EFFICIENCY OF USING MIXED FEEDS WITH DIFFERENT ENERGY LEVELS IN FEEDING LARVAE AND FRY RAINBOW TROUT
| Autor: | V. M. Kondratiuk |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Тваринництво та технології харчових продуктів, Vol 11, Iss 2, Pp 48-55 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2706-8331 2706-834X |
| DOI: | 10.31548/animal2020.02.048 |
| Popis: | The article considers the effectiveness of the use of mixed feeds with different levels of metabolic energy for the cultivation of larvae and fry of rainbow trout. The aim of the experiment was to establish the influence of different levels of energy supply of trout on its performance. For this purpose, five experimental groups were formed by the method of analogues. During the equalization period, the experimental fish consumed feed of the control group. In the main period, the level of metabolic energy in trout feed ranged from 14 to 18 MJ. As a result of the conducted researches it is established that the increase of energy content in compound feed for trout larvae and fry from 16 to 18 MJ contributes to the increase of their weight by 11.1 % (p < 0.05) and growth intensity - by 5.6-14.2 %, while the reduction of energy content to 14 MJ / kg contributes to a probable decrease (p < 0.05) in mass by 11.9%, and a decrease in growth intensity by 6.0-14.7 %. It is proved that the feed consumption per 1 kg of weight gain in trout larvae and fry, which received feed with an energy content of 18 MJ was lower by 5.1 %, and with its content of 14 MJ - 4.8 % higher compared to fish consuming feed with an energy content of 16 MJ / kg. The safety of the experimental fish throughout the experiment was close and ranged from 83.1 to 84.9 %. However, it is most economically feasible to grow trout that consume feed with a nutritional value of 16 MJ of metabolic energy, compared with a decrease or increase of this indicator to 14 or 18 MJ, respectively |
| Databáze: | Directory of Open Access Journals |
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