What is the term for a small pellet or material containing hormones placed in an animal to promote growth?

The term "implants" refers to small pellets or materials that contain hormones and are inserted under the skin of an animal, typically in the ear. These hormone-releasing implants are used in livestock management to promote growth, improve feed efficiency, and enhance overall production. The use of implants is a common practice in the industry, especially with cattle, to achieve desired growth rates and improve meat quality.

The other terms do not accurately describe this specific practice. For instance, "enhancers" is a more general term that may refer to various products that improve performance but does not specifically denote hormone pellets. "Accelerators" and "boosters" imply enhancement of growth or production but lack the specificity that "implants" provides regarding the hormone delivery method. Thus, implants is the precise term used within veterinary and agricultural contexts to describe this growth-promoting approach.