Effects of replacing fish meal with rendered animal protein and plant protein sources on growth response, biological indices, and amino acid availability for rainbow trout Oncorhynchus mykiss

Duplicate groups of rainbow trout (mean initial weight 16.7 ± 0.1 g) were fed six isonitrogenous (43.7 % crude protein) diets for 12 weeks. A fish-meal-based diet was designated the control. In the other five diets, 75 or 100 % of the fish meal was replaced with either poultry by-product meal (PBM), hydrolyzed feather meal (FEM), and spray-dried blood meal (BM) or with defatted soybean meal and corn gluten meal. Trout fed the diets in which 75 and 100 % of the fish meal was replaced with rendered animal protein showed comparable growth performance to trout fed the control diet except in terms of the protein efficiency ratio and feed conversion ratio. The feed intake of the trout fed a combination of fish meal and rendered animal protein (either with or without plant protein) was significantly higher than the feed intake of trout on the fish-meal-based diet. Apparent crude protein digestibility coefficients were significantly higher in trout fed the diets in which 75 % of the fish meal was replaced with plant protein sources than in trout fed the diets in which 75 % of the fish meal was replaced with rendered animal protein sources (P < 0.05). These results suggest that a combination of PBM, FEM, and BM is a good substitute for most of the fish meal in practical feed for rainbow trout.

ニジマス用実用飼料において魚粉の75％または100％を養鶏副産物(PBM)、フェザーミール(FEM)、血粉(BM)、脱脂大豆粕(DSM)およびコーングルテンミール(CGM)により代替した飼料を平均体重16.7±0.1gのニジマスに12週間給餌した。動物性タンパク質(PFB、PBM+FEM+BMの混合物)を組み合わせて魚粉を代替した飼料を給餌した魚の成長は正タンパク質効率および飼料効率以外は対照区と同等であった。FM+PFB飼料およびFM+PFBDC飼料の摂餌量は他の試験区よりも高かった。以上からPBM、FEM、BMの混合により成長や健康状態に悪影響を及ぼさずに魚粉を代替できることが示唆された。

source:https://link.springer.com/article/10.1007/s12562-014-0818-7

source:https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-26252034/

source:https://nrid.nii.ac.jp/ja/nrid/1000080154053/

identifier:26252034