Table 1.

Significance tests for fixed sources of variation for growth traits in preweaned calves and feedlot cattle by type of bovine respiratory disease (BRD) measurement used

Item1	n	Preweaned calves–model fixed effect2
		TRT	CG	Sex	BWT	AgeW	BoDam
BRD incidence
Weaning weight	954	0.35	<0.01	<0.01	<0.01	<0.01	<0.01
NoTrt
Weaning weight	954	0.77	<0.01	<0.01	<0.01	<0.01	<0.01
		Feedlot cattle–model fixed effect3
		TRT	CG	SD(CG)	Sex	DelWt
BRD incidence
Acclimation ADG	3,244	<0.01	<0.01	<0.01	0.01	<0.01
On-test ADG	3,189	0.72	<0.01	<0.01	<0.01	<0.01
Overall ADG	3,189	<0.01	<0.01	<0.01	<0.01	<0.01
Final BW	3,206	<0.01	<0.01	<0.01	<0.01	<0.01
NoTrt
Acclimation ADG	3,244	<0.01	<0.01	<0.01	0.01	<0.01
On-test ADG	3,189	0.68	<0.01	<0.01	<0.01	<0.01
Overall ADG	3,189	<0.01	<0.01	<0.01	<0.01	<0.01
Final BW	3,206	<0.01	<0.01	<0.01	<0.01	<0.01

¹BRD incidence = untreated (100) vs. treated (200), NoTrt (number of treatments): 100 = nontreated cattle, 200 = cattle treated once, 300 = cattle treated twice, 400 = cattle treated 3 or more times; acclimation ADG = early feeding period; on-test ADG = late feeding period; overall ADG = total feedlot period; and final BW = last BW before slaughter.

²TRT = BRD incidence or NoTrt; CG = contemporary group; sex = bull, steer, or heifer; BWT = BW at birth; AgeW = age of calf at weaning time; BoDam = breed of dam.

³TRT = BRD incidence or NoTrt; CG = contemporary group; SD(CG) = final slaughter date within contemporary group; sex = steer or heifer; DelWt = BW upon delivery to feedlot.