This study was aimed to know the effects of dietary nucleotide on the immune organs performance of broiler chickens raised under different environmental conditions. The material used was unsexed 165 birds broiler chickens 15 days old with an average body weight of 462.20±9 g (CV 3.95%), and nucleotide supplemen. The experiment was completely randomized design with factorial patern 3×3 and 5 repeats. The first factor is three different levels of dietary nucleotide T0=0g/kg, T1=0.5g/kg and T2=1g/kg of feed and the second factor is environmental conditions with S 1 =32±1°C, S 2 =23±1°C and S 3 =24 -34°C. The parameters observed were: relative weight of immune organs that is bursa fabricius, thymus and spleen. Data were analysis of variance to determine the effect of treatment at the level of 5%. It will be followed by Duncan's test if there is real treatment effect. The results showed that there was no interaction of dietary nucleotide with raised under different environmental conditions (P>0.05) and fed dietary nucleotide. Comfortable environment signifficantly (P<0.05) improved relative weight of thymus, however hot environment reduced relative weight of thymus and bursa while enhanced relative weight of spleen. In conclusion, comfortable environment supported performance of immune organs, and hot environment inhibited performance of immune organs.
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