بسم الله الرحمن الرحيم
It is not lawful to give such an injection to the chicken which contains pork sperm in order to grow them fast. However, if some chicken is injected with the injection then since the component becomes waste and extinct, thus it shall be lawful to eat such chicken.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.