Table 8.
ATTD and STTD of Ca and ATTD of DM and P in experimental diets fed to growing pigs1, Exp. 2
| Basal | DCP source2 | |||||
|---|---|---|---|---|---|---|
| Item | A | B | C | SEM | P-value | |
| Feed intake, g/d | 565 | 625 | 739 | 660 | 43 | 0.063 |
| Fecal excretion, g/d | 60b | 74ab | 89a | 80ab | 7 | 0.037 |
| ATTD of DM, % | 88.8 | 86.8 | 87.1 | 87.0 | 1.0 | 0.448 |
| Ca intake, g/d | 3.8 | 4.0 | 4.6 | 4.1 | 0.3 | 0.318 |
| Fecal Ca excretion, g/d | 1.1 | 1.3 | 1.3 | 1.1 | 0.1 | 0.395 |
| Absorbed Ca, g/d | 2.7 | 2.8 | 3.3 | 3.0 | 0.2 | 0.398 |
| ATTD of Ca, % | 71.5 | 68.4 | 71.2 | 72.9 | 2.2 | 0.551 |
| Basal endogenous Ca loss2, mg/d | 389 | 428 | 506 | 451 | 30 | 0.070 |
| STTD of Ca3, % | 81.7 | 79.0 | 82.3 | 83.9 | 2.2 | 0.473 |
| P intake, g/d | 3.3 | 3.6 | 4.3 | 3.7 | 0.2 | 0.079 |
| Fecal P excretion, g/d | 1.5 | 1.7 | 1.9 | 1.7 | 0.1 | 0.194 |
| Absorbed P, g/d | 1.8 | 2.0 | 2.4 | 2.1 | 0.2 | 0.215 |
| ATTD of P, % | 55.7 | 53.1 | 56.1 | 55.1 | 3.0 | 0.893 |
1Each least squares mean for experimental diets from growing pigs represents eight observations, respectively, with the exception for the diet containing DCP source B diet (n = 7); the outlier deviated from first- and third-quartile by 3.2 times the interquartile range within the treatment.
2The daily basal endogenous Ca loss (mg/d) was calculated by multiplying the basal endogenous Ca loss (mg/kg DMI) by the daily DM feed intake (kg/d) of each diet.
3The STTD of Ca in diets was calculated by correcting the ATTD of Ca for basal endogenous Ca loss that was obtained from pigs fed the Ca-free diet (basal endogenous loss Ca loss = 782 mg/kg DMI).