Effect of Boron on broiler productive traties and immune response of Newcastle disease vaccine

This study was performed to investigate changes in growth performance, blood pictures, weights of internal organs and immune response to Newcastle disease vaccine (ND vaccine) of broilers fed different levels of Boron (75,150 and 250mg/kg) in feed from 5 weeks. 120 broiler chicks (one day old) were randomly divided into four equal groups (each group contain 30), as following: first group (G1) was received 75 mg/kg of Boron, second group (G2) was received 150 mg/ kg of Boron, third group (G3) was received 250 mg/ kg of Boron and fourth group (G4) was not received Boron in feed and consider as control, All groups were vaccinated with ND vaccine at 10 and 20 days old, Growth performance of the chicks (Body weight, weight gain and mortality rate) were weekly determined, at the end of experiment weights of internal organs (liver, kidney and bursa of fabricius) were determined and Blood samples were collected to measured Ab titer against ND vaccine by ELISA test and to determined blood pictures (RBCs, PCV, HB), The results of this study showed that body weight, weight gain, blood pictures and Ab titers were highly significant increase (p 0.01) in G2 as compared to control group followed by G3 and G1 respectively in all weeks. The mortality rate was significantly decrease (p 0.01) in G1, G2 and G3. Whereas the weights of internal organs (liver, kidney and bursa of fabricius) were significantly increase in G3, G2 and G1 respectively. In conclusion, the results indicated that all levels of Boron supplemented diet of broiler chicken caused improvement of growth performance blood parameters and withoutinhibition of the immunity response of chichen against newcastle disease vaccine