This experiment was carried out to determine the effects of feeding laying diets supplemented with crude sunflower oil and its refining by-products (sunflower soapstock, acidulated sunflower soapstock and volatile matters) as a source of energy on their laying performance. 168 Hisex Brown hens aged 54 weeks were used. Sunflower oil and its by-products were added at 2.5 % in feeds and the experiment was conducted for twelve weeks.

Addition of sunflower soapstock, acidulated sunflower soapstock and volatile matters to the diets replace sunflower oil had no significant difference on egg production, egg weight, feed intake, feed conversion efficiency and body weight.

These by-products were cost approximately half of sunflower oil and their addition to diets reduced feed cost at 5 %. Sunflower soapstock, acidulated sunflower soapstock and volatile matters, compared with sunflower oil, reduced feed cost for one egg 11.07, 1.10 and 3.85 %, respectively.

It was concluded that by-products from refining crude sunflower oil can be use economically replace crude oil in laying hens without adverse effect.