Table 4.

Effects of increasing CaCO₃ on weanling pig growth performance, experiment 1¹

	CaCO3, %2						P =
Item	0.00	0.45	0.90	1.35	1.80	SEM	Linear	Quadratic
BW, kg
Day 0	5.9	5.9	5.9	5.9	5.9	0.02	0.846	0.498
Day 14	8.0	8.0	7.8	7.7	7.7	0.11	0.006	0.641
Day 28	14.7	14.9	14.8	14.5	14.6	0.23	0.397	0.612
Experimental period (days 0 to 14)
ADG, g	149	147	136	129	133	7.2	0.010	0.443
ADFI, g	171	170	170	164	171	7.4	0.676	0.627
G:F, g/kg	864	854	805	783	776	18.8	< 0.001	0.585
Common period (days 14 to 28)3
ADG, g	477	489	498	485	494	14.9	0.331	0.470
ADFI, g	659	682	678	660	669	15.4	0.798	0.424
G:F, g/kg	723	725	730	734	735	10.4	0.182	0.914
Overall (days 0 to 28)
ADG, g	312	314	312	304	311	9.7	0.569	0.954
ADFI, g	413	417	418	408	416	11.1	0.918	0.920
G:F, g/kg	753	751	745	744	745	7.1	0.246	0.736
Fecal DM, %4
Day 10	22.5	22.1	21.9	21.5	24.4	1.1	0.303	0.091

¹A total of 695 weanling barrow pigs (DNA 200 × 400; initially 5.9 ± 0.02 kg) approximately 21 d of age were used in two 28-d experiments with 5 pigs per pen and 27 or 28 pens per treatment.

²Analyzed Ca of the treatment diets were 0.61%, 0.80%, 0.99%, 1.15%, and 1.37%, respectively.

³Analyzed Ca of the common phase 2 diet was 0.89%.

⁴Feces from three pigs from each pen were pooled, weighed, and dried to measure fecal DM.