Organic Farmers ARE allowed to use antibiotics if the animal is showing no signs of improving from an illness where conventional methods have not been used, they have to get a certificate from the vet and the vet must tend the sick animal.
Believe me, in some cases of pnuemonia and other diseases, prevention IS better than the cure. I have seen sheep and cattle infested with the Fluke worm, not a pretty sight, they cannot shit any thicker than water, and have large jowels below their jaw, and without treatment usually die.
The Soil Association says that the cattle and sheep eat "clover enriched grass", so most of the cattle within the UK that are outside on grass, as most grass re-seeds contain clover mix in them, although to much clover can cause bloating in cattle, so they have to get into the field before the clover is to far established.
Growth Hormones, ah now their is another subject, this is what I am trying to point out, if we get a Free World Trade of Food then you as the public could be eating Meat that has had Growth Promoters put in it, eg Finaplex and others as well.
The best growth promoter for cattle is either grass, or barley or beet pulp, we use a mix of barley and beet pulp for our cattle during the winter as an extra ration with their silage. The weather also contributes to a lot of diseases, the wet mild weather causes pnuemonia of which several violent strains are going about at the moment, fluke in cattle and sheep, because of the wet weather (fluke thrives in wet weather). Many farmers have large amounts of cattle wintering together because of ease of feeding, to save their field from becoming completely gittered up and useless for next year. So in that case we get overstocking of a field, which can lead to worm infestation and other things as well.
One, thing, many of the diseases we are seeing now in farming are becoming more immune to the various antibiotics we are using, apparently these are called super bugs. So the vet says, and the main point of conversation when we are out for the night, "how many of your calves have got pnuemonia and what bottle of stuff are you using this week!!!!!"