On basis your asking, three dominant factors should be determined before injecting and selling Chicken 1. Breed 2. Age 3. Body weight. Hormones are conducted for promoting growth but completely out of orders with antibiotic synergism for selling. To inject in thigh muscle of chicken, schedule of injections should be strictly followed along with its safety margin and withdrawal period. Scrutinized monitoring is very essential to examine titter level of blood ensuring for removal of antibiotic residues before 12hrs of selling. Now considering safety margin and withdrawal period, it is safer to inject combined antibiotic such as Zentamycin+ Sulphadimidine+Trimethoprime preparations than others, manufactured from registered pharmaceutical company of veterinary products. This combined preparations should be administered only for those flock which are suffering immune suppressive disorder and chronic illness. Please don't inject to sound, stout and immune responsive flock of chickens considering food safety and public health significance.

Thanks for your answer..I want to make research about the antibiotic that injucted to chicken that imported in iraq

Industrial poultry production does not use hormones at all. It is just a myth that broilers are treated with growth hormones. Antimicrobials are another thing, but it depends of your approach. In terms of antimicrobial resistance, it does not make sense to look for antibiotic residuals in chicken meat. Instead, you should look for bacteria caring AMR genes or with AMR phenotype. It also depends of the country, but in general terms, do not think about antimicrobials that are injected individually since this is not a practical approach to treat broilers.