Keeping some chickens is easy. So you always have fresh eggs. For milk you need much more space. A goat is not too bad. And the milk is tasty and creamy, so it is suitable for cream and cheese (and custard or pudding, ice cream...)
And the meat -I've heard claim- can be served as deer. As well as goat it tastes fine. (Exceptan oldbuck.)

Chickens and a goat: a must for the home provider.