Table 3.
Effect of superdosing phytase on egg quality in laying hens1)
| Items | Dietary treatments2) | SEM | p-value | ||||
|---|---|---|---|---|---|---|---|
|
| |||||||
| NC | PC | SD10 | SD20 | SD30 | |||
| Eggshell strength (kg/cm2) | 3.4 | 3.2 | 3.2 | 3.1 | 3.2 | 0.16 | 0.65 |
| Eggshell thickness (μm) | 436 | 428 | 445 | 433 | 433 | 5.40 | 0.15 |
| Eggshell color (Color fan) | 11.8 | 10.7 | 11.2 | 11.4 | 11.0 | 0.39 | 0.33 |
| Eggshell color (Hunter color) | |||||||
| L* | 53.0 | 53.0 | 53.7 | 53.1 | 54.2 | 0.59 | 0.50 |
| a* | 19.7 | 20.0 | 19.7 | 19.3 | 19.0 | 0.40 | 0.24 |
| b* | 25.4 | 25.3 | 25.6 | 25.0 | 24.9 | 0.30 | 0.40 |
| Egg yolk color (Roche color fan) | 7.8 | 7.4 | 7.6 | 8.0 | 7.2 | 0.30 | 0.26 |
| Haugh unit | 96.7 | 97.0 | 98.1 | 97.5 | 98.7 | 1.06 | 0.45 |
SEM, standard error of the mean; FTU, fytase units.
1)
Data are least squares means of 5 observations per treatment.
2)
NC, negative control (0.26% non-phytate P); PC, positive control (0.38% non-phytate P); SD10, NC+10,000 FTU/kg; SD20, NC+20,000 FTU/kg; SD30, NC+30,000 FTU/kg.