I keep goats for their milk so if I do get a couple of orphan lambs it's much cheaper for me to give them goat's milk than buy the powdered stuff. Although it does mean less milk for us. Coming up to lambing time, I tend to freeze any spare so that I have plenty to go round.
I generally milk the goats straight into bottles and give to the lambs while still warm.
My goats only kid every two years and I try to wean them off very quickly. The kids are another problem, not easy to sell and there is now only one abattoir in our area that will take them and even that is a fair distance away.