不同硒源对刺参呼吸代谢的影响

为了研究不同硒源对刺参Apostichopus japonicus特定生长率和呼吸代谢指标的影响,以刺参幼参和成参为研究对象,分别强化投喂硒添加量为0.6 mg/kg的硒代蛋氨酸、硒酸钠和亚硒酸钠饲料,试验周期为60 d。结果表明:硒添加组成参和幼参的特定生长率均显著大于对照组(P0.05),其中硒代蛋氨酸组最大,且显著大于硒酸钠组和亚硒酸钠组(P0.05),除硒代蛋氨酸组外,其他各试验组成参的特定生长率均大于幼参;硒添加组成参和幼参的耗氧率均显著大于对照组(P0.05),其中硒代蛋氨酸组最小,显著小于硒酸钠组和亚硒酸钠组(P0.05),对应组中,幼参耗氧率大于成参;硒添加组成参和幼参的排氨率均低于对照组,除硒代蛋氨酸组成参显著低于对照组(P0.05)外,其余硒添加组与对照组均无显著性差异(P0.05),硒代蛋氨酸组的排氨率最小,对应组中,幼参排氨率大于成参;硒添加组成参和幼参的O/N值均显著大于对照组(P0.05),其中硒代蛋氨酸组最小,但硒添加组间无显著性差异(P0.05),对应组中,成参的O/N值大于幼参。研究表明,饲料中添加硒能够提高刺参的代谢率,促进刺参生长,其中有机硒(硒代蛋氨酸硒)的促生长效果好于无机硒(硒酸钠和亚硒酸钠),且硒代蛋氨酸对幼参的促生长效果要好于成参。

Effects of dietary selenium sources on respiratory metabolism of sea cucumber Apostichopus japonicus

Juvenile and adult sea cucumber Apostichopus japonicus were fed the diets supplemented with seleniume-thionine, sodium selenate and sodium selenite at a rate of 0. 6 mg/kg for 60 days to study the effect of different se-lenium sources on sea cucumber specific growth rate and respiratory metabolism index. The results showed that all the sea cucumber fed the diets supplemented with selenium had significantly higher specific growth rate than the an-imals in the control group did, the maximal specific growth rate in the selenomethionine group,significantly higher than in the sodium selenate group and sodium selenite group(P<0. 05). There was higher specific growth rate in the adults than that in the juveniles except for the selenomethionine group. All the sea cucumber fed the diets sup-plemented with selenium had significantly higher oxygen consumption rate than the animals in the control(P<0. 05) did, the minimal oxygen consumption rate in selenomethionine group, significantlty lower than sodium selenate and sodium selenite groups(P<0. 05), and the juvenilese higher than the adults. There was lower ammonia excretion rate in the sea cucumber fed the diets supplemented with selenium than in the control, the minimal in selenomethi-onine group, and significantly lower than in the control(P<0. 05),without significant difference among sodium sel-enate group, sodium selenite group and the control(P>0. 05). The juveniles had higher ammonia excretion rate than the adults did. There was significantly higher O/N value in the sea cucumber fed the diets supplemented with selenium than in the test group (P<0. 05), the minimal O/N in selenomethionine group, without significant differ-ence among all the treated groups(P>0. 05),and he juveniles higher than the adults. The findings suggested that addition of selenium improved metabolic rate and growth, with the organic selenium ( selenomethionine) being bet-ter than the inorganic selenium ( sodium selenate, and sodium selenite) and juveniles being better than the adults in the selenomethionine group.