The effect of dietary fat in market rainbow trout on fish weight gain, conversion coefficient and chemical composition of body
1997
Parova, J. | Herman, M. | Prokop, V. (Vyzkumny Ustav Vyzivy Zvirat, Pohorelice (Czech Republic))
An experiment was conducted on 17,122 market rainbow trouts kept in concrete-made pools of 1 m*[3] water volume to determine the effect of 4 % addition of three kinds of oils (fish, rapeseed and sunflower) to diets of an uniform formulation (average fat content of 11 %) on feed efficiency and some other parameters. Two imported feeds with 13.35 % and 18.49 % fat contents for market rainbow trout were used parallelly with the diet of domestic formulation. The effect of the kind of oil on feed efficiency was insignificant. The difference in feed efficiency between the imported feeds with 13.35 % of fat and the domestic diets formulation was also insignificant. The highest feed efficiency was achieved by administration of imported feeds with 18.49 % fat and 38.3 % crude protein. The chemical composition of rainbow trout body samples was affected insignificantly by the use of five types of feeds. A trend toward the lowest fat content in fish bodies and the highest crude protein content was observed in a group receiving the domestic diet with an addition of 4 % rapeseed oil.
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