Table 1.
Egg productivity of high- and low-productivity hens

Item	HEP	PEP	SEM¹	P-values
Initial body weight (g)	2,056.7	2,424.0	99.22	0.114
HHEP (%)	96.43^a	30.36^b	16.33	0.013
Egg weight (g)	64.60^b	67.10^a	0.58	<0.001
Egg mass (g/hen/day)	62.30^a	20.37^b	10.47	0.015
Feed intake (g/hen/day)	122.50	94.01	9.32	0.122
FCR (g feed/g egg)	1.97^b	3.49^a	0.35	0.003

SEM, standard error of the mean.
Means in same rows with different superscripts are significantly different (P<0.05).
HEP, layers with a laying rate of over 80%; PEP, layers with a laying rate of below 50%.
HHEP, hen-house egg production.