No abstract

No abstract

No abstract

Meat meal, meat-and-bone meal, corn gluten meal, and rapeseed meal were evaluated in dividually as partial replacement for fish meal in single moist pellet diets for young yellowtail Seriola quinqueradiata.Brown fish meal in the diet was replaced isonitrogenously and isocalorica ly with 10, 20, and 30% of each source.Better growth and feed efficiency were found in fish fed on diets with replacement of 10% of all the protein sources used, and the performance further increased as the replacement with meat meal was increased up to 30%.On the other hand, the performance tended to decrease as the replacement of other sources were increased to levels of more than 10% , and the worst performance together with diminished blood and serum characteristics were found in fish fed on the diet with 30% rapeseed meal. These results show that fish meal can be replaced with several cheaper proteins such as meat meal and corn gluten meal within limited amounts, and t hat the adequate addition of these protein sources to fish meal-based diets improves not only the dietary cost but also their performance.

No abstract

Two experiments were conducted with flounder to examine phytase pretreatment or dietary phytase supplement for improving phosphorus (P) utilization of soybean meal (SBM) or soy protein concentrate (SPC). In experiment I, three SBM based‐diets, SBM (basal), phytase‐supplemented SBM (supplement), and phytase‐pretreated SBM (pretreatment), were fed to flounder, and digestibilities of P, gross energy (GE) and crude protein (CP) were measured by an indirect method. In experiment II, three SPC based‐diets including P‐supplemented mineral mixture (control), P‐free mineral mixture (unsupplemented), or P‐free mineral mixture supplemented with phytase (supplement) were fed to flounder for 50 days, and growth, whole‐body P composition, and plasma mineral concentration were determined. In experiment I, a significantly higher absorption of P was found in fish fed the pretreatment or supplement diet compared to the fish fed the basal diet. In experiment II, the growth of fish fed the supplement diet was comparable to that of the control and better than that of fish fed the unsupplemented diet. Whole‐body P retention and plasma P concentrations of supplement‐fed fish were significantly higher than those of fish fed the unsupplemented diet. These results suggest that phytase supplementation to the SBM‐ or SPC‐based diets improves phytase‐bound P availability for Japanese flounder.

No abstract

No abstract