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Comparison of L‐lysine· HC l and L‐lysine sulphate in the feed of P enaeus monodon and re‐evaluation of dietary lysine requirement for P . monodon
Author(s) -
Niu Jin,
Chen Xu,
Lin HeiZhao,
Li ChunHou,
Wu KaiChang,
Liu YongJian,
Tian LiXia
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12868
Subject(s) - penaeus monodon , shrimp , lysine , biology , zoology , dry matter , weight gain , feed conversion ratio , food science , biochemistry , fishery , body weight , amino acid , endocrinology
Two trials were conducted to compare L‐lysine HC l and L‐lysine sulphate regarding its availability to Penaeus monodon , and further evaluate the optimum dietary lysine requirement. In experiment 1, five experimental diets were formulated (D1, D2, D3, D4 and D5), a basal diet (D1), aimed at a low‐lysine concentration (2.22% dry matter), with lysine concentration of the other four diets increasing in two 0.25% L‐lysine intervals from either L‐lysine HC l (D2 and D3) or L‐lysine sulphate (D4 and D5). Each diet was fed at a restricted rate to three groups of 40 shrimp for 74 days. The highest values of growth performance (weight gain, WG ; specific growth rate, SGR ) and survival were observed with shrimp fed the L‐lysine HC l diet. Feed efficiency ( FE ) of shrimp fed D2 was significantly higher than that of shrimp fed D1 and D5 ( P < 0.05), but without significant difference with shrimp fed D3 and D4 ( P > 0.05). In experiment 2, six diets (d1, d2, d3, d4, d5 and d6) were formulated with six graded levels of lysine (2.21%, 2.41%, 2.59%, 2.87%, 3.11% and 3.29% of diet). Each diet was randomly assigned to triplicate groups of 40 shrimp for 74 days. WG , SGR and survival increased increasing levels of lysine up to 2.41% of diet and reached an apparent plateau. Broken‐line model analysis on WG and SGR indicated that the optimum dietary lysine level for optimal growth of shrimp was 2.37% of diet, corresponding to 5.78% of dietary protein. In conclusion, results of this trial suggest that L‐lysine HC l is superior to L‐lysine sulphate when fed to Penaeus monodon and optimal growth can be obtained at lysine levels corresponding to 2.37% of diet, or 5.78% of dietary protein in this specie.