Table 1. Effects of different concentrations of nano-ZnOs on the body weight gain of male rats for ten weeks

Groups	Dose (mg/kg)	Initial weight	Final weight	Weight gain
G1	0	161.80±3.55^a	241.60±9.35^a	79.80±8.02^a
G2	100	171.40±5.02^a	161.60±8.07^ab	19.00±6.42^b
G3	200	169.25±9.11^a	170.00±13.49^ab	20.80±3.81^b
G4	300	171.83±4.88^a	151.40±8.90^b	12.20±4.15^b
G5	400	165.20±6.09^a	160.40±10.89^ab	17.00±5.71^b
G6	600	169.80±2.71^a	185.40±9.38^ab	25.20±7.09^b

Data represent the means±SE of 5 animals per group. The difference between mean values with different superscripts in the same column is statistically significant.