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苜蓿皂苷促进血鹦鹉鱼对虾青素的吸收及其最适添加水平

DOI: 10.3969/j.issn.1006-267x.2015.08.033

Keywords: 血鹦鹉鱼,苜蓿皂苷,类胡萝卜素,生长,红度值

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Abstract:

本试验旨在探索苜蓿皂苷促进血鹦鹉鱼对虾青素吸收的效果及其最适添加水平。选取平均体重为(10.63±0.30)g的血鹦鹉鱼630尾,随机分为7组(每组3个重复,每个重复30尾):空白对照组投喂基础饲料,虾青素对照组投喂添加300mg/kg虾青素的基础饲料,试验组分别投喂添加300mg/kg的虾青素及800、1200、1600、2000或2400mg/kg苜蓿皂苷的基础饲料,试验期为60d。结果表明:1)在添加300mg/kg虾青素的饲料中添加苜蓿皂苷能提高鱼体的生长指标,苜蓿皂苷添加水平为2000mg/kg时特定生长率达到最高值。2)苜蓿皂苷添加水平达到1200mg/kg后,鳞片、尾鳍和皮肤中类胡萝卜素含量较虾青素对照组和空白对照组显著提高(P<0.05),且在苜蓿皂苷添加水平为2000mg/kg时同时达到最大值。3)在苜蓿皂苷添加水平达到1200mg/kg后,鱼体背部和尾鳍的红度值显著高于虾青素对照组和空白对照组(P<0.05),分别在苜蓿皂苷添加水平为1600和2000mg/kg时达到最大值。由此可知,在含有虾青素的饲料中添加苜蓿皂苷能促进血鹦鹉鱼的生长和对虾青素的吸收;综合特定生长率结果,在添加了300mg/kg虾青素的饲料中苜蓿皂苷的最适添加水平为2000mg/kg。

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