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Efficacy of crystalline methionine and microencapsulation methionine in diets for Pacific white shrimp Litopenaeus vannamei
Aquaculture Research ( IF 2 ) Pub Date : 2020-07-30 , DOI: 10.1111/are.14762
Jingping Guo 1 , Wanyou Zhou 2 , Shasha Liu 2 , Wenbing Zhang 1 , Kangsen Mai 1
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An 8‐week growth trial was conducted to evaluate the efficacy of crystalline methionine (C‐Met) or microencapsulated methionine (M‐Met) in practical diets for Pacific white shrimp Litopenaeus vannamei. A high fishmeal reference diet was formulated with 15% fishmeal, and then, soybean meal (SBM) was used to replace 50% fishmeal as a low fishmeal basal diet (7.5% fishmeal). Graded levels (0.1%, 0.15% and 0.2%) of methionine originating from C‐Met or M‐Met were added to the basal diet. Each diet was randomly assigned to three tanks (40 shrimps per tank) in an indoor flow through seawater system. The results showed that the shrimp fed the basal diet with 0.15% or 0.20% methionine originating from 0.375% or 0.5% M‐Met had significantly higher final weight and weight gain as compared to shrimp fed the basal diet. The supplementation M‐Met in the basal diets resulted in increased serum ammonia in shrimp. Hepatopancreas amylase activity of shrimp showed a decreasing trend with increasing methionine supplementation, which is in contrast with the upswing trend in trypsin at pancreatic segment. This study indicated that the diets supplemented with 0.15% or 0.20% of methionine from M‐Met (0.58% or 0.65% of dietary methionine respectively) were effective in improving the nutritional value of SBM‐based diets deficient in methionine (0.48%) for the Pacific white shrimp.

中文翻译:

日粮中结晶性蛋氨酸和微囊化蛋氨酸对太平洋白对虾凡纳滨对虾的功效

进行了为期8周的生长试验,以评估结晶蛋氨酸(C-Met)或微囊化蛋氨酸(M-Met)在太平洋白对虾凡纳滨对虾的实际饮食中的功效。将高鱼粉参考饮食与15%鱼粉一起配制,然后用豆粕(SBM)代替50%鱼粉作为低鱼粉基础饮食(7.5%鱼粉)。将来自C-Met或M-Met的蛋氨酸的分级水平(0.1%,0.15%和0.2%)添加到基础饮食中。在通过海水系统的室内流中,每种饮食被随机分配到三个池中(每个池中有40只虾)。结果表明,与喂食基础饲料的虾相比,喂食基础饲料中0.375%或0.5%M-Met的0.15%或0.20%蛋氨酸的虾的最终体重和增重显着更高。在基础饮食中补充M-Met会导致虾中的血清氨含量增加。虾的肝胰腺淀粉酶活性随蛋氨酸添加量的增加而下降,与胰蛋白酶在胰段的上升趋势相反。这项研究表明,从M-Met中补充0.15%或0.20%的蛋氨酸的饮食(分别为饮食蛋氨酸的0.58%或0.65%)可有效提高基于SBM的蛋氨酸缺乏(0.48%)的饮食的营养价值。太平洋白虾。
更新日期:2020-07-30
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