Two factors in keeping your cows healhy are fresh air and light. Here we have a Jersey farm in the Netherlands. They made an excellent ventilation system by connecting two barns. Enough fresh air and light for the girls here.
Improvement is often possible by making smart adaptions. Do you have any examples of adaptions that made a difference? Please share them with us!
Note: also, in this video we see horns on the cows. This is possible because of the big straw yard and 8 months of grazing.