"At stud" refers to a male animal that has been deemed fit for breeding. While this is a common term among horse breeders, there are several synonyms that can be used to describe a male animal that is available for breeding. These include "standing at stud," "serving at stud," "at breeding," "breeding available," and "available for stud service." Each of these phrases conveys the same message as "at stud" and can be used interchangeably to describe a male animal that is considered suitable for breeding purposes. Whether you are a breeder or someone looking to use a male animal for breeding, these synonyms offer a variety of options to describe the animal's availability.