An experiment was conducted to evaluate the effects of diets containing mannans and glucans on diarrhea incidence and pH of the digestive tract organs of weanling pigs. Ninety-six piglets weaned at 24 d (7.7 ± 1.76 kg initial BW) were blocked by initial BW and randomly assigned to 4 treatments with 8 replicate pens per treatment and 3 pigs per pen in a randomized complete block design. Pigs had ad libitum access to feed and water over a 42 d study. The treatments were: PC (positive control diet: 40ppm of colistine sulfate); NC (negative control diet: free of antimicrobial); NC+CA (NC + Compound A: 10% MOS and 18% β-glucan); NC+CB (NC + Compound B: 18% MOS and 20% β-glucan). The inclusion of Compound A was 10 kg/ton and of Compound B was 2 kg/ton. The diarrhea incidence was measured 2 times a day, every day until the 21 d of experiment, using subjective scores according to the consistency and appearance of feces (1 = well-formed, 2 = soft, and 3 = diarrhea). One animal per pen was slaughtered on d 14 of experiment. The pH of the organs contents were measured using a pH meter. Data were analyzed by ANOVA and Tukey’s test (5%), using the GLM procedure of SAS. Higher incidence of diarrhea and also less incidence of well-formed and soft feces were observed for NC (P < 0.01). The pH of the stomach content was lower for NC+CB and PC (P < 0.05), and the pH of the small intestine was lower for NC+CA compared with PC (P < 0.05), but did not differed from NC and NC+CB. In conclusion, feeding diet with no additives results in higher incidence of diarrhea, also treatments NC+CB and PC are able to reduce the pH of the stomach. Table 1. Diarrhea incidence and pH of the digestive tract organs

Item	Treatments				SEM	P-value
NC	NC+CA	NC+CB	PC
pH
Stomach	3.309b	3.278b	2.615a	2.591a	0.1994	<0.05
Small intestine	5.366ab	4.900a	5.310ab	5.763b	0.1988	<0.05
Cecum	5.504	5.230	4.931	5.023	0.1867	>0.05
Diarrhea incidence
Well-formed	6.870b	17.375a	15.000a	15.250a	1.9483	<0.01
Soft	6.000b	10.750a	11.500a	15.000a	1.5889	<0.01
Diarrhea	25.000b	9.250a	11.375a	7.625a	1.6219	<0.01