Table 2.

Calcium carbonate titration with or without ZnO diet composition¹

		No ZnO					Added ZnO
Item	CaCO3:	0%	0.45%	0.90%	1.35%	1.80%	0%	0.45%	0.90%	1.35%	1.80%
Corn		52.50	52.05	51.60	51.15	50.70	52.10	51.65	51.20	50.75	50.30
Soybean meal		15.60	15.60	15.60	15.60	15.60	15.60	15.60	15.60	15.60	15.60
Whey powder		20.00	20.00	20.00	20.00	20.00	20.00	20.00	20.00	20.00	20.00
Enzymatically treated SBM		5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00
Fish meal		2.50	2.50	2.50	2.50	2.50	2.50	2.50	2.50	2.50	2.50
Bovine plasma		2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00
Calcium carbonate		---	0.45	0.90	1.35	1.80	---	0.45	0.90	1.35	1.80
Monocalcium phosphate		0.80	0.80	0.80	0.80	0.80	0.80	0.80	0.80	0.80	0.80
Salt		0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30
L-Lys-HCl		0.40	0.40	0.40	0.40	0.40	0.40	0.40	0.40	0.40	0.40
DL-Met		0.19	0.19	0.19	0.19	0.19	0.19	0.19	0.19	0.19	0.19
L-Thr		0.18	0.18	0.18	0.18	0.18	0.18	0.18	0.18	0.18	0.18
L-Trp		0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.03
L-Val		0.09	0.09	0.09	0.09	0.09	0.09	0.09	0.09	0.09	0.09
Vitamin premix with phytase2		0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25
Trace mineral premix		0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
Zinc oxide		---	---	---	---	---	0.40	0.40	0.40	0.40	0.40
Total		100	100	100	100	100	100	100	100	100	100
Calculated ABC-4, meq3		316	398	481	563	645	403	486	568	650	733

A total of 10 diets were formulated to contain increasing levels of calcium carbonate with or without 3,000 ppm of Zn from ZnO. Diets without ZnO contained 110 ppm of Zn from the trace mineral premix. Calcium carbonate was added to the diet at the expense of corn. Diets were formulated for pigs weighing 5.0 to 7.0 kg of BW.

Ronozyme HiPhos 2700 (DSM, Parsippany, NJ) provided an estimated release of 0.13% STTD P with 750 FTU/kg.

Individual sample acid-binding capacity-4 (ABC-4) values were used for calculations and not ingredient mean values (Lawlor et al., 2005).