answer:Cow! Heifer is the feminine form of a cow! Cattle is both a plural and a mass noun, but there is no singular equivalent: it is a plurale tantum. Thus one may refer to “three cattle” or “some cattle”, but not “one cattle”. There is no universally used singular equivalent in modern English to “cattle”, other than the gender and age-specific terms such as cow, bull, steer, heifer, and so on. Check this wiki link!