Economical analysis of replacing slaughterhouse byproduct meals in salmonid (Oncorhynchus mykiss) fry diets

The possibilities of replacing slaughterhouse byproduct meals (blood meal, poultry-by products, meat and bone meal) into menhaden fish meal in salmonid (rainbow trout fry) diets were economically analyzed in this study. Fish meal levels of diets were balanced as 30% and 45%, and 10 test diets with average 34% (first five diets) and 41% (last five diets) protein and about 3500 kcal/kg metabolic energy were made by replacing 0, 25, 50, 75 and 100% slaughterhouse byproducts into these categories of fish meal. As a control feed, a commercial feed with 55% protein (min.) and 2900 kcal ME/kg was used. Rainbow trout fry with an average 1.75 +/- 0.08 g initial weights were fed with prepared test diets and control diet as three replicates (in total 33 tanks) for a period of 150 days ( 140 feeding days). In aspects of the economic analysis of the feeds, various profits obtained from the groups, and the differences between the profits were statistically significant (p < 0.01). In conclusion, it was found that substitution of the slaughterhouse byproducts meal into.