饲料中添加不同形式叶黄素对杂交鲶体色的影响

Effect of different forms of xanthophylls on body color of hybrid catfish(Silurus meridionalis Chen×Silurus asotus Linnaeus)

通过在饲料中添加4种不同形式叶黄素考察其对杂交鲶(Silurus meridionalisChen×Silurus asotusLinnaeus)体色的影响。实验共分5个处理组,分别为基础饲料组(对照组)、添加普通叶黄素(以黄体素为主)200 mg/kg组、转化叶黄素(以玉米黄质为主)200 mg/kg组、包被普通叶黄素100 mg/kg组、包被转化叶黄素100 mg/kg组。以上述5种饲料分别饲喂平均体重为61 g的杂交鲶20 d。结果表明,各组生长指标无显著差异;各叶黄素添加组鱼体背部皮肤、腹部皮肤黄度值及皮肤、肌肉叶黄素含量均显著高于对照组(P<0.05),普通叶黄素组背部皮肤、腹部皮肤叶黄素含量较转化叶黄素组显著提高20.3%、11.3%(P<0.05);添加100 mg/kg包被普通叶黄素对杂交鲶的着色效果与200 mg/kg普通叶黄素几乎相当;添加100 mg/kg包被转化叶黄素对杂交鲶的着色效果不及200 mg/kg转化叶黄素。上述研究表明,普通叶黄素对杂交鲶的着色效果优于转化叶黄素;普通叶黄素经包被处理后,在饲料中的添加量降低50%便能达到相同的着色效果。

The objective of this study was to investigate the effect of four different forms of xanthophylls added in feeds on body color of hybrid catfish（Silurus meridionalis Chen×Silurus asotus Linnaeus）.Five diets were prepared in the study,i.e.basal diet（control）,basal diet supplemented with 200 mg/kg normal xanthophylls,200 mg/kg transformed xanthophylls,100 mg/kg coated-normal xanthophylls and 100 mg/kg coated-transformed xanthophylls,and fed to hybrid catfish for 20 days.The results indicated no significant differences in growth among treatments but the value of yellowness of the dorsal,ventral skin and xanthophylls content in skin,muscle of fish fed different xanthophylls were significantly higher than those of control（P0.05）.The content of xanthophylls in dorsal and ventral skin of normal xanthophylls group were increased by 20.3 %,11.3 % compared with transformed xanthophylls group（P0.05）.Pigmentation effect of 100 mg/kg coated-normal xanthophylls was similar to 200 mg/kg normal xanthophylls whereas 100 mg/kg coated-transformed xanthophylls was worse than 200 mg/kg transformed xanthophylls.We conclude that better pigmentation was obtained by adding normal xanthophylls than transformed xanthophylls and when the adding dose of coated-normal xanthophylls was half of normal xanthophylls,the pigmentation effect of former was same as the latter.