Table 4.
Effects of different protease or phytase on serum physiochemical parameters and digestive enzyme activities in ducks 1.
| Items | CON 2 | PA | PB | PTA | PTB | PTC | SEM 3 | p-Value |
|---|---|---|---|---|---|---|---|---|
| Serum | ||||||||
| Phosphorus, mmol/L | 2.01 a | 1.78 b | 1.85 a,b | 1.91 a,b | 1.95 a,b | 1.98 a,b | 0.10 | 0.04 |
| Calcium, mmol/L | 1.60 a | 1.41 b | 1.46 a,b | 1.55 a,b | 1.52 ab | 1.51 a,b | 0.09 | 0.04 |
| Jejunal digesta | ||||||||
| Trypsin, units/mgprot | 1406.73 b | 2022.20 a,b | 2056.65 a,b | 2766.32 a | 2447.23 a | 2213.54 a | 378.00 | 0.02 |
| Chymotrypsin, units/mgprot | 4.12 b | 4.48 a,b | 4.35 a,b | 6.11 a | 5.02 a,b | 6.38 a,b | 0.97 | 0.04 |
a,b Means in a row with different letter differ (p < 0.05). 1 Means represent 7 pens of ducks with 4 birds per pen (n = 7). 2 CON, basal diet; PA, phytase A; PA, phytase B; PTA, protease A; PTB, protease B; PTC, protease C. 3 Standard error of the means.