Table 2. Dietary effects of varying levels of vitamin premix (VP) on egg productivity in laying hens

	Treatments			SEM	p-value
	Control 0.1% VP	T1 0.05% VP	T2 0% VP		Linear	Quadratic	ANOVA
Egg production (%)	83.0a	80.6ab	73.9b	2.260	0.012	0.449	0.032
Egg weight (g/egg)	61.5	61.4	60.3	0.727	0.924	0.229	0.472
Daily egg mass	50.9	48.6	43.8	2.042	0.024	0.300	0.085
Feed intake (g/bird/d)	107.8	107.5	102.5	1.718	0.054	0.285	0.079
Total cracked egg	1	2	41
Mortality (bird)	ND	ND	ND

Mean values with different superscripts within the same row differ significantly at p < 0.05.
ND, not detected.