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The effect of lysine supplementation on growth performance, carcass composition and digestibility of nutrients in juvenile rainbow trout (Oncorhynchus mykiss) fed with a low protein diet
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Hossein Ouraji *   , ROhollah Mehrani , Farid Firozbakhsh , Khosrow Jani khalili |
| Department of Fisheries, Faculty of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran , hoseinoraji@yahoo.com |
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Abstract: (56 Views) |
Introduction: The aim of this study was to investigate the effect of different levels of lysine on growth performance, carcass composition and digestibility of nutrients in rainbow trout fed with a low protein diet.
Materials and Methods: For this purpose, 400 fish with an average initial weight of 6 grams were purchased and distributed in 18 tanks for 8 weeks. Six experimental treatments include diet containing 42% protein and 24% fish meal (control 1), 37% protein and containing 24% fish meal (control 2), 37% protein and containing 12% fish meal (control 3), and diet The ones containing control 3 as a base were supplemented with 0.25, 0.5 and 1% lysine. The treatments were considered in 3 replications with 20 pieces of fish for each replication.
Results and Discussion: The result showed that decreasing the percentage of dietary protein led to a significant decrease in final weight, increase in body weight and specific growth rate (P<0.05). Adding different levels of lysine to the diet improved these values so that they were not significantly different compared to control 1 (P>0.05). The food conversion was significantly improved in fed fish by 0.25% and 0.5% (P<0.05). Also, the protein of fish carcasses fed with 0.5% lysine was similar to control 1, and this amount decreased significantly in other treatments (P<0.05). In addition, protein digestibility decreased significantly with the reduction of both protein and fish meal in the diet (control 3), while in controls 1 and 2 and treatments containing 0.25 and 0.5% lysine, it was higher than others experimental treatments.
Conclusion: it seems that by adding 0.5% of lysine, the protein in the diet of baby rainbow trout can be reduced from 42% to 37% and fish meal from 24% to 12% without having a detrimental effect on growth. Carcass quality and protein digestibility.
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| Keywords: Amin acid, protein restriction, growth performance, carcass composition |
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Type of Study: Research |
Subject:
Special
Received: 2024/07/24 | Accepted: 2025/04/18 | Published: 2025/09/23
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