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A total of 6000 shrimp (initial body weight of 0.82±0.02g) were randomly distributed into twelve concrete pools (4.5m×3.5m×0.5m) with 500 shrimp per pool and 3 pools per diet, respectively. Four kinds of isonitrogen and isoenergetic diets were formulated with 0, 0.1%, 0.2% and 0.3% Yucca schidigera extract (YSE), respectively. The experiment lasted 100d. The results showed as follows: when supplemented...
Glutamine synthetase (GS) is a key enzyme involved in nitrogen metabolism and glutamine synthesis. A 1455bp cDNA clone encoding GS was isolated from Litopenaeus vannamei (LvGS, JN620540.1). The sequence consists of a 75bp 5′ untranslated region followed by a 1101bp open reading frame corresponding to 366 amino acids. The encoded protein has a 67% to 93% overall amino acid sequence identity with its...
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