Table 4.

Summary of descriptive statistics for traits measured

Trait1	Units	n 2	Mean2	Min2	Max2	SD2
Cell-IR	Log (increase in skin fold thickness, mm)	1,101	0.29	−0.02	0.64	0.10
Ab-IR	Optical density units	1,118	0.70	0.02	2.40	0.41
FT	Time (s)	1,024	0.99	0.33	4.81	0.45
CS	Visual score (1 to 5)	1,147	1.44	1.00	4.00	0.58
WtGain	kg/d	1,118	0.25	−6.16	7.77	1.55

¹Cell-IR = cell-mediated immune responses, Ab-IR = antibody-mediated immune responses, FT = flight time, CS = crush score, WtGain = average daily weight gain during the yard weaning period.

² n = number of animals tested, mean = arithmetic mean, min = minimum, max = maximum.