producing a child or young animal for the first time, or having produced only one child or young animal

The sample consisted of children of primiparous mothers recruited while receiving prenatal care. 样本由在产前护理期间纳入研究的初产母亲的孩子组成。

There are two ways to help primiparous cows: early breeding and early weaning. 有两种办法帮助初产母牛：早育种、早断奶。