Comparative evaluation of using coccidiostat drugs versus absence of coccidiostat on coccidiosis control in a broiler grandparent flock and determination of OPG

Nowadays, despite remarkable advances in several areas of poultry production, unfortunately, coccidial infection causes huge annual economic losses, which can lead to disease in any age of poultry in the worldwide. Although, use of coccidiostats is one of common control practices, resistance to these drugs is growing. To evaluate and compare the effectiveness of common occidiostats versus non-use of these drugs, this study was undertaken by litter monitoring of a grandparent flock. Two nests of a house each 3100 day old grandparent chicks selected, raised under same management and diet conditions, except inclusion of coccidiostats. Entire rearing period, samples are taken from litter of each nests, regularly, analyzed by McMaster method to determine litter OPG, weekly. Mean body weight, egg  production, mortality and culls, and total feed consumption for both nesting birds recorded at the end of experiment. Results of this study reveals that, these parameters were the same in both groups. Although, some parameters were better in nonuse of coccidiostats birds due to an autoimmunity.