It seems to be much easier to find local beef from 100% grass fed cows than it is to find local milk from 100% grass fed cows. Do others find this to be the case? I assume grain feeding has same negative health effects on cow and on milk as it does on beef? Is it harder raise a dairy cow on 100% grass? Does adding grain feeding greatly increase milk supply?
I've also heard that some farmers only give grain while the cow is being milked. I assume to keep them calm and in one place. Would this be enough to affect their health and their milk? And couldn't this be done just as effectively with hay instead of grain?
UPDATE: See response below linking to article about Sally Fallon's (WAPF) dairy farm. Great quote from Sally in the article:
“In all of our suggestions on dairy farming, we have allowed some grain to be given to dairy cows–up to 0.5% of body weight per day (we are giving about 0.2% of body weight, thus the cows are getting about two pounds of grain during milking).* There are two reasons for this. First is that in a natural setting, ruminants would be getting some grain in the seed heads of mature grasses. And second, dairy cows are more stressed than cows in the wild, producing more milk than a natural cow would–even low-production cows like our own. If we did not give the grain, the cows would be very very thin. By soaking in vinegar water, we make the grains very digestible for the cows.The vast majority of raw milk producers are giving some grain to their cows. Those who don’t are obliged to charge $12-13 per gallon in order for the farm to be economically viable.”