Table 5. Effects of different inorganic : organic zinc ratios or combination of low crude protein diet and mixed feed additives on organ weight in weaned piglets

Treatment	NC	PC	T1	T2	T3	T4	SE	p-value
Body weight (kg)	10.0	10.1	10.3	10.6	10.7	10.0	0.2	0.399
Relative organ weight (%)
Liver	3.046	2.922	2.844	2.709	2.837	2.760	0.211	0.892
Spleen	0.205	0.282	0.231	0.208	0.268	0.214	0.026	0.257

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 crude protein diet + 0.1% essential oil + 0.08% protease + 0.02% xylanase.