She licks him immediately after birth, encoding scent, beginning the bond.
Her colostrum is calibrated specifically for his immune system.
She produces it once. He needs it once.
When calves are allowed to stay, she tracks him from a distance while she grazes. She knows where he is at all times.
When he is taken, she calls for him with a specific vocalisation. This can go on for days.
Her calf is taken within 24 to 48 hours of birth. This repeats with every pregnancy she carries.
She knows everything there is to know about being his mother.
The system decided she wouldn't need to.