R.C. Summerfelt H. G. Ketola J. M. Luzier 1995 <p><span>Feeds formulated with 5.7, 11.4 and 22.7% spray-dried blood powder, also called blood flour (88.1% protein, 0.2% total phosphorus), were compared with a control diet with 49% herring meal (64% protein, 2.1% total phosphorus) and no blood powder for rearing juvenile rainbow trout.&nbsp;</span><i>Oncorhynchus my kiss</i><span>&nbsp;(Walbaum). Diets with 5.7, 11.4 and 22.7% blood powder contained 1.22,1.03 and 0.84% phosphorus, respectively, compared with 1.36% phosphorus in the control diet. Over 12 weeks, differences in mean specific growth (range 2.23-2.35 day</span>⁻¹<span>) or feed conversion (range 1.04-1.09) among the four diets were not significant (</span><i>P</i><span>&nbsp;&gt; 0.05). Apparent digestibility of phosphorus in the diet with 22.7% blood powder was greater (45.2%) than that in the control diet (31.6%). Increases in phosphorus concentrations in the water in which trout were fed diets with blood powder (range 16-20 μg</span>⁻¹<span>&nbsp;total phosphorus) were 33-47% less (</span><i>P</i><span>&lt;0.05) than in tanks where trout were fed the control diet (30μg</span>⁻¹<span>&nbsp;total phosphorus). Feed formulations for rainbow trout prepared with 22.7% blood powder and 17.0% fish meal would contain 65.3% less fish meal and 38% less total phosphorus than present in the control diet, which was a representation of a modern feed formulation for rainbow trout.</span></p> application/pdf 10.1111/j.1365-2109.1995.tb00948.x en Wiley Partial replacement of fish meal with spray-dried blood powder to reduce phosphorus concentrations in diets for juvenile rainbow trout, Oncorhynchus mykiss (Walbaum) article