In summer, most of growth performance traits studied of the New Zealand White (NZW) broiler male rabbits were inversely affected. Final live body weight, body gain weight, daily feed intake, feed cost, return from body gain and final margin, weights of carcass, fore part, intermediate part, hind part, head, kidney and kidney fat, as well as, blood total protein, albumin, globulin, albumin-globulin ratio and total lipids, were lower in summer than in winter. Supplementation of heat-stressed rabbits with palm oil (10% of the diet) improved final live body weight, body gain weight, feed conversion, final margin, albumin-globulin ratio and weights of carcass fore part, intermediate part, hind part and kidney. On the other hand, feed intake, feed cost, water intake, respiration rate, rectal temperature, plasma total protein, albumin, globulin, total lipids, cholesterol decreased. Tafla (which is a natural clay) addition (5% of the diet) to heat-stressed rabbit diets increased final live body weight, body gain weight, feed conversion, return from body gain, final margin,. and weights of carcass, fore part, intermediate part and hind part and decreased feed intake, water intake, respiration rate, rectal temperature, blood total protein, albumin, globulin and cortisol. Treatment of heatstressed rabbits by drinking cool water (10-15" C) increased final live body weight, gain weight, feed intake, feed conversion and final margin and decreased water intake, respiration rate, rectal temperature, plasma total protein, albumin and albumin-globulin ratio. Drinking cool water showed the highest body weight, total body gain and margin percentage. l l words: Heat stress, alleviation, productive performance, blood metabolites, carcass.