Chinchilla
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Not sure if those of you on here who are into colours/genetics are aware already, but there is now a test for Mushroom dilution in Shetland ponies https://www.vgl.ucdavis.edu/services/horse/MushroomDilution.php
And this is the study that found the autosomal recessive mutation responsible https://pag.confex.com/pag/xxvi/meetingapp.cgi/Paper/31505
Exciting
And this is the study that found the autosomal recessive mutation responsible https://pag.confex.com/pag/xxvi/meetingapp.cgi/Paper/31505
Exciting