Eating grass provides better nutrition for the cattle, and the meat ends up with more nutrition such as omega 3s. https://www.mayoclinic.org/diseases-condition

Eating grass provides better nutrition for the cattle, and the meat ends up with more nutrition such as omega 3s. https://www.mayoclinic.org/diseases-conditions/heart-disease/expert-answers/grass-fed-beef/faq-20058059 https://www.mayoclinic.org/diseases-conditions/heart-disease... In a feed lot, cattle are fed a diet that practically requires antibiotics to keep them alive long enough to slaughter.