ニジマス稚魚の成長および血液性状に及ぼす飼料α化率と可消化エネルギ-含量の影響

概要

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This study was conducted to investigate the effect of gelatinized ratio (GR) and digestible energy (DE) content on growth and blood profile of rainbow trout fingerlings (4.7g on aver-age). The fish were fed low energy (DE: 298-334kcal/100g) or high energy (DE: 334-395kcal/100g) diets with different levels of GR adjusted using raw and extruded potato starch at a 30% level. At both dietary energy levels, growth, feed efficiency, and protein efficiency ratio were all improved by elevation of dietary GR levels, and reached a virtual plateau at around 40% GR. Daily feed consumption was inversely related to the dietary GR. At the same DE level (334kcal/100g) of both low and high energy diets, growth was higher in fish fed a diet with a higher GR. The apparent digestibility of dietary protein was not influenced by dietary GR at either of the energy levels. Digestibility of lipid in the high energy diets and starch and energy in both energy levels increased with an increase of dietary GR. Blood profiles were also affected by both dietary GR and energy levels. A suitable level of GR in the diet for rainbow trout was estimated to be more than 40%, regardless of DE levels.
日本水産學會の論文