Table 4.
Evaluation of calculated vs. analyzed acid-binding capacity-4 on increasing calcium carbonate with or without the presence of ZnO1
| No ZnO | Added ZnO | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Calcium carbonate: | 0% | 0.45% | 0.90% | 1.35% | 1.80% | 0% | 0.45% | 0.90% | 1.35% | 1.80% |
| Calculated ABC-4 (meq) | 316 | 398 | 481 | 563 | 645 | 403 | 486 | 568 | 650 | 733 |
| Analyzed ABC-4 (meq)2 | 287 ± 11.5 | 333 ± 23.1 | 353 ± 23.1 | 393 ± 11.5 | 460 ± 20.0 | 287 ± 11.5 | 340 ± 20.0 | 433 ± 11.5 | 493 ± 11.5 | 600 ± 20.0 |
| Difference3 | 29c | 65c | 128b | 170a | 185a | 116b | 146ab | 135b | 157ab | 133b |
A total of 10 diets were analyzed in a 2 × 5 factorial design with increasing levels of calcium carbonate at the expense of corn with or without 3,000 ppm of Zn from ZnO. Each diet was sampled and analyzed three times.
Analyzed acid-binding capacity-4 (ABC-4) values are reported as the diet average from three samples ± standard deviation within diet (Lawlor et al., 2005).
ZnO × calcium carbonate interaction (P = 0.015). Dose effect of calcium carbonate when ZnO not included at pharmacological levels, linear P < 0.001. Dose effect of calcium carbonate when ZnO included at pharmacological levels, linear P = 0.175. Main effect of calcium carbonate (linear, P < 0.001). Main effect of ZnO (P = 0.009). SEM = 9.9.