Partial replacement of dietary protein nitrogen with dispensable amino acids in diets of Nile tilapia,Oreochromis niloticus |
| |
Affiliation: | 2. First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China;2. Fitoplancton Marino, S.L. Dársena Comercial s/n (Muelle Pesquero). 11500 El Puerto de Santa María (Cádiz), Spain;3. Ifremer, Laboratoire d''Ecotoxicologie, Place Gaby Coll, BP 7, 17137 L''Houmeau, France |
| |
Abstract: | Eighteen groups of 40 juvenile tilapia (Oreochromis niloticus) were fed five experimental diets in which crude protein (30% dry matter) was replaced at a level of 25% by dispensable amino acids (DAA) in the free form, given singly (alanine, glutamic acid or glycine) or as a mixture and at a level of 50% by DAA mixture. At the 25% substitution level, irrespective of the nature of the DAA, growth was slightly reduced (10%), while glycaemia, nitrogen retention and excretion were unaffected. A 50% substitution with the DAA mixture resulted in a marked reduction in growth (50%), a modified pattern of glycaemia and a lower nitrogen retention associated with a higher nitrogen excretion. Results suggest that DAA should not account for more than 60% of the total amino acid supply in tilapia diets. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|