Table 6.
Tibia bone ash, Ca, and Pi apparent ileal digestibility (AID) of male broilers as affected by limestone particle size (PS), phytase enzyme, Ca and Pi levels, and their interactions.
| PS1 | Phytase2 | Ca and P3 | Age (D) |
|||||
|---|---|---|---|---|---|---|---|---|
| Bone ash (%) |
Ca AID (%) |
Pi AID (%) |
||||||
| 14 | 35 | 14 | 35 | 14 | 35 | |||
| Main effects | ||||||||
| Fine | 50.0 | 52.5 | 65.1A | 54.8a | 63.9A | 56.5A | ||
| Coarse | 50.3 | 52.6 | 56.1B | 48.4b | 53.4B | 52.1B | ||
| P value | 0.39 | 0.78 | 0.00 | 0.01 | 0.00 | 0.00 | ||
| SE | 0.15 | 0.19 | 1.25 | 1.25 | 1.09 | 0.96 | ||
| 0 | 49.6B | 52.3 | 56.7B | 52.5 | 55.8B | 51.2B | ||
| 1,000 | 50.7A | 52.7 | 64.4A | 50.7 | 61.5A | 57.5A | ||
| P value | 0.00 | 0.11 | 0.00 | 0.28 | 0.00 | 0.00 | ||
| SE | 0.15 | 0.19 | 1.25 | 1.17 | 1.09 | 0.96 | ||
| PC | 50.1A | 52.8a | 52.4B | 49.9b | 56.7b | 48.4B | ||
| NC | 49.4B | 52.2b | 68.7A | 53.3a | 60.6a | 60.2A | ||
| P value | 0.00 | 0.02 | 0.00 | 0.05 | 0.01 | 0.00 | ||
| SE | 0.15 | 0.19 | 1.25 | 1.17 | 1.09 | 0.96 | ||
| Interactions | ||||||||
| Fine | 0 | 49.7 | 52.4 | 69.7A | 55.3 | 63.5A | 53.7 | |
| Coarse | 0 | 49.6 | 52.2 | 43.8C | 49.6 | 48.1B | 48.6 | |
| Fine | 1,000 | 50.5 | 52.5 | 60.5B | 54.2 | 64.3A | 59.4 | |
| Coarse | 1,000 | 50.9 | 52.9 | 68.3A | 47.2 | 58.7A | 55.6 | |
| P value | 0.29 | 0.27 | 0.00 | 0.70 | 0.00 | 0.64 | ||
| SE | 0.21 | 0.27 | 1.76 | 1.66 | 1.55 | 1.36 | ||
| 0 | NC | 48.4C | 52.0 | 66.3 | 54.7 | 57.9 | 57.0 | |
| 0 | PC | 50.9A | 52.6 | 47.1 | 50.3 | 53.6 | 45.3 | |
| 1,000 | NC | 50.3B | 52.4 | 71.1 | 51.8 | 63.3 | 63.4 | |
| 1,000 | PC | 51.1A | 53.1 | 57.7 | 49.6 | 59.7 | 51.5 | |
| P value | 0.00 | 0.78 | 0.10 | 0.50 | 0.82 | 0.93 | ||
| SE | 0.21 | 0.27 | 1.76 | 1.66 | 1.55 | 1.36 | ||
| Fine | NC | 49.3 | 51.9 | 71.8 | 54.5a | 66.6 | 61.3 | |
| Fine | PC | 50.9 | 53.1 | 58.3 | 55.0a | 61.2 | 51.8 | |
| Coarse | NC | 49.4 | 52.5 | 65.6 | 52.0a | 54.6 | 59.2 | |
| Coarse | PC | 51.1 | 52.6 | 46.5 | 44.8b | 52.1 | 45.0 | |
| P value | 0.66 | 0.05 | 0.11 | 0.02 | 0.36 | 0.09 | ||
| SE | 0.21 | 0.27 | 1.76 | 1.66 | 1.55 | 1.36 | ||
Means within each column and treatment effect that don't possess any lowercase superscript letter in common differ significantly (P ≤ 0.05).
Means within each column and treatment effect that don't possess any uppercase superscript letter in common differ significantly (P ≤ 0.01).
Abbreviation: SE, standard error of mean.
Limestone particle size: fine (190 μm) and coarse (900 μm).
Phytase: had a dose of 1,000 FYT/kg and a matrix value of 0.18% for Ca and 0.15% for Pi.
The Ca and Pi had 2 levels, NC (negative control) had Ca 0.72 and P 0.3 in starter and Ca 0.53 and P 0.23 in grower while PC (positive control) had Ca 0.9 and P 0.45 in starter and Ca 0.76 and P 0.38 in grower.