It doesn’t take much to get a steer’s attention. When Paulo de Meo Filho wants them to eat, all he has to do is stir their feed and they’ll trot over for a few bites. Getting the steers to eat is important because he’s trying to study the impact of diet on the animals’ methane emissions. As the day-to-day operations lead for the research, De Meo Filho has spent months carefully measuring and monitoring the feed eaten by the research steers, housed at a University of California, Davis, feedlot. Different bins hold different feed for the test cattle.