Weight in 7th dayFCR at the end of 1st weekGroupsControl138+4.69b 0.81+0.94aFormaldehyde147+5.16a 0.82+0.03aVirkon S® (1/100 dilution)136+4.02b 0.81+0.07aVirkon S® (1/200 dilution)145+4.39a 0.80+0.05a Weight in 1st day 47.0+3.10ab 50+2.85a 47.7+3.26ab 45.0+3.00b Feed consumption in the 1st week112+5.98b120+8.30a110+6.21b117+7.45a a, b, c: Different superscripts in each row shows th