Table 5.
Effects of increasing the inclusion level of phytase on the apparent prececal amino acid digestibility of corn–soybean meal-based diets fed to growing pigs, % (Exp. 1)1
| BD2 | ||||||
|---|---|---|---|---|---|---|
| Phytase: | 0 | 750 | 1,500 | 3,000 | Pooled SEM | P-value |
| Indispensable amino acids | ||||||
| Arg | 85.3 | 86.2 | 86.4 | 86.5 | 1.0 | 0.291 |
| His | 75.3 | 76.2 | 75.4 | 76.3 | 1.6 | 0.662 |
| Ile | 79.2 | 80.6 | 79.9 | 80.1 | 1.6 | 0.561 |
| Leu | 79.8 | 80.9 | 80.3 | 81.3 | 1.7 | 0.453 |
| Lys | 78.7 | 79.1 | 79.8 | 80.4 | 1.5 | 0.440 |
| Met | 81.3 | 82.0 | 81.8 | 81.7 | 1.7 | 0.928 |
| Phe | 80.1 | 81.6 | 81.2 | 81.8 | 1.5 | 0.283 |
| Thr | 67.0 | 68.3 | 67.3 | 68.3 | 1.8 | 0.628 |
| Trp | 70.5 | 71.6 | 68.4 | 69.4 | 1.9 | 0.223 |
| Val | 75.1 | 76.3 | 75.0 | 75.8 | 1.9 | 0.646 |
| Dispensable amino acids | ||||||
| Ala | 73.5 | 74.6 | 74.2 | 75.1 | 2.1 | 0.681 |
| Asx3 | 73.8 | 75.4 | 75.2 | 76.3 | 1.6 | 0.165 |
| Cys | 66.1 | 66.9 | 65.0 | 66.3 | 1.8 | 0.551 |
| Glx3 | 80.4 | 80.7 | 81.3 | 82.1 | 1.4 | 0.342 |
| Gly | 62.7 | 63.1 | 62.1 | 63.7 | 1.9 | 0.869 |
| Pro | 76.4 | 76.0 | 76.6 | 75.8 | 1.7 | 0.913 |
| Ser | 73.5 | 74.9 | 74.6 | 75.9 | 1.7 | 0.171 |
| Tyr | 79.2 | 80.5 | 79.5 | 80.3 | 1.5 | 0.455 |
1Data are given as LSMeans and pooled SEM (untransformed data).
2Corn–soybean meal-based basal diet.
3Asp, Asn, and Glu, Gln, respectively, were detected together because the side groups of Asn and Gln are lost during acid hydrolysis (Fontaine, 2003).