Autarky is excellent, less additives than most. Not all dogs like it though, and even when you mix it with water you have to build up slowly, keeping an eye on their poo to make sure they aren't getting bound up. I feed my collies 1/2 a ration of Autarky and half a ration of plain wholemeal baked biscuits with Chappie, unless they are working really hard in which case they get a full ration of Wagg Complete (
not the worker version) every other day.
Only when I was working collies on the hill, when I'd be running 12km in the day, goodness knows how much ground the dogs were covering!, only then did I feed Wagg worker - and only then for a few days before a big gather and one day afterwards.
A lot of shepherds around here feed their collies maize. If they have a very big work day, then they may get a tin of Chappie or similar on top.
Collies have been bred to 'do' on very little input - augmented by scavenging, which they love - for many generations, and do well on this diet.
At lambing time they will be working hard, and there will be cleansings about for them to get their extra protein. The rest of the time they love to pick up sheep poo (it's semi-digested vegetables

), lambs' tails and testicles

, any trimmings of foot horn, any removed calves' horns, and will eat a little sheep or cattle cake too if they need a bit more protein.
When I had pet collie crosses, I found they did best on wholebake biscuits and Chappie, with an egg once or twice a week, and not any of the complete feeds, all of which I found to be too high in protein even for very well-exercised and stimulated pet collies. (Once they're adults, I think growing youngsters do need extra protein.)