Here is what I found. I don't know about cashmere goats, but a C type pygora can be combed or sheared, depends on the coverage and that goats tendency to shed. (some shed more readily than others.) I got this from : http://home.earthlink.net/~fibergoat/id12.html
The amount of Cashmere a goat produces depends on a number of factors, the most important of which is how much selective breeding is in the genetic background. The amount of down produced depends on the diameter, the length of the fiber, and the overall fleece coverage. The cashmere fiber is the goat's winter coat. Its growth is responsive to light. It begins to grow around the summer solstices (June 21st) and ends around the winter solstices (December 21st). Shearing takes place from December to March, the time period when the goat naturally begins to shed its winter coat.
Harvesting is by either shearing or combing. Small herds can be combed to recover the fleece, but with larger herds it is more economical to shear the goats.
Alyssa, Yes all I use is a dog undercoat comb to comb them out The way I tell if they are ready to start being comb, if you pet them and you just gently pull a little and the fiber comes out, then you can start combing.
I have some does that start to lose the fiber in Jan and others that are as late as April. There is a lot of different reason that they lose it. The main reason is kidding. I have a doe that will start to lose her fiber about a week before she kids. It makes it nice, I am able to save the fiber from getting ruined from the kidding process, and I get to know when they are about to kid.
The Cashmere goats have Spanish meat goat ancestry. Most goats, other than Angoras, will produce an underdown, if this underdown fiber is long enough and fine enough it can be considered cashmere producing goat.
The history of the Cashmere producing goats can be traced to Asia, Australia, etc. originally being wild or feral goats that produced the heavy under coat as natural protection to the elements.
Then as the fiber became popular, those goats that produced the fiber were domesticated and bred to other goats that produced a long dense under coat.
Due to the Spanish influence the Cashmeres are also raised for meat as well as fiber.
I have washed my buck while he had his cashmere coat and it hasn't matted up....I brushed him after I rinsed him and while he was damp. I didn't let him go back out with the herd until he was dry. I don't plan to use it since he doesn't have enough to do anything with but that is a great thing to know Sweetgoats, thanks!