Partial or total replacement of fish meal by soybean protein on growth, protein utilization, potential estrogenic or antigenic effects, cholesterolemia and flesh quality in rainbow trout, Oncorhynchus mykiss

摘要: Abstract Groups of rainbow trout (initial body weight 83 ± 1 g) were fed diets (crude protein (CP) 46%; gross energy 21 kJ/g DM; crude fat 12%) containing graded levels either a soyflour (CP 52% DM) or soy concentrate 72% supplemented with L-methionine as partial total replacement fish meal protein. A growth trial was conducted over 12 weeks at water temperature 18 °C. Digestibility the dietary ingredients and complete determined using an indirect method. At end trial, in addition to composition analyses, following parameters measured: plasma vitellogenin cholesterol, antigenic activity (passive haemagglutination) sources antisoya antibodies serum, phytoestrogens bile. Sensory physical evaluations flesh also made. Replacement (33 100% replacement) did not affect performance nutrient utilization. However, (up 50%) reduced rate, casein alone, equal amounts. Plasma significantly affected by from soybean. No detected serum soy-based diets. Few present but only trace amounts bile cholesterol soybean comparison those meal. Physical sensory quality little treatments.