The estimated AME of the SO, RSO and ASO oils were 37.32, 37.13 and 32.85 MJ/kg when
measured directly from oil digestibility coefficients and 38.19, 37.44 and 33.33 MJ/kg when
calculated by difference, respectively. In Exp. 2, there were 12 dietary treatments arranged
factorially with three oil sources, two levels of supplemental vitamin E (10 vs. 250 IU/kg)
and two levels of supplemental vitamin C (0 vs. 250 mg/kg). Each diet was replicated five
times and the experimental unit was a cage with five hens. Diet did not affect laying hen
performance or egg quality traits in any of the periods considered. It is concluded that when
well processed, recycled soy oil and acidulated soy oil soapstock are good alternatives to
refined soybean oil in diets for laying hens. Under the conditions of this research, the supplementation
of the diet with extra amounts of vitamin E and C to increase egg production
or egg quality was not justified