. 2020 Mar 20;99(5):2375–2384. doi: 10.1016/j.psj.2020.01.013

Table 3.

Comparison of performance traits in male and female ducks.

Categories	Male pekin duck		Female pekin duck
Categories	Mean	SD¹	Mean	SD
General Traits
Average body weight at day 21, kg	1.25^B	0.18	1.27^A	0.20
Average body weight at day 42, kg	3.41^A	0.22	3.24^B	0.18
Body weight gain, kg	2.15^A	0.23	1.97^B	0.22
Daily body weight gain, kg/D	0.11^A	0.01	0.10^B	0.01
Feed intake, kg	5.43^A	0.66	5.29^B	0.64
Residual feed intake, kg	-0.10^B	0.45	0.10^A	0.44
Feed conversion ratio	2.53^B	0.22	2.69^A	0.23
Feeding behavior traits
Total feeding time, min	221.35^a	49.17	219.41^a	47.57
Daily feed intake, kg/D	0.27^a	0.03	0.28^a	0.03
Meal feed intake, g	35.49^A	7.10	34.68^B	6.78
Visit duration, s	72.61^a	18.04	70.72^b	16.98
Meal duration, s	85.59^a	22.53	84.08^a	22.08
Average interval between meals, min	181.97^A	37.27	176.37^B	34.80
Daily feeding rate, g/min	25.74^a	5.25	25.59^a	5.11
Number of meals per day	7.99^B	1.53	8.22^A	1.56
Number of visits per day	9.42^B	1.95	9.77^A	2.10

^A,B,a,bDifferent letters in the same row mean significant differences between different groups. Capital: P < 0.01; Lowercase: P < 0.05.

SD, standard deviation.