Table 4.

Allele frequencies for MFSD12 c.600dupC. Eight additional breeds as well as a random sample set of Shetland Ponies were screened for the causal mushroom variant and allele frequencies are reported here.

	Genotype
Breed	N/N	N/Mu	Mu/Mu	Sample Size	Frequency 3
Shetland Pony 1	143	24	10	177	0.12
Miniature Horse	124	5	0	129	0.02
Icelandic Horse	29	0	0	29	0
Belgian	33	0	0	33	0
Rocky Mtn Horse 2	59	0	0	59	0
Friesian	32	0	0	32	0
Arabian	35	0	0	35	0
Quarter Horse	32	0	0	32	0
Thoroughbred	31	0	0	31	0

¹ Random population of Shetland Ponies. ² Rocky Mountain Horse. ³ Allele frequency for MFSD12 c.600dupC.