Hi Brier. McDonald's doesn't own or slaughter any cattle, but we can tell you that we use about 70,000,000 pounds of beef per year, which averages out to approximately 190,000 pounds of beef daily. Our hamburger patties all come to us from our supplier, Cargill, in Spruce Grove, AB. The number of cattle slaughtered on a given day may fluctuate based on factors such as demand or the size of the animals. We hope this helps answer your question.