Dietary requirements for essential branched-chain amino acids by lake trout
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Abstract
In a 12‐week growth study of the dietary requirements of young lake trout Salvelinus namaycush for essential branched‐chain amino acids, the leucine requirement was between 2.74 and 3.66%, and the isoleucine requirement between 1.54 and 2.06%, of dietary protein (as‐fed basis). These ranges are substantially lower than those published and widely used in formulation of salmonid feeds. On the basis of both growth criteria and concentration of free amino acids in blood plasma, the valine requirement was within the range of 1.77 to 2.23% of dietary protein. The upper value of this range is substantially lower than the requirement reported for chinook salmon Oncorhynchus tshawytscha. Plasma valine concentrations in lake trout responded to dietary supplements of valine above the requirement level; the concentrations increased sharply once the requirement was exceeded. This finding is similar to observations recorded in other animals.
Suggested Citation
Hughes, S.G., Rumsey, G.L., and Nesheim, M., 1983, Dietary requirements for essential branched-chain amino acids by lake trout: Transactions of the American Fisheries Society, v. 112, no. 6, p. 812-817, https://doi.org/10.1577/1548-8659(1983)112<812:DRFEBA>2.0.CO;2.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Dietary requirements for essential branched-chain amino acids by lake trout |
| Series title | Transactions of the American Fisheries Society |
| DOI | 10.1577/1548-8659(1983)112<812:DRFEBA>2.0.CO;2 |
| Volume | 112 |
| Issue | 6 |
| Year Published | 1983 |
| Language | English |
| Publisher | American Fisheries Society |
| Contributing office(s) | Leetown Science Center |
| Description | 6 p. |
| First page | 812 |
| Last page | 817 |