Most hog and poultry farms are exactly like this. In fact, usually employees and everyone entering most modern hog barns need to shower in and shower out. Can you imagine doing this just for a tour? If you are looking to learn more about modern pig farming in Indiana, Fair Oaks opened their Pig Adventure to allow folks to see what goes on on a pig farm. A lot of dairies will restrict direct contact with the animals also.
So, why is it a big deal to have visitors? If those visitors have been to another farm or somehow come in contact with an animal disease, they can unknowingly take that to the farm and the animals can get sick. Some farms prohibit visitors that have recently been in a foreign country near farms to come to the farm for a certain amount of time to minimize the risk of transmitting foreign animal diseases that are not found here to their animals.
Keeping animals safe and healthy is the responsible thing to do. Social media makes it easier for farmers to connect with consumers and show them more about what happens on the farm.