effect different levels of nitrate water on performance and blood parameter of broiler chicks

this experiment was conducted to evaluate of different levels of water nitrate on performance and blood parameter of broiler chicks. 240 day old ross 308 were assigned in 5 treatments, 4 replicates and 12 chicks per replicate in a completely randomized design. treatments so that water nitrate concentration was 10 mg in drinking water of poultry farm (control group or cg) and another treatment 40, 70, 100 mg/ lit nitrate used. a group used from minimum nitrate(mn) water (nitrate, 1.8 mg/ lit) respectively. results showed that different levels of water nitrate did not affect on feed intake (fi), but in distance 42-0 days group used from mn water compared to the control group fi significantly reduced. treatments in 21-0 days was no effect on fi. body weight gain (42 days) in cg comparative another groups significantly increased, but different levels of nitrate had no effect on body weight gain in 21 days. taking 100 mg of nitrate caused a significant increase feed conversion ratio (fcr) in 42-1 days. minimum fcr was showed that in cg. the results about lymphoid organs showed that maximum weight of spleen and bourse observed in group receiving 70 mg/lit nitrate. group drinking mn water had minimum weight of spleen and bourse, but the thymus weight in another groups higher than the cg. different levels of nitrate had no effect on blood hdl, but on the another blood parameter had significant effect (p<0/05). nitrate levels increased sodium, potassium and calcium in the blood. in addition, glucose and ldl and the ldl / hdl levels of blood also increased. the control group showed the highest levels of blood protein .the overall results showed that increasing water nitrate levels and mineral water are reduced broiler performance and nitrate levels increased the of glucose and ldl in broiler chicks.