Ask the right questions from your farmers and support the ones whom you can trust.
And in the spirit of asking the right questions, let me share the questionnaire I ask every farmer to fill out before I will list them on my local Texas farms list. I don't think I address 3rd party farm sources. I forget. But this document has no copyright. It may be changed and used as anyone sees fit.
It's unfortunate but true that some farmers are more into the extra money they can get from the "natural," "organic," or "grassfed" labels than they are about actually using traditional techniques to raise animals. So it is really vital to talk with your food producer and have a level of trust with them, whoever they are.
Oh, and really, water sources should be a concern as well, especially for big land animals that come from TX. Our water can contain high levels of both naturally occurring fluorine and selenium, depending on the location. The soil can also be high in selenium, but this is variable. So you may want to ask if any filtration device is used for well water, as well water will be the most likely source. The well water here is very good, but there has been natural gas drilling and coal production all over TX. These processes can contaminate ground water. In fact, I recently ordered a reverse osmosis filter to replace the carbon block I have been using. Better safe than sorry, and I just can't afford frequent testing for all possible contaminants.