Table 3.

Effect of dietary Ca level on Ca, P, and OC contents in serum and ALP and TRACP activities in serum and tibia of 42-d-old broilers¹

Dietary Ca, %	Serum					Tibia
	Ca content, mmol/L	P content, mmol/L	OC content, ng/L	ALP, King unit/100 mL	TRACP, King unit/100 mL	ALP, King unit/g prot	TRACP, King unit/g prot
0.50	2.24	2.48	14.0	301	14.9b	0.386	3.12
0.60	2.34	2.55	14.6	290	15.8b	0.407	1.13
0.70	2.39	2.63	14.0	266	15.4b	0.498	3.21
0.80	2.28	2.41	14.9	212	17.7ab	0.310	2.98
0.90	2.43	2.50	14.0	211	18.9a	0.292	3.69
1.00	2.47	2.24	13.9	211	17.1ab	0.487	1.67
1.10	2.37	2.17	13.9	138	16.2b	0.300	2.24
SEM	0.172	0.145	0.69	53.9	0.85	0.1419	0.860
P-value
Ca level	0.22	0.28	0.93	0.32	0.048	0.86	0.68
Linear	—	—	—	—	0.006	—	—
Quadratic	—	—	—	—	0.17	—	—

Data represent the means of 6 replicates (n = 6).

Values with different superscript letters within a column differ (P < 0.05).

ALP, alkaline phosphatase; OC, osteocalcin; TRACP, tartrate-resistant acid phosphatase.