Table 2. Average PERV and LTR copy numbers in ten pig breeds.
| Pig breed | Average PERV copy No. (n, Method 1) | Average PERV copy No. (n, Method 2) | Average LTR copy No. (n, Method 1) | Average LTR copy No. (n, Method 2) |
| 1: P-value indicates the comparison result of PERV/LTR copy numbers between Chinese and Western pig breeds by student’s t-test. Number in bold indicates the minimum copy number detected by this method. | ||||
| Western pigs | 49.1±6.5 | 48.2±6.3 | 254.8±30.0 | 204.7±26.7 |
| Duroc | 45.3±6.3 | 44.0±6.2 | 224.5±18.2 | 172.6±16.8 |
| European
wild boar |
43.3±4.5 | 42.5±4.5 | 234.0±10.6 | 192.0±8.8 |
| Landrace | 55.6±4.0 | 54.6±4.0 | 280.9±18.4 | 230.4±16.1 |
| Large White | 46.1±5.0 | 45.7±4.2 | 248.8±21.7 | 197.0±15.0 |
| White Duroc | 51.9±4.1 | 50.7±4.0 | 271.3±29.1 | 219.1±23.0 |
| Chinese pigs | 32.0±4.0 | 32.0±4.2 | 197.8±10.9 | 160.4±13.6 |
| Bama Xiang | 27.8±5.1 | 28.5±5.4 | 198.5±12.7 | 164.0±13.6 |
| Chinese
wild boar |
29.6±3.1 | 29.6±3.5 | 189.9±12.4 | 150.7±18.2 |
| Erhualian | 33.9±2.5 | 33.8±2.5 | 196.5±12.6 | 159.9±11.8 |
| Laiwu | 34.0±2.6 | 33.9±3.4 | 202.0±7.3 | 163.6±11.3 |
| Tibetian | 34.0±2.1 | 34.1±3.4 | 202.4±4.6 | 163.9±12.3 |
| P-value1 | 6.63×10-12 | 7.90×10-11 | 1.01×10-07 | 3.64×10-06 |