“多产的”用英语怎么说？

他们都是多产的饲养员，养的母鸡很多都可以下6个蛋之多。They are prolific breeders, with many hens laying up to six eggs.他是个非常多产的作家。He is a stupendously swift writer.他真是一位多产的小说家.He is really a fruitful novelist....