A Study on the Effects of Supplementary L-arginine and L-ornithine on the Growth Indices in Rainbow Trout, Oncorhynchus Mykiss
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Nasim Rostamkhani , Reza Malekzadeh-Viayeh  |
, n.rostamkhani@gmail.com |
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Abstract: (10183 Views) |
Introduction: Fish are useful models for
physiological studies in which using nutritional, growth and hormonal indices
can lead to the understanding of several biological mechanisms in vertebrates.
In this study, the effects of the addition of two amino acids, L-arginine and
L-ornithine, to a commercial feed on the growth indices and the blood levels of
insulin-like growth factor-I (IGF-I) of rainbow trout, Oncorhynchus mykiss were
examined. Materials and Methods: The fish (average initial weight 45±4
g) were fed for 8 weeks with one of the following 4 dietary treatments: Commercial
trout diet supplemented with 2% L-arginine-(T1) 2% L-ornithine-(T2) 2%
L-arginine + 1% L-ornithine-(T3) 3% L-arginine + 1% L-ornithine-(T4) and the
commercial feed without addition of the amino acids (controls). Results:
According to the results, maximum weight gain (268.94±5.84%) and specific
growth rate (SGR) (2.33±0.05% day–1) were observed in the fish of group T3,
while maximum hepatosomatic index (HSI) (1.49±0.04%) was recorded in group T4.
These amounts were significantly higher than their counterpart indices of the
control group (P<0.05). Supplementing the feed with the amino acids, overall,
increased IGF-I levels throughout the study period. At the end of the eighth
week, in the T3 and control groups maximum and minimum IGF levels were 1180
pg/ml and 980.35 pg/ml respectively. Conclusions: Results of this study
showed the positive effects of providing fish diet with additional amino acids,
especially a combination of arginine and ornithine, on growth promotion in
rainbow trout. |
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Keywords: Oncorhynchus mykiss, Growth, Insulin-like growth factor-I (IGF-I), Amino acid supplementation, L-arginine, L-ornithine |
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Full-Text [PDF 495 kb]
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Type of Study: Original |
Subject:
Physiology Received: 2014/02/7 | Accepted: 2014/08/12 | Published: 2014/10/11
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