Cows or calves?
They are stressed. Stress aint good. Worst thing for them and drives their immunities down. There's no real way to quantify it since some are more high strung than others.
I'd watch calves really close and if they begin to show signs of respiratory issues, hit them with banamine and nuflour immediately. If one happens to have an ailment that must be treated, fix that too. Other than that, I'd let them all settle with good quality hay and maybe a touch of feed depending on their condition.
When they know you are walking up with a touch of feed, your presence no longer stresses them even more. Eventually they will quit looking to go home and settle in. That is when it is best to work them completely.
Usually - not always - I go through a probation period with mine in a pasture, then move them in with the herd, then I work them. They seem more settled when they are blended into the herd.
Our ancestors gave us this. They fought to make it what it is. All we have to do is defend it.