分别在基础饲料(对照组)中添加100 mg/kg的虾青素、角黄素，混合色素(50 mg/kg虾青素+50 mg/kg角黄素)饲喂初始体重为(56.60±0.63) g的虹鳟60 d，考察虾青素和角黄素对虹鳟肌肉着色和肝脏总抗氧化能力的影响。结果显示，饲料中添加了虾青素、角黄素和混合色素后对虹鳟增重率、饲料系数及肌肉常规成分、肌肉失水率、含肉率均无显著影响(P> 0.05)。虾青素组、角黄素组和混合色素组虹鳟肌肉的比色卡得分、红度、虾青素含量和血清总类胡萝卜素含量均比对照组有显著提高(P< 0.05)；虾青素组虹鳟肌肉比色卡得分(26.25)和红度值(18.40)显著高于角黄素组(22.38, 14.13)和混合色素组(24.00, 15.70)(P< 0.05)；虾青素组虹鳟肌肉虾青素含量为4.75 mg/kg (30 d)和6.45 mg/kg (60 d)，均显著高于混合色素组的3.87 mg/kg (30 d)和5.48 mg/kg (60 d)(P< 0.05)；在虹鳟血清总类胡萝卜素含量方面，虾青素组 > 混合色素组 > 角黄素组；虾青素组、角黄素组、混合色素组虹鳟肝脏的总抗氧化能力之间无显著差异(P> 0.05)，分别为2.39 U/mg，2.25 U/mg，2.39 U/mg，均较对照组(2.03 U/mg)显著提高(P< 0.05)。上述结果表明：饲料中添加100 mg/kg虾青素、角黄素及虾青素+角黄素混合(1∶1)均能有效改善虹鳟肌肉颜色，提高肝脏总抗氧化能力，虾青素、虾青素+角黄素混合(1∶1)对虹鳟肌肉的着色效果优于角黄素。

The aim of this study was to assess the effects of adding astaxanthin(100 mg/kg)， canthaxanthin(100 mg/kg) and mixed pigment(50 mg/kg astaxanthin+50 mg/kg canthaxanthin) on muscle pigmentation and total antioxidant capacity of liver in rainbow trout with an initial weight of (56.60±0.63) g. After 60 days feeding, results showed that there were no significant differences of weight gain, feed conversion ratio, muscle proximate composition component , water loss rate and muscle percentage of rainbow trout among groups(P> 0.05). The Salmo Fan score, redness, astaxanthin content of muscle, and carotenoids content of serum in rainbow trout fed diets supplemented with pigments, were higher than that of control group(P< 0.05). SalmoFan score and redness of rainbow trout of astaxanthin group were 26.25 and 18.40, higher than the canthaxanthin group(22.38，14.13) and the mixed pigment group(24.00, 15.70)(P< 0.05). The muscle astaxanthin content of astaxanthin group was 4.75 mg/kg on 30th day and 6.45 mg/kg on 60th day, and both were higher than that of mixed pigment group(3.87 mg/kg, 5.48 mg/kg)(P< 0.05). Fish of astaxanthin group had the highest serum carotenoids content, higher than that of mixed pigment group, the canthaxanthin group. There was no significant difference in total antioxidant capacity of liver among the three pigmentsupplemented groups(2.39 U/mg, 2.26 U/mg, 2.39 U/mg), which was higher than that of control group(2.03 U/mg)(P< 0.05). Results above showed that adding 100 mg/kg astaxanthin, canthaxanthin or mixed pigment(50 mg/kg astaxanthin+50 mg/kg canthaxanthin) in feed could improve the muscle colour and total antioxidant capacity of rainbow trout. Astaxanthin, mixed pigment(50 mg/kg astaxanthin+50 mg/kg canthaxanthin) had better pigmentation than canthaxanthin, and was suggested to be apply in rainbow trout culture.

上海市重点学科建设项目（Y1101）