Body sizes and body weight of 87 Hereford at birth, three months old, 6 months old and yearly were measured.

• 对87头移植IVF胚胎生产的海福特肉牛的初生重、3月龄、6月龄和12月龄的体重体尺进行了跟踪测定和生长发育情况观察。