Intensive Dairy Farming

We are in danger of muddling two things, one of which is the size of the unit. Plenty of farmers have gradually crept up from seven cows to 70, from 70 to 170 and, in my family's case, from about 100 to 400. Is there some cut-off point, above which they should not be allowed to go? That is one of the issues we are discussing. The other issue is whether it is appropriate to be milking cows indoors 365 days of the year. We are in danger of confusing the two issues.