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ARS Home » Pacific West Area » Aberdeen, Idaho » Small Grains and Potato Germplasm Research » Research » Publications at this Location » Publication #235637
Title: Apparent Amino Acid Availability from Feedstuffs in Extruded Diets for Rainbow Trout Oncorhynchus mykiss.

Author
item Gaylord, Thomas
item Barrows, Frederic
item Rawles, Steven - Steve

Submitted to: Aquaculture Nutrition
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/26/2009
Publication Date: 6/22/2009
Citation: Gaylord, T.G., Barrows, F., Rawles, S.D. 2009. Apparent Amino Acid Availability from Feedstuffs in Extruded Diets for Rainbow Trout Oncorhynchus mykiss. Aquaculture Nutrition. doi: 10.1111/j.1365-2095.2009.00678.x

Interpretive Summary: Apparent amino acid availability coefficients of several typical and novel feed ingredients were determined in rainbow trout using extruded diets and the fecal stripping technique. The ingredients tested included five fish meals, three terrestrial animal by products, five plant protein concentrates, four plant meals, and seven low-protein plant ingredients. Amino acid availability from the fish meals was relatively high ranging from 90 to 101%. No differences in apparent amino acid availability were detected among the animal by-products. Within the plant concentrate group, rice protein concentrate and barley protein concentrate exhibited generally lower amino acid availabilities compared to other concentrates tested. Among the plant meals, only the availabilities of histidine, valine, isoleucine and lysine in flaxseed meal were lower than those of soybean meal. Apparent amino acid availabilities among the low-protein plant products were variable and significantly different.

Technical Abstract: Apparent amino acid availability coefficients of several typical and novel feed ingredients were determined in rainbow trout using extruded diets and the fecal stripping technique. The ingredients tested included five fish meals, three terrestrial animal by products, five plant protein concentrates, four plant meals, and seven low-protein plant ingredients. Amino acid availability from the fish meals was relatively high ranging from 90 to 101%. Lower coefficients overall were observed for Menhaden fish meal FAQ when compared to the other fish meals. No differences in apparent amino acid availability were detected among the animal by-products. Within the plant concentrate group, rice protein concentrate and barley protein concentrate exhibited generally lower amino acid availabilities compared to other concentrates tested. Among the plant meals, only the availabilities of histidine, valine, isoleucine and lysine in flaxseed meal were lower than those of soybean meal. Apparent amino acid availabilities among the low-protein plant products were variable and significantly different.