This furnace has a cooling system to safely reach higher operating temperatures. This provides increased throughput and an opportunity to reuse some of the excess heat. Power requirements are increased as well.
When enabled a red slider appears. If the total number of animals in this farm gets above the red slider, then the excess number will be slaughtered for products like meat. In case the slider is set to full capacity it will only slaughter the born excess that would not fit into the farm. If slaughtering is disabled, no meat gets produced.
Animals housed in this farm. You can obtain new animals by trading with a world village. Once there are some animals they will start naturally increase in number. Animals need to be provided with food and water otherwise they can perish.