Goats can eat any kind of vegetation, but if you have access to quality pastureland with lots of grass, or artificial feed, cattle are much more productive. Cows are big. That makes them difficult to handle at times, but there are fewer animals to milk and provide vet care for. Beef and cow leather are much more highly valued than those products from goats.
Chickens are ridiculously productive and well adapted to confined spaces. Domestic ducks lay nearly as many eggs, it is possible that they could be bred to be as tolerant of confinement as chickens. But ducks need water to clean themselves, while chickens clean their feathers with dry soil. In modern times it is possible to keep ducks indoors and use pesticides to kill feather mites, but chickens have more improved breeding because that wasn’t possible in the past.
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