Table 3.
Analysed chemical composition and analysed enzyme activity of the experimental diets1.
| Item | Treatment2 | Diet3 |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Starter (0 to 14 d) |
Grower (14 to 29 d) |
Finisher (29 to 42 d) |
||||||||
| PC | NC1 | NC2 | PC | NC1 | NC2 | PC | NC1 | NC2 | ||
| Analysed chemical composition, % | ||||||||||
| Dry matter | 87.4 | 87.1 | 87.2 | 87.8 | 87.5 | 87.5 | 89.1 | 89.0 | 88.6 | |
| Ash | 5.4 | 5.4 | 5.4 | 4.8 | 4.7 | 4.6 | 4.8 | 4.8 | 4.7 | |
| Protein | 20.8 | 20.2 | 19.9 | 19.4 | 19.9 | 20.0 | 17.5 | 18.3 | 18.1 | |
| Ether extract | 5.2 | 4.3 | 4.4 | 4.8 | 4.2 | 4.5 | 5.0 | 4.6 | 4.6 | |
| Gross Energy, kcal/kg | 3,982 | 3,912 | 3,917 | 3,982 | 3,896 | 3,931 | 4,004 | 3,965 | 4,011 | |
| Analysed enzyme activity | ||||||||||
| Xylanase, BXU4/kg | -STBIO | <2,000 | <2,000 | <2,000 | <2,000 | <2,000 | <2,000 | <2,000 | <2,000 | <2,000 |
| +STBIO | 22,300 | 21,100 | 22,100 | 20,200 | 16,300 | 21,600 | 15,500 | 18,800 | 18,600 | |
| Phytase, FTU5/kg | -STBIO | 575 | 607 | 847 | 711 | 649 | 568 | 762 | 715 | 603 |
| +STBIO | 667 | 586 | 960 | 817 | 490 | 538 | 585 | 707 | 685 | |
Means were obtained from duplicates.
Treatment: (−) is the control treatment; (+) is the basal diet supplemented with 100 g/t of the stimbiotic, a combination of xylanase and xylo-oligosaccharide (STBIO).
Diet: PC, positive control diet; NC1, negative control 1, with a 50 kcal/kg AME reduction; NC2, negative control 2, with a 50 kcal/kg apparent metabolizable energy (AME) reduction and reducing amino acids by 3%.
One BXU is defined as the amount of enzyme that produces 1 nmol reducing sugars from birchwood xylan in 1 s at 50 °C and pH 5.3.
One FTU is defined as the amount of enzyme required to release 1 μmol of inorganic phosphorus per minute from sodium phytate at 37 °C and pH 5.5.