饲料中添加高剂量有机硒和无机硒对异育银鲫生长性能、组织硒蓄积和血液生化指标的影响

为探究饲料中高剂量的有机硒和无机硒对异育银鲫(Carassius auratus gibelio var. CAS V)的生长性能、硒蓄积和血浆生化指标等方面的影响,以硒代蛋氨酸(有机硒)和亚硒酸钠(无机硒)作为不同类型的硒源,初始体重为(62.95±0.23) g异育银鲫为研究对象,进行了为期90d的养殖实验。实验结果表明,饲料中添加0、10和20 mg/kg的有机硒和无机硒对异育银鲫的存活和饲料干物质的表观消化率无显著影响;有机硒处理组硒的表观消化率随饲料有机硒的添加量增加而显著升高(P<0.05);饲料中添加无机硒对硒消化率无显影响(P>0.05)。在饲料中添加有机硒可以提高异育银鲫的生长(P<0.05),在20 mg/kg处理组中达到最高(P<0.05);而饲料中添加10 mg/kg无机硒处理组未显著改变异育银鲫的特定生长率(P>0.05),但高浓度的无机硒则显著降低了其特定生长率(P<0.05)。饲料中添加有机硒显著降低了异育银鲫的肝体比,添加10 mg/kg无机硒显著降低异育银鲫的肝体比(P<0.05);饲料中添加有机硒和无机硒对异...

HIGH DIETARY DOSES OF ORGANIC AND INORGANIC SELENIUM ON GROWTH PERFORMANCE,TISSUE SELENIUM ACCUMULATION AND BLOOD BIOCHEMICAL PARAMETERS OF GIBEL CARP (CARASSIUS AURATUS GIBELIO VAR. CAS V)

To investigate the effects of high doses of organic and inorganic selenium in feed on the growth performance, selenium accumulation and plasma biochemical parameters of gibel carp, organic selenium and inorganic selenium were used as different types of selenium sources, and gibel carp with an initial body weight of (62.95±0.23) g was used for a 90d feeding experiment. The results indicated that the addition of 0, 10 and 20 mg/kg organic and inorganic selenium to the feed did not have a significant effect on the survival rate and the digestibility of the dry matter. Moreover, the addition of organic selenium significantly increased the selenium digestibility of the organic selenium treatment group (P<0.05), while the addition of inorganic selenium to the feed had no significant effect on the selenium digestibility (P>0.05). The addition of organic selenium to the feed increased the growth of gibel carp (P<0.05), reaching the highest level in the 20 mg/kg treatment group (P<0.05). The addition of inorganic selenium to the feed significantly reduced the specific growth rate of the gibel carp (P<0.05), and there was no significant difference in the specific growth rate between the 10 mg/kg inorganic selenium treatment group and the control group (P>0.05). The addition of organic selenium to the feed had no any significant effect on the hepatosomatic index of gibel carp, while the addition of 10 mg/kg inorganic selenium significantly reduced the hepatosomatic index (P<0.05). The addition of organic and inorganic selenium to the feed had no any significant effect on the renosomatic index of gibel carp. The addition of both organic and inorganic selenium significantly increased the selenium content of whole fish, liver, kidney, muscle, bone and gonads, and the organic selenium addition group had significantly higher selenium content in bone, muscle, gonads and whole fish than the inorganic selenium addition group (P<0.05). The addition of organic selenium and inorganic selenium to the diet significantly increased the plasma glucose content, decreased the total plasma bilirubin content and reduced the activity of glutamate and ghrelin (P<0.05), and the addition of 20 mg/kg organic selenium and 10 mg/kg inorganic selenium to the diet significantly reduced the plasma iron ion content (P<0.05). The results showed that the high levels of organic and inorganic selenium in the feed were well tolerated by the gibel carp and the high levels of organic selenium in the feed had no toxic effect on the gibel carp after 90d of the feeding. High levels of dietary organic selenium boosted growth performance and selenium bioaccumulation of gibel carp.