嗜酸乳杆菌对大菱鲆生长促进作用的研究

Study on the effect of Lactobacillus acidophilus on promoting growth of turbot Scophthalmus maximus( Linnaeus)

研究了在饲料中添加嗜酸乳杆菌(Lactobacillus acidophilus)对大菱鲆生长的影响。嗜酸乳杆菌为从健康大菱鲆肠道中分离、培养的同源嗜酸乳杆菌,活菌数2.0×109CFU/g,其在饵料中的添加量分别为0‰(对照组)、5‰、10‰和15‰,连续投喂20 d、40 d、60 d后,结果表明,5‰添加组的饲料系数分别降低8.8%、4.4%、1.5%,蛋白质效率分别提高2.7%、3.5%、2.0%;10‰添加组的饲料系数分别降低3.0%、1.5%、-7.2%,蛋白质效率分别提高3.7%、1.1%、-6.0%;15‰组促生长指标均低于对照组。研究表明,在投喂早期,添加5‰嗜酸乳杆菌的饵料对大菱鲆生长的促进效果较好,但随着添加时间的延长,该作用逐渐减弱,并最终低于对照组。

This paper studied the effect of Lactobacillus acidophilus preparations on turbot growth. L. acidophilus was isolated from the healthy turbot intestinal tract and cultured homologous L. acidophilus, which viable count 2.0 X 109 CFU/g. The addition amount of bait was 0%o, 5%o, 10%o and 15%v. After 20 d, 40 d and 60 d continuous feeding, compared with the control group, 5 %o group decreased feed conversion ratio of 8.8%, 4. 4%, 1.5%, protein efficiency of 2.7%, 3.5%, 2.0% ; 10%o group feed conversion ratio decreased by 3.0%, 1.5%, -7.2%, protein efficiency of 3.7%, 1.1%, -6.0% ; 15%o group promoting growth were lower than the control group. These results showed that：only the diet which contained 5 %v L. acidophilus promoted growth of turbot, and it was just in early experimental stage. With the extension of L. acidophilus diet feeding, the promoted growth effects weakened gradually and lower than the control group eventually.