Studies on the use of rapeseed oil meal (obtained from doubly improved rape variety) in rainbow trout (Salmo ga-irdneri f. kamloops) feeding

II. Utility and optimal content of rapeseed oil meal in the feed mixtures for rainbow trout fattening

Abstract

Studies were carried out on five feed mixtLires containing different levels of rapeseed oil meal. The meal was obtained from doubly improved winter rapeseed variety "Jantar". It substituted soybean oil meal and partly fish meal in the feed mixtures. It was found that rapeseed oil meal can be an isoactive substitute for soybean oil meal. Optimal content of this component in the feed mixture was 10.5% Trout fed the feeds in which rapeseed oil meal substituted part of the fish meal was characterized by lower growth and worse utilization of the feeds.