@I Love Layers - I thought this link was pretty helpful: http://www.freewebs.com/thecochincoop/preparingshowbirds.htm
Other breeders also recommend probiotics (plain yogurt) once a week, along with grains and black oil sunflower seed for added fat and shiny feathers. Some breeders of yellow-legged varieties also talk about feeding increased amounts of beta carotene, like marigold oil, to improve leg color. Not sure if or how that could affect the feather color on light varieties like White, Splash, or Self Blue though.
The rarity of the birds is a matter of opinion I suppose. There are several breeders offering Blue Cochin eggs on Ebay and one who has Frizzle Blue Cochins right now, so they are definitely obtainable. There is a very good chance though that the the variety is rare or hard to find locally in your area. I know of only one other breeder who has the same variety as I do in our area, so Blue Mottled Cochin bantams could be considered "rare" in my neck of the woods. Plus, good quality show birds are on the rare side no matter what the breed or variety, so being show quality will likely add to the rarity of your new birds as well.
Other breeders also recommend probiotics (plain yogurt) once a week, along with grains and black oil sunflower seed for added fat and shiny feathers. Some breeders of yellow-legged varieties also talk about feeding increased amounts of beta carotene, like marigold oil, to improve leg color. Not sure if or how that could affect the feather color on light varieties like White, Splash, or Self Blue though.
The rarity of the birds is a matter of opinion I suppose. There are several breeders offering Blue Cochin eggs on Ebay and one who has Frizzle Blue Cochins right now, so they are definitely obtainable. There is a very good chance though that the the variety is rare or hard to find locally in your area. I know of only one other breeder who has the same variety as I do in our area, so Blue Mottled Cochin bantams could be considered "rare" in my neck of the woods. Plus, good quality show birds are on the rare side no matter what the breed or variety, so being show quality will likely add to the rarity of your new birds as well.