Heiffer had calf 4 weeks premature. had to take the calf away to bottle feed it. it has been away from mother for 7 days and is now able to stand can we put him back and will she restart lactation?

Unfortunately, the heifer is very unlikely to accept the calf back at this point. A mother cow bonds with her calf within the first few hours after birth; if this was disrupted, the cow will reject the calf if reintroduced later. Also, if the cow has stopped lactating, she is very unlikely to restart lactation.