Some Properties of the Chick Growth Inhibitor in Linseed Oil Meal

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Abstract
Linseed oil meal depressed the growth of chicks when fed at a level of 30% of the diet. Water treatment and autoclaving were effective in destroying the growth depressing factor while dry heat was ineffective. Linseed grits, produced with some steam treatment, were less growth depressing than old process or solvent process meal, but still responded to water treatment or pyridoxine supplementation. Aureomycin did not improve the growth of chicks fed linseed oil meal indicating that there was no stimulation of pyridoxine synthesis by the antibiotic. Single daily doses of pyridoxine given orally or injected intraperitoneally or intramuscularly were approximately half as effective as pyridoxine in the feed in counteracting the growth inhibitor. Pyridoxine, pyridoxal and pyridoxamine were equally effective, on a molar basis, in counteracting the growth inhibitor.