Comparative study on the utilization of different lysine sources by channel catfish (Ictalurus punctatus). (25th June 2016)

• Record Type: Journal Article
• Authors: Zhao, J.X.; Li, X.Q.; Leng, X.J.; Peng, S.; Hu, J.; Zhao, X.X.; Shi, Z.
• Is Part Of: Aquaculture nutrition. Volume 23:Number 4(2017:Aug.)
• Page Start: 833
• Page End: 843
• Publication Date: 2016-06-25
• Subjects: channel catfish -- growth -- lysine·H2SO4 -- lysine·HCl -- microcapsulated lysine -- utilization; Aquaculture -- Periodicals; Aquatic animals -- Feeding and feeds -- Periodicals; Fishes -- Feeding and feeds -- Periodicals; 639.3
• DOI: 10.1111/anu.12450
• Languages: English
• ISSNs: 1353-5773

Abstract

Abstract: In this study, five diets were formulated, namely positive control, negative control (lysine deficient) without or with the addition of crystallinel ‐Lys·HCl, l ‐Lys·H2 SO4 and microcapsulatedl ‐lysine·HCl (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·HCl or Lys·H2 SO4 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·HCl and Lys·H2 SO4 group reached the plateau at the 2nd h after feeding, while the other three groups peaked at the 4th h. In Lys·HCl and Lys·H2 SO4 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·HCl or Lys·H2 SO4 in lysine‐deficient diet could improve the growth performance of channel catfish, due to the delayed absorption of supplemental lysine.