不同水平的蚯蚓和蚯蚓粪对草鱼肌肉品质的影响

实验在基础饲料中添加不同浓度的蚯蚓(5%、7.5%、10%)和蚯蚓粪(2%、4%、6%),饲养平均体重(54.03±0.15)g的草鱼100 d,研究蚯蚓和蚯蚓粪对草鱼肌肉品质的影响。结果表明:添加蚯蚓和蚯蚓粪可显著提高肌肉中粗蛋白的含量(P<0.05),以添加7.5%～10%蚯蚓和6%蚯蚓粪效果最好,对水分、粗脂肪和粗灰分均无显著影响(P>0.05);在肌肉氨基酸总量方面,除去2%蚯蚓粪组与对照组相比差异不显著外,其余实验组均显著高于对照组,并以添加7.5%蚯蚓实验组氨基酸总量最高;在肌肉必需氨基酸含量方面,7.5%蚯蚓组显著高于对照组,其余各实验组有高于对照组的趋势;在肌肉鲜味氨基酸含量方面,各实验组间差异不显著;氨基酸营养价值评价结果表明,添加适量的蚯蚓和蚯蚓粪均可提高EAAI值,以添加7.5%蚯蚓时EAAI值最高。综上所述,添加一定浓度的蚯蚓和蚯蚓粪有改善草鱼肌肉品质的趋势,以添加7.5%蚯蚓时效果最好。

Effect of different levels of earthworms and vermicompost on the flesh quality of grass carp,ctenopharyngodon idellus

To investigate the effects of earthworms and vermicompost on the flesh quality of grass carp,grass carp with the average body weight(54.03±0.15) g were fed for 100 days by adding 5%,7.5%,10% earthworms or 2%,4%,6% vermicompost in basal diets.The results showed that:adding earthworms and vermicompost could significantly improve the content of crude protein in flesh(P<0.05),adding 7.5%～10% earthworms and 6% vermicompost worked the best while had no significant effects on moisture,crude fat and crude ash(P>0.05);in the aspect of muscle total amino acids content,almost all test groups were better than the control group except the group added with 2%vermicompost with no difference compared with the control group(P>0.05),while the test group added with 7.5% earthworm worked the best;in the aspect of essential amino acids content,the EAA content of adding 7.5% earthworms test group was significantly higher than that of the control group,while the other groups had just a high trend;in the aspect of flavor amino acid concentration in muscle,all the test groups had no difference with the control group;the evaluation results of amino acid nutritional value showed that,diets added with appropriate earthworms and vermicompost can increase EAAI,EAAI was the highest while adding with 7.5% earthworms.In summary,diets added with a certain concentration of earthworms and vermicompost had a trend of improving the flesh quality of grass carp,while adding 7.5% earthworms worked the best.