الفهرس Only 14 pages are availabe for public view
 |  | from | 281 |  |  |
| | | from | 281 | | |
Abstract
Investigation of water quality used in different broiler farms (82 farm) showed increase in some water chemical parameters which associated with sorts of vaccination failure with low antibody titer leading to recurrence of infection .Failure in disinfection as tool of biosecurity program associated bad water quality. Two experiments are conducted to evaluate the impact of water quality on bird immune response against NDV and IB field vaccination and broiler performance indices. Effect of water chemicals on antibacterial activity of selected commercial used disinfectants was determined. NDV vaccine using PBS at 2 weeks old induced highest antibody titer while at 5th week both NS 0.09% and PBS potentiate higher immune response Vs. water with high and low levels of organic matter ( COD). High and low levels of hard water, ammonia, nitrite and chloride affected negatively antibodies production to NDV vaccination at 2 weeks old. Both NS 0.09% and PBS used during vaccination potentiate higher immune response to NDV. Water used for vaccination of IBV with high and low levels of COD, hardness, ammonia, nitrite, chloride, sulphate and phosphate decreased antibody titer from 2nd to 5th week