Table 4.

The total number of control and PSSM2/MFM horses of each breed and counts within each denoting the number of horses with zero P variant alleles/loci, one P variant allele or locus or > 1 P variant alleles/loci

	N	No Variants	One Variant Allele/Locus	> 1 Variant Alleles/Loci	% >1 P Variant Allele/Loci	P‐value (allele/locus)
Control‐WB	54	33	18/19	3/2	5.6/3.7
PSSM2/MFM‐WB	68	33	26/28	9/7	13.2/10.3	0.26/0.23
Control‐AR	30	20	9/9	1/1	3.3/3.3
PSSM2/MFM‐AR	30	15	12/13	3/2	10.0/6.7	0.35/0.45

P‐values are given for comparisons of the number of horses with none, one or >1 P variant allele/loci between control and PSSM2/MFM horses by breed.

Abbreviations: AR, Arabian; MFM, Myofibrillar Myopathy; PSSM2, Polysaccharide storage myopathy type 2; WB, Warmblood.