Farm animals have certain behavioral tendencies that result from the evolutionary history of these species  By imposing on these animals a type of organization that conflicts with their behavioral tendencies, current farm-management practices cause the animals more pain and distress than do practices that more closely conform to the animals' behavioral tendencies
Because the animals tend to resist this type of organization, current practices can also be less efficient than those other farm-management practices
In order to create farm-management practices that cause less pain and distress to farm animals, a significant loss of efficiency will be required.