1. Adult Goats Does weigh between 125 to 200 Lbs Bucks weigh between 200 to 300 lbs Adult males are called bucks or Billy's Adult females are called does or a nanny's They live 10 to 12 years , but can live as long as 30 years They eat grass, herbs, tree leaves , grain, and other plant material An adult eats about 7 lbs of food each day Adult goats can be fed once or twice a day.