Yes 20 litres is a lot, until you don't have it anymore, and then you think of all the things that you could've done with the milk when you had plenty!!!! One batch of Edam cheese can take 20L nicely, and ricotta... the list goes on and on. Then there's the pigs that you MUST have when she's freshened! You can feed the pigs milk or the skimmed milk once you've gotten the cream, and then you will have lovely pork in about 3 months time! Then there's the clabbered milk that you allow to go sour in a bucket and solidify, and you feed that to your chickens!Then, if you have a freezer you can start freezing milk for the two months or so when the cow is dry! So much milk.. so many things to do with it. The main issue is finding fridge space to store it!
Of course, sometimes with a high producing cow you can get them to produce less, simply by reducing their feed quantity and quality, however, this won't work with some cows, who are just genetically big milkers, and will go down in condition to keep producing the same amount of milk.
Ideally, you should have a cow that provides just the right amount of milk for your purposes and eats accordingly, hence more efficient for your family. I can extol the virtues of Jersey's and in the other corner you will have Vicki spruiking about the wonderful multitasking Dexters!
I know, its all a ways off yet!
Bye for now,