Table 3.

Presence of at least one CFU of Salmonella in feces of commercial beef calves supplemented with Lactobacillus animalis and Propionibacterium freudenreichii-based feed additives to reduce Salmonella ^a.

	Presence of at Least One CFU in Feces (d 0–14)				Presence of at Least One CFU in Feces (d 0–28)
Variable	Mean %	SEM	95% CI	p-Value	Mean %	SEM	95% CI	p-Value
Treatment				<0.001				<0.001
Probiotics	22.0	5.9	12.2–36.2		0.2	25.4	0–100
Control	66.8	6.9	51.6–79.1		1.2	91.0	0–100
Study Day				0.009				0.016
d 0–7	58.8	6.5	45.3–71.1		61.1	6.2	48.5–72.4
d 8–14	28.4	8.0	15.3–46.6		28.5	7.8	15.7–45.9
d 15–28					0.0	0.0	0–100

^a Multivariable model estimating the effect of treatment over time on the presence of at least one CFU of bacteria in feces included fixed effects for treatment group and study day and a covariance structure to account for repeated measures at the animal level.