Table 1.

Comparison of duck body weight among the three positions

Days of age	Water curtain end		The middle position		Fan cooling end
	N	BW	N	BW	N	BW
37	161	2.280 ± 0.250a	159	2.260 ± 0.260a	159	2.220 ± 0.240a
43	160	2.530 ± 0.290a	158	2.640 ± 0.300b	158	2.630 ± 0.290b
52	115	2.500 ± 0.300a	145	2.590 ± 0.320a	154	3.200 ± 0.340b
CV	115	12.000%	145	12.360%	154	10.620%
FCR	115	2.700	145	2.640	154	2.100

Note: Values are mean ± standard error; CV means the coefficient of variation at 52 days of age; ^a−b means in each column not sharing a common superscript are significantly different (P < 0.05); FCR means feed conversation ratio at 52 days of age. N represents the number of ducks at different days of age. BW represents the body weight of duck