It is highly recommended that you use lean grass-fed beef.
Grass-fed beef is far superior to conventional beef for various reasons.
The conventionally fed cow, or factory-farmed cow, will have a varied diet that includes corn, wheat, soy, antibiotics, and supplements intended to help with rapid weight gain. This is called “finishing” as most cows graze on pasture for at least a small portion of their lives. Finishing results in a larger cow that is more “marbled”, or fatty.
According to Jo Robinson founder of http://eatwild.com/ . A feedlot cow can grow to slaughter weight up to a year faster than a cow fed only forage, grass, and hay providing meat that “is so cheap because they’ve done everything to speed growth and lower the cost of feed.” The result of all of this is a cut of beef that is slightly higher in calories and offers lower levels of antioxidants, healthy omega-3 fats, vitamins A and E, and beta-carotene.
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original publication date April, 2017