10 replicates per group and 1 mink per replicate. The minks were fed the experimental diets with 28% (group Ⅰ), 30% (group Ⅱ), 32% (group Ⅲ), 34% (group Ⅳ), 36% (group Ⅴ) and 38% (group Ⅵ) protein levels, respectively. The trial lasted for 97 d with 7 d of pretrial, and then the minks were slaughtered. The serum was centrifuged and the relative biochemical indices were determined. The results showed as follows: the contents of serum total protein, albumin and globulin in group Ⅲ were significantly higher than those in other groups (P<0.05 or P<0.01), and no significant difference was found among other groups (P>0.05); serum total amino acid content in group Ⅳ was significantly higher than that in groups Ⅰ, Ⅱ and Ⅲ (P<0.01); serum urea nitrogen content in group Ⅲ was significantly higher than that in groups Ⅱ, Ⅳ and Ⅴ (P<0.05); serum glutamic oxaloacetic transaminase activity in group Ⅴ was significantly higher than that in groups Ⅱ and Ⅵ (P<0.05), but no significant difference was found between group Ⅴ and other groups (P>0.05); serum glutamic pyruvic transaminase activity in group Ⅳ was significantly higher than that in group Ⅲ (P<0.05); serum malondialdehyde content had no significant difference among all groups (P>0.05); serum superoxide dismutase activity in groups Ⅳ, Ⅴ, and Ⅵ was significantly higher than that in groups Ⅱ and Ⅲ (P<0.05 or P<0.01); the highest serum glutathione peroxidase activity was found in group Ⅳ which was significantly higher than that in group Ⅵ (P<0.05), but no significant difference was found between group Ⅳ and other groups (P>0.05). In conclusion, when the dietary protein level come up to 34%, the minks in winter hair period have the relatively higher protein synthesis rate and antioxidant capacity.［Chinese Journal of Animal Nutrition, 2011, 23（6）：1052 -1057］
ZHANG Tietao,ZHANG Zhiqiang,LIU Huitao,GAO Xiuhua,YANG Fuhe,XING Xiumei
. Effects of Dietary Protein Levels on Selected Serum Biochemical Indices of Minks during the Winter Hair Period[J]. Chinese Journal of Animal Nutrition, 2011
, 23(06)
: 1052
-1057
.
DOI: 10.3969/j.issn.1006-267x.2011.06.024
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