>I believe for mis-marked you mean with mark signature different from the pure breed style i.e. white stripe on the head.
Yes, we commonly get sheep with white in the wrong places, which we then wouldn't breed from pure. For example, we have a couple this year where the white extends onto the ears, or with white that runs into the wool on the neck. They'll be perfectly good ewes in all other regards, but will sell for "fat" (meat) money rather than as pedigree breeding stock.
> To be milk, that means they should have lamb at foot. Right?
Yes, and I guess the issue with that is that the lambs drink the milk also!!
How long is the milking period for this sheeps? What amount of milk per day do they produce?
I'm not really sure, since we just let the lambs get on with it, and then they gradually wean themselves once they start eating more grass, so I don't know how long they'd milk for if you kept taking it. Zs were originally a Dutch dairy breed, so I would expect them to milk well. I couldn't say if they'd be better or worse than other dairy breeds though.
Actually, I might know more by the end of the current lockdown period, since I have two friendly ewes that had single lambs yesterday. Since milk is the only thing we currently go shopping for, I'm going to ask them nicely if they have some to spare instead!!
> Anyone have any available?
Yes, I expect we will later in the year, and I could also put you in touch with others locally. Just drop me a line once you've done your research and know more about what you're looking for.