from what i've seen, there's not enough regulation of irish farms in the sense that i've seen a few farms where the farmer has nothing but contempt for his animals or for any sort of litter laws.
i'm not saying all farmers are like that - far from it - but these fuckers should be clamped down on, and clamped down on hard.
There is plenty of regulation, there are regular herd inspections carried out. I would be interested to know what you would define as contempt for animals... the animals are a farmer's livlihood and I remember times when our cattle were eating better than we were because they took priority. And don't get me started on the subject of litter. If you're talking about stuff in ditches you can be sure it wasn't put there by the farmers, but they're the ones expected to clean it up and pay for the privilidge of dumping it.
I have no idea to be honest. I don't think there was much change in the process on our farm as long as i was helping out (the last probably ten to fifteen years). We were always 100% dairy, as were almost all the farmers i knew/know.
I should also mention, seeing as you said UK farms typically had 90 odd dairy animals, we had between 70-100, and my dad was running it alone unless i was around at weekends or in the summer. Super farms i imagine would have thousands of animals.
Our farm was initially mixed dairy and arable, slowly that became impossible to maintain as we couldn't afford to hire the help necessary to harvest the crops, costs kept going up while prices stayed largely fixed. Then the same happened with dairy. We had a herd of about 100-120 cows, about 60-80 would be milking at any given time.
Before he finally had to give up Dad was in the process of designing and building a mobile milking parlour which would enable the cows to be milked in the field rather than being brought into a collecting yard. Then milk prices dropped again and he decided enough was enough. He sold most of the herd, planted about a hundred acres of mixed forest and is now working for an engineering firm.
Farming on a small scale is not economically viable any more. If we broke even that was a good year. That does mean, sadly, that the quality of the food we are being provided with, the wheat, milk and meat, is going to decrease... but if you want to know who to blame look no further than the mirror. You want cheap bread, cheap meat, cheap milk etc... fine... just don't expect quality. And fruit and vegetables are no better. Pesticides, genetically modified crops and fertilisers are doing just as much damage to the environment as meat production.