Table 2. Effects of different inorganic : organic zinc ratios or combination of low crude protein diet and feed additives on diarrhea scores in weaned piglet diets

Treatment	NC	PC	T1	T2	T3	T4	SE	p-value
Diarrhea score¹⁾
0 to 7 days	1.929	1.701	1.781	1.622	1.741	1.595	0.252	0.947
8 to 14 days²⁾	1.164^a	0.778^ab	0.440^b	0.692^ab	0.464^b	0.833^ab	0.165	0.045
Overall period (0 to 14 days)	1.278	0.982	0.919	0.997	0.908	1.086	0.166	0.635

NC, no additional added zinc oxide in diet (negative control); PC, NC+1,000 mg/kg zinc oxide (positive control); T1, NC + inorganic : organic zinc 850 : 150 mg/kg ; T2, NC + inorganic : organic zinc 700 : 300 mg/kg; T3, NC + inorganic : organic zinc 500 : 500 mg/kg; T4, 10% reduced CP diet + 0.1% essential oil + 0.08% protease + 0.02% xylanase.
Diarrhea score was determined as follow: 0, well-formed feces; 1, normal feces; 2, sloppy feces; and 3, diarrhea.
Contrast: NC vs other treatments ( p < 0.05).
Means in the same row with different superscripts differ ( p < 0.05).