noun
calf; cattle being reared
Refers to young cattle raised for breeding or meat production, typically from weaning to maturity.
この牧場では育成牛を放牧している。
On this farm, they graze the rearing cattle.
育成牛の健康管理は重要だ。
Health management of growing cattle is important.
肥育牛 are cattle in the fattening stage, whereas 育成牛 are in the earlier growing/rearing phase.
Compound of 育成 (raising, rearing) and 牛 (cattle).