Open AccessComparative study on the utilization of different lysine sources by channel catfish ( I ctalurus punctatus )
Author(s) -
Zhao J.X.,
Li X.Q.,
Leng X.J.,
Peng S.,
Hu J.,
Zhao X.X.,
Shi Z.
Publication year - 2017
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12450
Subject(s) - lysine , ictalurus , catfish , biology , zoology , alanine , amino acid , meal , alanine aminotransferase , feed conversion ratio , ictaluridae , food science , biochemistry , body weight , fish <actinopterygii> , endocrinology , fishery
In this study, five diets were formulated, namely positive control, negative control (lysine deficient) without or with the addition of crystalline l ‐Lys· HC l, l ‐Lys·H 2 SO 4 and microcapsulated l ‐lysine· HC l (M‐Lys), and then fed to channel catfish with an initial body weight of 76.0 ± 0.3 g to investigate the effects of various lysine sources on the growth. After 8‐week feeding, the fish fed M‐Lys diet, but not Lys· HC l or Lys·H 2 SO 4 diet, had a higher weight gain, a higher protein retention ratio and a lower feed conversion ratio than that fed negative control ( P < 0.05), and showed a similar growth as positive control. The serum free amino acid level of Lys· HC l and Lys·H 2 SO 4 group reached the plateau at the 2nd h after feeding, while the other three groups peaked at the 4th h. In Lys· HC l and Lys·H 2 SO 4 groups, the activities of liver aspartate aminotransferase and alanine aminotransferase peaked at the 2nd h, but M‐Lys group peaked at the 6th and 4th h after feeding, respectively. The above results indicated that the supplementation of M‐Lys rather than Lys· HC l or Lys·H 2 SO 4 in lysine‐deficient diet could improve the growth performance of channel catfish, due to the delayed absorption of supplemental lysine.