Table 2.   Effect of dietary energy levels on the reproductive performance in breeding pigeons.

Reproductive performance	Metabolizable energy levels (MJ/kg)					SEM	P-value
	11.60	11.80	12.00	12.20	12.40		ANOVA	Linear	Quadratic
Laying interval (days)	38.04a	37.51a	34.89b	35.14b	35.36b	0.32	<0.001	<0.001	0.024
Fertility rate (%)	90.56	79.63	84.32	87.50	95.83	2.87	0.475	0.375	0.138
Hatchability (%)	82.88	94.44	90.34	88.01	92.68	2.02	0.429	0.366	0.484
38-day laying rate (%)	50.00b	55.56b	88.89a	86.11a	88.89a	4.05	<0.001	<0.001	0.071
42-day laying rate (%)	91.67	86.11	94.44	97.22	100.00	1.69	0.080	0.018	0.400
46-day laying rate (%)	91.67	88.89	97.22	97.22	100.00	1.42	0.068	0.011	0.799

Different lowercase letters indicate statistical significance (P<0.05). SEM, standard error of the mean (n=6).