Errrrr, barns are to to keep the elements off the animals, rain sleet or snow and a place to keep milk cows in one place to be able to milk them. Barns are to shelter the animals in bad weather and a place to keep in one area, horses within reach not have to chase them down in a pasture. Chickens have coops to lay their eggs and escape from enemy's. Hogs have their pens to retreat to when they wish or need to go to.
Wooden barns even with all kinds of problems of missing siding and a few holes in the roof, fill up with the body heat the animals put out. In time of power outage people will move into the barn for the warmth.
The heat generated in a barn full of these critters is high, their crap will steam adding more heat.
Building a barn made of steel siding needs allot of vents, fires start in stored hay that is kept enclosed, the heat from below will cause the hay to become a prime fact of combustible material.
Animals spend allot of time in a barn, to be enclosed with limited air flow is to cause them to become ill.
Were I to want to build a barn, it would be of wood, not of a air tight material.
We do not build our own homes of air tight materials, few live today in a metal Quonset hut. Those that did in the past had plenty of windows to keep the air flow active.