Interesting project for someone at college?If a 7-month calf is on high ME haylage plus (say) 1kg daily of a good quality concentrate, I wouldn't be surprised if milk reduces its performance. In other words, it might do better by being weaned.
The cows would be easier kept, and at this time of year, would be less liable to staggers or starvation.
So, has there been any work on how milk affects the utilisation of roughage and concentrates in young growing cattle which can either be derived or not derived of milk.
Should think though the ones still on the cow would do better but that’s just a gut feeling with no information - could be wrong. Our cows are mostly still out with calves on them - we won’t wean till March.