I buy mine from a organic butchers which specify its grass fed, they also have all the farmers details and you can go see their farm or see it onlne and they only are grass fed with no grains.
I also buy organic free range eggs from chickens, which are only grass fed too and also chicken.
It is VERY expensive, however, I would rather cut back on other things and know my food is 'clean' and how nature intended it to be...
Here is some information, if you search the net, you will find lots..
http://www.marksdailyapple.com/welco...#axzz1wVAvwwJA
http://thepaleodiet.com/
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