Table 3.
Blood characteristics of high- and low-productivity hens over time

	Item	HEP	PEP	SEM1	P-values
AM 9
	AST (U/L)	178.70	210.92	13.04	0.212
	ALT (U/L)	4.01b	36.92a	7.36	0.018
	Ca (mg/dL)	28.85	30.60	0.84	0.298
	P (mg/dL)	7.11	9.29	0.72	0.118
	Ca/P	4.10	3.55	0.82	0.264
	TCHO (mg/dL)	166.50	381.10	66.23	0.092
	TG (mg/dL)	1,658.23a	1,292.68b	65.48	<0.001
	LDH (mg/dL)	1,965.08	1,692.28	233.85	0.568
	CRE (mg/dL)	0.35	0.33	0.007	0.334
PM 9
	AST (U/L)	177.77	210.20	10.94	0.127
	ALT (U/L)	4.62	11.05	3.60	0.377
	Ca (mg/dL)	30.11	29.38	0.61	0.558
	P (mg/dL)	7.64	7.59	0.59	0.973
	Ca/P	4.00	4.16	0.80	0.743
	TCHO (mg/dL)	188.95	366.80	67.08	0.178
	TG (mg/dL)	1,431.63	1,409.60	56.90	0.851
	LDH (mg/dL)	893.28a	599.66b	75.43	0.035
	CRE (mg/dL)	0.33	0.34	0.005	0.141

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%.
AST, aspartate aminotransferase; ALT, alanine aminotransferase; Ca, calcium; P, phosphorus; TCHO, total cholesterol; TG, triglycerides; LDH, lactate dehydrogenase; CRE, creatinine.