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Effects of different dietary levels of lysine and methionine amino acids on growth performance, survival rate, and body composition of Caspian Kutum (Rutilus frisii)
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Reza Taati   1, Mohammad Sayad Bourani , Farshad Pourkazem |
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Abstract: (281 Views) |
This study aims to determine the effects of different dietary levels of lysine and methionine amino acids on growth, survival, and carcass composition of Caspian Kutum (Rutilus frisii). A total number of 144 Kutum fingerlings weighing 3.51±0.78g were distributed into twelve 100-L fiberglass tanks with a density of 12 fish per tank. After one week acclimatization period, fingerlings were fed four experimental diets including diet 1: control (without added amino acid), diet 2: 1% methionine+3% lysine, diet 3: 2% methionine+2% lysine, and diet 4: 3% methionine+1% lysine in triplicate groups for 56 days. Results showed that the fish fed with 3% methionine+1% lysine recorded a significant increase in growth parameters such as final weight (6.75±0.30g), final total length (9.21±0.10cm), weight gain (3.22±0.48g), body weight increase (95.76±13.38%), and specific growth rate (1.20±0.09%/day) (p<0.05). The feed conversion ratio was significantly (p<0.05) improved in mentioned treatment. No significant differences were observed in condition factor, protein efficiency ratio, and survival rate between the dietary treatments (p>0.05). A significant difference in the content of carcass protein was recorded between fish fed different levels of dietary lysine and methionine amino acids with the control group (p<0.05) so that fish fed 3% methionine+1% lysine showed the highest content of carcass protein (16.69±0.35%) (p<0.05). On the other hand, the fish fed with the control diet and diet 3 showed the highest (p<0.05) carcass lipid content. Significant differences were also recorded in the contents of ash and moisture between experimental treatments (p<0.05). According to the obtained results, it can be declared that the level of 3% methionine+1% lysine is optimum for Caspian Kutum. |
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| Keywords: Caspian Kutum, Essential amino acids, Feeding efficiency, Carcass quality |
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Full-Text [PDF 657 kb]
(80 Downloads)
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Type of Study: Research |
Subject:
تغذيه
Received: 2024/07/19 | Accepted: 2024/08/31 | Published: 2024/10/2
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