Table 2.

DSLD-affected horses of other breeds

	age, sex, breed	onset of symptoms	clinical	family affected	legs	patella	heart	PA	aorta	eyes	other tissues	ultrasound
1	18 mo, F thoro	6 mos	rear legs	no	4 mild	ND	ND	ND	+	ND	nuchal+	ND
2	5 y, M Han	16 mo	forelimbs	no	4 severe	ND	Cor +	ND	+	R eye +	nuchal+	front SLs
3	5 y, F, Appal	6 mos	four	sire	4 severe	yes	cor N	ND	+	both+	nuchal, lung +	2/2 hind SLs
4	8 y, M thoro	6 yr	rear legs	sire sudden death	4 mild	ND	ND	ND	+	-	nuchal+	rear legs
5	16 y, M, Arab	unknown	years	no	4 mild	ND	valve+	ND	+	-	-	ND
6	18 y, F quarter,	unknown	rear legs, lung sounds	no	4 mild	ND	cor	ND	+	both+	nuchal, lung +	rear legs

Age: age at necropsy; ND: not done; legs: SDFT, DDFT and SL; cor: coronary artery; PA: pulmonary artery; nuchal: nuchal ligament; Han: Hanovarian; Appal: Appaloosa; thoro: thoroughbred

Mild, mod (moderate), severe: describes the average severity of pathology in examined leg tendons and ligaments; +: accumulation of proteoglycans in other tissues; -: no proteoglycan accumulation