We have been able to improve livestock production due to their wide genetic diversity. However, looking closely, improvements in productivity have come at a heavy price of increased health issues and nutritional demands.
Selective breeding brings about obvious changes in size, conformation, and yield. Additional physical and behavioral changes accompany selection for any specific trait, and these are sometimes quite unexpected.
Researchers aimed to find out by watching goats at Buttercups Sanctuary for Goats, England, and recording their reactions to photographs of different human expressions. They found that goats prefer people who were smiling.