A total of 160 laying hen (Hisex- Brown)  at 19 week old was selected and divided into 4 treatments,  10 pen  per treatment  and 4 laying hen/pen in a completely randomized design  experiment.  The experiment was conducted to evaluate the effects of Trafish by-product fat (MC) added to the diets at 0, 2, 4 and 6%. Hens were housed in pad cooling system house during 26 weeks and divided into 2 periods 20-25 and 26-45 weeks of laying age.The results showed no significant effects on egg production and egg weight although there was a light tendency of reducing egg number in MC6 (86,3%) compared with MC0 (90%) in second period of laying. Howerver, daily feed intake was highest (93,1 and 109 g/hen/day ) in MC0 and lowest ( 89,2 and 99,1 g/hen/day) in MC6