TABLE 1.

Percent of fecal samples positive for Salmonella grouped by treatment and period

Period and treatment	No. of samples tested	No. of Salmonella-positive samples	% Salmonella positive (SE)
Period 1
Continuous tylosin	320	16	5.0 (4.9)
Continuous CTC	320	31	9.7 (1.6)
Pulse tylosin	320	19	5.9 (4.9)
Pulse CTC	320	44	13.8 (6.9)
No antimicrobials (control)	300	8	2.7 (1.5)
Total	1,580	118	7.5 (2.2)
Period 2
Continuous tylosin	319	3	0.9 (0.6)
Continuous CTC	320	11	3.4 (0.7)
Pulse tylosin	320	14	4.4 (2.1)
Pulse CTC	320	30	9.4 (4.2)
No antimicrobials (control)	300	10	3.3 (1.7)
Total	1,579	68	4.3 (1.2)