Table 1. Phenotypes measured in the eight founder strains of the Collaborative Cross.

Trait	No. Samples	Range of Samples per Founder	Figure	h2
Age	248	na	Figure S1	na
Weights
Body	231	19−38	Figure 1A	0.84
Mean testis	218	20−38	Figure 1B	0.71
Mean epididymis + vas deferens	170	12−30	Figure 1C	0.70
Seminal vesicles	217	20−38	Figure 1D	0.51
Histology
Number of tubules	208	17−36	Figure 3A	0.50
Mean tubule radius	208	17−36	Figure 3B	0.57
Seminiferous epithelium length	208	17−36	Figure 3C	0.48
# of tubules with vacuoles	207	16−36	Figure 4A	0.35
# of tubules with many vacuoles	207	16−36	Figure 4B	0.39
# of tubules with germ cell loss	141	12−26	Figure S4	0.15
# of tubules with abnormal germ cells	207	16−36	Figure S4	0.12
# of tubules with germ cell sloughing	207	16−36	na	0.11
Sperm count
106/mouse	171	9−32	Figure 6A	0.38
103/mg testis	159	9−30	Figure 6B	0.27
103/seminiferous epithelium length	152	8−28	Figure 6C	0.22
Sperm morphology
% normal	111	10−19	Figure 7A	0.47
% abnormal head shape	111	10−19	Figure 7B	0.42
% abnormal tail bending	111	10−19	Figure 7C	0.34
% broken tails	111	10−19	Figure 7D	0.07
Sperm motility t = 10 min
% motile	116	10−18	Figure 8A	0.42
VCL	116	10−18	Figure 8C	0.68
% vigorous	116	10−18	Figure 9	0.53
% hyperactive	116	11−18	Figure 9	0.33
Sperm motility t = 90 min
% motile	105	10−16	Figure 8B	0.60
VCL	105	10−16	Figure 8D	0.71
% vigorous	105	10−16	Figure 9	0.73
% hyperactive	105	10−16	Figure 9	0.40
Sperm metabolism
Lactate production	61	4−11	Figure 10	0.29

For each trait, the table lists the total number of mice sampled, the range of samples measured/founder strain, the figure reporting values for that trait and its narrow-sense heritability (h²) as defined in the Materials and Methods. na, not available; VCL, curvilinear velocity.