Table 3.

Diarrhea incidence of pigs fed diets with either antibiotics or increasing levels of BA¹

		BA, %				P value
Item	PC2	0.00	0.50	1.00	SEM	PC vs. 0.00	Linear3	Quadratic4
Phase 1 (days 0 to 7)	35.9	33.5	39.1	30.1	13.0	0.623	0.450	0.147
Phase 2 (days 7 to 15)	24.9	33.5	31.2	25.2	11.9	0.237	0.253	0.734
Overall (days 0 to 15)	29.7	32.9	31.1	27.0	13.4	0.556	0.289	0.787

¹The experimental unit was a pen, consisting of 8 pigs per pen, and each least squares mean represents 15 observations.

²PC = a basal diet with antibiotics (chlortetracycline at 100 mg/kg [450 mg/kg of Aureomycin 100] during phases 1 to 3, and tylosin at 44 mg/kg [200 mg/kg of Tylan 100] during phases 4 to 6).

³Linear = linear effect of increasing levels of BA.

⁴Quadratic = quadratic effect of increasing levels of BA.