The Usage Of Cottonseed Meal Including Different Amounts Of Gossypol In Diet Of Rainbow Trout (Onchorhyncus Mykiss)
Upotreba brašna od semena pamuka sa različitim sadržajem gosipola u ishrani kalifornijske pastrmke (onchorhyncus mykiss)
Author
Yousefi, Siamak
Izadian, Mona
Keywords
cotton seed mealGossypol
nutrition
rainbow trout
Onchorhyncus mykiss
Metadata
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Cotton culture is common in many of area of Iran, especially Khorasan province. This study is considering the usage of cotton seed meal with different amount of Gossypol in rainbow trout (Onchorhyncus mykiss) diet.
In this examination, the effect of different amounts of Gossypol (common cotton seed, cotton seed with low Gossypol, and cotton seed without Gossypol in Rainbow trout growth in (GFT²) stage was examined. At the beginning of the experiment, the fish’s weights were 140 gr. In this experiment, 240 Rainbow trout were kept in the training ponds with the 2.240×1.10 meter square dimensions and 0.75 meter depth. Each treatment consisted of 20 Rainbow trout fish. The required water for culturing was provided from a spring in a research center (near Tehran) which was close to the farm with mean temperatures of 14 Celsius.
We consider out four experimental diets including common cotton seed, cotton seed with low Gossypol, and cotton seed without Gossypol for feeding during a six week cultural period.
The diets which consisted of diverse levels of common cotton seed had significant differences (α=0.5%) on weight increasing, total length increasing, standard length increasing and conversion factor. In comparing between different treatments, fish fed with the diet which had common cotton seed had significant differences in the statically sight in weight, conversion factor, FER, total and standard length regarding the other diets and also had the worst condition.