The ram was one of the most popular sacrificial animals in the Roman world, and were also sacrificed as part of the suovetaurilia; one of the most sacred rites in Roman pagan antiquity. Ram’s would have been part of public ceremonies for events such as blessing the military before battle. Additionally, rams were often associated with fertility and new life, so it is therefore possible that this bronze figurine could have been a votive offering of some kind.
For more information about the meanings of animals in Roman art, see our relevant blog post: Animal Symbolism in Roman Art.