Table 7.
Effects of microbial phytase on P and Ca balance, ATTD, and STTD of P in high-lysine sorghum, red sorghum, white sorghum, and corn fed to growing pigs, exp. 11,2
| No phytase | 500 FTU1/kg phytase3 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sorghum varieties | Sorghum varieties | Probability, P-value < | ||||||||||
| Item | Corn | High-lysine | Red | White | Corn | High-lysine | Red | White | SEM | Grain | Phytase | Grain × Phytase |
| ADFI, g | 755 | 657 | 688 | 666 | 712 | 599 | 729 | 662 | 49 | 0.061 | 0.581 | 0.619 |
| P intake, g/d | 2.3 | 2.5 | 2.5 | 2.2 | 2.2 | 2.3 | 2.5 | 2.1 | 0.2 | 0.032 | 0.389 | 0.880 |
| Fecal output, g/d | 85.7 | 78.9 | 109.6 | 83.5 | 82.9 | 66.9 | 105.8 | 83.2 | 7.3 | <0.001 | 0.267 | 0.783 |
| P in feces % | 1.7 | 2.2 | 1.7 | 1.9 | 0.9 | 1.6 | 1.1 | 1.2 | 0.1 | <0.001 | <0.001 | 0.581 |
| P output, g/d | 1.3 | 1.4 | 1.7 | 1.3 | 0.7 | 0.9 | 1.1 | 0.9 | 0.1 | <0.001 | <0.001 | 0.423 |
| P absorption, g/d | 1.0 | 1.1 | 0.8 | 0.9 | 1.4 | 1.4 | 1.4 | 1.1 | 0.2 | 0.182 | <0.001 | 0.563 |
| ATTD of P, % | 41.5 | 41.9 | 28.1 | 38.5 | 66.2 | 62.3 | 56.1 | 53.9 | 4.8 | 0.280 | <0.001 | 0.473 |
| Basal EPL4, mg/d | 144 | 125 | 131 | 127 | 135 | 114 | 139 | 126 | 9.3 | 0.061 | 0.581 | 0.619 |
| STTD of P5, % | 47.8 | 46.8 | 33.4 | 44.4 | 72.4 | 67.1 | 61.6 | 60.2 | 4.8 | 0.230 | <0.001 | 0.480 |
| Ca intake, g/d | 2.8 | 2.5 | 2.5 | 2.2 | 3.0 | 2.4 | 3.0 | 2.2 | 0.19 | <0.001 | 0.168 | 0.218 |
| Ca in feces, % | 1.3 | 1.3 | 1.1 | 1.2 | 0.7 | 1.1 | 0.7 | 0.8 | 0.09 | 0.007 | <0.001 | 0.278 |
| Ca output, g/d | 0.9 | 0.8 | 1.1 | 0.8 | 0.5 | 0.6 | 0.6 | 0.6 | 0.07 | 0.070 | <0.001 | 0.311 |
| Ca absorption, g/d | 1.8 | 1.6 | 1.4 | 1.4 | 2.4 | 1.8 | 2.3 | 1.6 | 0.19 | 0.005 | <0.001 | 0.074 |
| ATTD of Ca, % | 65.6 | 64.7 | 56.2 | 62.1 | 81.5 | 74.8 | 79.0 | 73.4 | 3.0 | 0.185 | <0.001 | 0.156 |
1A total of 48 growing barrows (initially 18.6 kg; Line 359 × Camborough; PIC, Hendersonville, TN) were randomly allotted to one of eight dietary treatments in a randomized complete block design with six replicate pigs per diet.
2Data are means of six observations per treatment.
3Phytase: Quantum Blue 5G (5,000 phytase units per gram; AB Vista, Marlborough, UK); FTU = phytase units.
4EPL, endogenous P loss. This value was estimated to be at 190 mg/kg DMI. The daily basal EPL (mg/d) for each diet was calculated by multiplying the EPL (mg/kg DMI) by the daily DMI of each diet (Almeida and Stein, 2010).
5Values for STTD were calculated by correcting values for ATTD for the basal endogenous loss of P (NRC, 2012).