中国的情况不清楚.养鸡使用激素在美国是非法的:

*** Hormone use in poultry production is illegal in the United States ***

参考:

1. "Poultry Industry Frequently Asked Questions".  U.S Poultry & Egg Association. Retrieved June 21, 2012.

2. FDA:  "The Use Of Steroid Hormones For Growth Promotion In Food-Producing Animals"
No steroid hormones are approved for use in poultry.

3. USDA: Hormones & Antibiotics:
/wps/portal/fsis/topics/food-safety-education/get-answers/food-safety-fact-sheets/poultry-preparation/chicken-from-farm-to-table/CT_Index 
No hormones are used in the raising of chickens.

Antibiotics may be used to prevent disease and increase feed efficiency. Before the bird can be slaughtered, a "withdrawal" period is required from the time antibiotics are administered. This ensures that no residues are present in the bird's system. FSIS randomly samples poultry at slaughter and tests for residues. Data from this monitoring program have shown a very low percentage of residue violations.