I will be cross posting this to both goats & cattle.
We do an extended lactation with our cows & then give the one milking a break (& get her bred) & milk the other for a couple of years, then get her bred. That is why we have more than one cow.
A cow will give the most milk after calf #3. Yet this article says with their goats, they only breed them once. I wonder how that compares.
You would never get to leave home without a relief milker and I wonder if he has to milk twice a day. We usually milk once a day. For our present cow, we are doing twice/day.
One thing to note is that udder care is important. He does not use a machine, he milks by hand. A machine is always going to be harder on an udder.
I am sure quality of feed comes into play too.
Someone is trying this with their dairy sheep too.
It would be interesting to learn more of his actual routine & practices with his goats.