Aldehyde-Treated Fish and Soybean Meals as Dietary Supplements for Growing Lambs

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Abstract
Aldehyde-treated and untreated fish and soybean meals were compared in three nitrogen balance trials and a feedlot performance trial with growing lambs. Concentrations of glyoxal used for treating the protein sources for the three balance trials were equivalent to 3.75 and 1.875% of the fish and soybean meals, respectively. Nitrogen metabolism of lambs was not influenced by protein source. Treatment of fish meal decreased nitrogen digestibility (P<.05), urinary nitrogen excretion (P<.05), and plasma urea-nitrogen concentration (P<.05) and increased nitrogen retention (P<.05). Similar differences between treated fish meal and treated soybean meal were noted, but the increase in nitrogen retention with treated fish meal was not statistically significant. Protein supplements used in a 42-day feeding trial were treated with formaldehyde equivalent to 0.6 and 0.5% of the fish and soybean meals, respectively. Daily gain was improved 7% by aldehyde treatment and was 10% greater with the fish meal-than with soybean meal-supplemented diets. Feed consumption was 8% lower (P<.05) and feed efficiency 19% greater (P<.05) with the fish meal than with soybean meal diets. These results indicate that lamb performance may be improved with aldehyde treatment of dietary protein supplements and that fish meal may be a more suitable protein supplement than soybean meal for lambs. Copyright © 1972. American Society of Animal Science. Copyright 1972 by American Society of Animal Science.

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