Table 1. The basic statistics for phenotypic data

Traits	N	Min	Max	Mean	SD
Total collagen (TC)	129	0.140	1.500	0.362	0.216
Heat insoluble collagen (HC)	129	0.030	1.310	0.250	0.194
Soluble collagen (SC)	129	−0.020	0.310	0.114	0.069