If a cow isn’t milked her utters will get swollen and cause her pain. We have a symbiotic relationship with cows. They get relief from being milked and we get food. Chickens lay eggs all of the time. It’s their menstruation. Why is it cruel to eat something that naturally occurs? Do you know what a chicken does after it lays an unfertilized egg? She just lets it rot.
All of your facts are simply wrong my dear. Maybe this is why you don’t understand it