Table 8.

Results from a multivariate GLM¹ modeling 28-d average daily grain consumption in 3 field trials (ranches A, B, and C) evaluating the efficacy of feeding a colostrum supplement in milk replacer for 14 d to preweaned calves (n = 235)

Variable	Level	LSM estimate,2 kg	P-value	90% CI3
				Lower	Upper
Treatment group4	CS	0.22	<0.01	0.19	0.24
	PS	0.21	0.02	0.19	0.23
	UC	0.17	Reference	0.15	0.19
Serum IgG category5	FPT	0.16	<0.01	0.12	0.19
	PFPT	0.22	0.58	0.20	0.23
	APT	0.23	Reference	0.21	0.24
Weight category6	Low	0.17	<0.01	0.15	0.19
	Mid	0.20	0.20	0.19	0.22
	High	0.22	Reference	0.20	0.25
Calf ranch	A	0.28	<0.01	0.26	0.30
	B	0.21	<0.01	0.19	0.23
	C	0.10	Reference	0.08	0.13

¹F-value = 20.17; df = 8; P < 0.0001; and R² = 0.42.

²Least squares mean estimate.

³CI = confidence interval.

⁴CS = colostrum supplement (70 g of dried colostrum powder) added to milk replacer; PS = placebo supplement (70 g of nutritionally matched supplement without IgG) added to milk replacer; UC = unsupplemented control.

⁵FPT = failure of passive transfer: IgG ≤350 mg/dL; PFPT = partial failure of passive transfer: IgG between (and including) 351 and 999 mg/dL; and APT = adequate passive transfer: IgG ≥1,000 mg/dL.

⁶Low: ≤38.5 kg; mid: between 38.6 and 45 kg; high: ≥45 kg.