Yes, we raise Satins and Champagne D'Argents for meat and show, and I have Californians and New Zealands in my barn from time to time, mostly because I like to do color breeding experiments.
I added a Cal doe into my Satin breeding stock years ago to improve the Satins' body type and growth rates, and since then I've had Californian-patterned Satins (now called himalayan Satins) in my herd. In AK we don't have a ton of breeding stock available, so many of us use crossbreeding to get improvements in type or new colors into our herds; it just takes a few generations to get back to what's considered "purebred."
Well, I suppose it depends on how you define stress. My adult Cals and himis get smut from severe cold, and also as a result of injuries. Kind of like a black rabbit which gets a cut sometimes grows white hair over the scar, Cals can grow black hair where an injury was (maybe it's just that an injury is exposed and thus not well-insulated?).
Cal kits can also develop color all over or on part of their body if the nest box gets chilled, or if it's particularly humid. It's often called "frosted." Here's a kit that got chilled, or maybe it was humid, I can't remember at the moment; but she grew up to be a perfectly normal himi Satin:
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I've found that Cals very often have those eyebrow markings and little spots hovering around the nose and ear markings. Since they're not disqualifications (DQs), and since color and markings only account for 5 out of 100 points on the show table, most breeders don't work very hard to eliminate them.
So far I haven't found that a hidden REW
c impacts the himi markings very much. Here's Calypso, a
c(h)c Satin. She was martenized - had a dominant tan allele
a(t) at a different place on the genome than the ones for himi/REW - so her feet, ears and nose have silver agouti patterns, but otherwise she was beautifully marked with great color:
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You can see that she also had "eyebrows" and some smut on her hindquarters above her back legs, similar to what you can see on your buck. But she did end up with a little less smut overall, and cleaner markings than my purebred Californians, which are homozygous for himi
c(h)c(h).
Here's Callie, a purebred Californian, with heavy smut on dewlap, eyebrows and around her nose marking:
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And here's another purebred Cal, Wish, in a shot where you can't see the extensive smut on her hindquarters, but you can see how irregular her face markings are, including her "beauty mark" similar to the stray marks on your doe's face. Her dewlap (and its smut) is truly impressive.
But as you can see, she's waiting to have babies, so I don't want to disturb her right now to get a photo of that and her hindquarters:
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However, even though I haven't so far seen clear evidence that being
c(h)c impacts cal markings very much, I am trying to breed
c(h)c Satins, to see if I can have a little less trouble with smut. Since it is relatively cold here most of the year, almost all our good Cals and himi Satins end up with smut on usable arts of the pelt, which is a disqualification for show; while smut on dewlaps or around eyes is not a DQ, that hindquarter smut takes them out of competition. One of my Cals, Toothless, got Best in Show and Reserve Best in Show as a junior, then couldn't ever compete again because she "smutted up."
So, I am hoping that the "dilution" of the himi allele by the REW allele will lighten up the marking tendency a little. You wouldn't want to do it in Arizona, but it might work up here in Alaska!