Table 4. Growth performance of Korean native ducks fed diets with two levels of crude protein and apparent metabolic energy during 22 to 56 days

		Body weight (g/bird)	BW gain (g/bird)	Feed intake (g/bird)	FCR (FI/BW gain)
Items
AMEn (kcal/kg)	Protein level (%)
3,100	17	2,528.9	2,038.1	5,646.7	2.77
3,100	16	2,574.9	2,010.7	5,937.5	2.95
3,000	17	2,686.9	2,073.2	5,966.8	2.90
3,000	16	2,606.4	2,078.6	5,914.8	2.85
SEM		58.305	53.374	144.74	0.092
AMEn (kcal/kg)
3,100		2,551.9	2,024.4	5,792.1	2.86
3,000		2,646.7	2,075.9	5,940.8	2.87
SEM		41.228	37.741	102.34	0.064
Protein level (%)
17		2,607.9	2,055.7	5,806.7	2.83
16		2,590.6	2,044.6	5,926.1	2.90
SEM1		41.228	37.741	102.34	0.064
Probability
AMEn		0.12	0.35	0.32	0.90
Protein		0.77	0.84	0.42	0.48
AMEn×Protein		0.29	0.76	0.25	0.23

Pooled standard error of the means.