This experiment was conducted to study the effects of different dietary vitamin K3 levels on body composition, meat quality and antioxidant capacity of Songpu mirror carp. A total of 525 juvenile Songpu mirror carp with average body weight of (2.58±0.16) g were randomly allocated into 7 groups with 3 replicates per group and 25 fish per replicate. The fish in 7 groups were fed the basal diet (vitamin K1 content was 0.54 mg/kg) supplemented with 0, 5, 10, 20, 40, 80 and 2 000 mg/kg vitamin K3 (menadione nicotinamide bisulfite, MNB), respectively. Under the conditions of water temperature 24 ℃ and dissolved oxygen 7.46 to 8.61 mg/L, the experiment lasted for 60 days. The results showed as follows: different levels of vitamin K3 supplementation could not affect the body composition (moisture, crude protein, ether extract and ash contents) and the hepatopancreas malonyldiadehyde (MDA) content of Songpu mirror carp (P>0.05). The shearing force of Songpu mirror carp in 0 mg/kg group was significantly lower than that in other groups (P<0.05). In 10 mg/kg group, the pH24 h was significantly lower than that in other groups (P<0.05), but the drip loss and superoxide dismutase (SOD) activity in hepatopancreas were significantly higher than those in 0 and 5 mg/kg groups (P<0.05), and the glutathione (GSH) content in hepatopancreas was significantly higher than that in 2 000 mg/kg group (P<0.05); the hepatopancreas total antioxidant capacity (T-AOC) in 10 and 20 mg/kg groups were significantly higher than those in 0, 80 and 2000 mg/kg groups (P<0.05), but no significant difference was found between 10 and 20 mg/kg groups. The linear regression result showed that the requirement for vitamin K3 of Songpu mirror carp which had the highest T-AOC was 16.89 mg/kg diet. In conclusion, adding vitamin K3 in diet can improve the muscle shearing force and reduce the muscle capacity of holding water of Songpu mirror carp. Whether no or excessively adding vitamin K3 can reduce the antioxidant capacity of Songpu mirror carp, and its optimum addition level is 16.89 mg/kg diet.［Chinese Journal of Animal Nutrition, 2011, 23（6）：1058 -1064］
WANG Yang,XU Qiyou,XU Hong,WANG Chang’an,SHI Lianyu
. Effects of Vitamin K3 on Body Composition, Meat Quality and Antioxidant Capacity of Songpu Mirror Carp[J]. Chinese Journal of Animal Nutrition, 2011
, 23(06)
: 1058
-1064
.
DOI: 10.3969/j.issn.1006-267x.2011.06.025
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