I do hope people here are trying to mostly eat grass-fed meat:

Antibiotics and the Meat We Eat
http://www.nytimes.com/2013/03/28/opinion/antibiotics-and-the-meat-we-eat.html

Or at least some of the drug-free ones. There are vendors like 
Naturewell beef that stop all growth hormones and antibiotics 120 
days before slaughter. But those are still grain-fed.

All chickens are grain-fed. A very small amount of pastured heritage 
turkey is available from Texas. I have only found two places that 
pasture-feed pork. Though you can get feral pork from Texas.

This is the time of year that legs of lamb from Australia are on sale 
at large supermarkets. All lamb from there is grass-fed. I have been 
stocking my chest freezer with them.

Don.