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Abstract
1. Feeding 4 or 5 g saponin/kg diet depressed food consumption, egg and body weights and liver lipid concentrations. Rate of egg production decreased initially but later returned to normal.
2. At 1 g/kg diet saponin had no effect on food consumption or laying performance but decreased the high liver lipid concentration in two experiments on a heavy (Warren) strain of bird. There was no effect on liver lipid concentration in another experiment using a light (White Leghorn) strain in which liver lipid concentration was low.
3. Excreta lipid, liver cholesterol and plasma high density lipoprotein‐cholesterol concentrations were unaffected by saponin but plasma tri‐glyceride concentrations were decreased.