Effect of partially substituting concentrate feed mixture by either fresh or waste oil in sheep diets

Seven digestibility trials were carried out on sheep to study the effect of replacing concentrate feed mixture (CFM) with varying amounts of fresh (raw) sunflower oil or heated oil from bean cake (Taamiah) frying, in almost isocalorific and isonitrogenous diets. Boiling altered the physical and chemical properties of oil but not significantly except for the peroxide value (P < or = 0.05). Substitution with fresh oil significantly increased the digestibility of nutrients, whereas the boiled lead to conflicting results where all the digestibilities tended to decrease. The feeding value was also affected by the addition of oil. The blood analyses of the animals reflected biochemical changes indicating some dysfunction of the internal organs, in particular the liver showed signs of hyperlipidaemia and hypercholesterolaemia. It was concluded that the loss of CFM energy could be partly substituted by fresh oil or by a small amount of waste oil.