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Metabolizable Energy of Layer Diets Containing Regular or Heat-Treated Flaxseed

Department of Animal and Poultry Science, University of Guelph, Guelph Ontario, Canada, N1G 2W1

Correspondence: S. Leeson, E-mail: sleeson{at}aps.uoguelph.ca

Two experiments were conducted to determine whether the AME_n of diets containing flaxseed could be improved by subjecting flaxseed or flax-based diets to various heat treatments. In Experiment 1, a corn-soybean diet was prepared, and a flaxseed premix was added to produce a diet containing either 10% heat-treated (extruded) flaxseed or 10% flaxseed that was not heat treated. Experiment 2, utilized a commercial diet containing 10% flaxseed that had been processed through an expander. Extruding flaxseed improved its AMEn; however, the AME_n of the expanded diet was significantly (P < 0.05) less compared to a diet that was merely pelleted. The amount of a-linolenic acid (LNA) and docosahexaenoic acid (DHA) deposited in the eggs from hens fed extruded flaxseed was also significantly (P < 0.05) less compared to the hens fed a conventional pelleted diet.

Key Words: flaxseed • apparent metabolizable energy • linolenic acid (LNA) • docosahexaenoic acid (DHA) • laying hen