Table 1.
Runs of homozygosity (ROH)-based metrics and linkage disequilibrium (LD) values in the 21 purebred and F1 crossbred chicken populations studied.
| Population | Abbreviation Code | Origin | Type | Sample Size | Number of ROHs per Individual | Length of ROH, Kb | F ROH 1 | LD | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | Minimum | Maximum | Mean | Minimum | Maximum | |||||||
| Pure breeds | ||||||||||||
| Amroks Cuckoo | A | USA | dual purpose | 20 | 18.9 ± 1.5 | 3 | 31 | 4057.2 ± 198.8 | 2308.9 | 5998.3 | 0.105 ± 0.009 | 0.187 ± 0.001 |
| Brahma Buff | BB | India, USA | fancy, meat | 20 | 36.6 ± 2.1 | 24 | 56 | 4508.4 ± 194.7 | 3116.2 | 6347.6 | 0.167 ± 0.015 | 0.283 ± 0.001 |
| Brahma Light | BL | “ 2 | “ | 20 | 37.4 ± 3.0 | 10 | 56 | 5259.3 ± 193.4 | 3772.7 | 6916.0 | 0.203 ± 0.017 | 0.286 ± 0.001 |
| Bantam Mille Fleur (or Russian Korolyok) | BMF | Russia | fancy | 20 | 61.2 ± 2.1 | 31 | 78 | 5259.0 ± 234.0 | 4043.3 | 8082.3 | 0.291 ± 0.015 | 0.374 ± 0.001 |
| White Cornish (two-way hybrid C1 bred inter se) | C | England | meat | 20 | 40.4 ± 1.1 | 33 | 52 | 3609.8 ± 80.7 | 3105.0 | 4494.0 | 0.055 ± 0.007 | 0.155 ± 0.001 |
| Frizzle | F | Asia, Europe | fancy | 20 | 5.9 ± 0.1 | 1 | 20 | 3149.0 ± 234.1 | 1394.6 | 6322.4 | 0.023 ± 0.005 | 0.171 ± 0.0003 |
| Hamburg Silver Spangled Dwarf | HSSD | Holland | “ | 20 | 63.9 ± 1.5 | 42 | 76 | 5735.0 ± 164.2 | 4672.2 | 7311.6 | 0.324 ± 0.011 | 0.438 ± 0.001 |
| Light Brown Leghorn (or Italian Partridge) | LLB | Italy | egg | 19 | 47.5 ± 2.3 | 26 | 62 | 3903.8 ± 137.7 | 2949.8 | 5033.0 | 0.167 ± 0.011 | 0.288 ± 0.001 |
| Pushkin | P | Pushkin, USSR/Russia | dual purpose | 20 | 23.8 ± 1.3 | 15 | 36 | 3889.4 ± 209.7 | 2449.5 | 5569.3 | 0.112 ± 0.009 | 0.232 ± 0.001 |
| Russian White | RW1 | Pushkin, Russia | egg | 6 | 68.3 ± 2.0 | 62 | 76 | 5121.9 ± 278.3 | 4279.8 | 5850.7 | 0.307 ± 0.014 | 0.518 ± 0.001 |
| Russian White | RW2 | “ | “ | 170 | 25.9 ± 1.1 | 16 | 36 | 3749.6 ± 111.3 | 2431.3 | 4737.0 | 0.083 ± 0.006 | 0.218 ± 0.001 |
| Sussex Light | SL | England | dual purpose | 20 | 23.1 ± 1.5 | 11 | 35 | 4075.4 ± 155.8 | 3030.5 | 5773.5 | 0.127 ± 0.003 | 0.263 ± 0.001 |
| Tsarskoe Selo (Tsarskoselskaya) | TC | Pushkin, Russia | “ | 20 | 18.6 ± 1.2 | 8 | 30 | 4098.5 ± 193.1 | 2765.8 | 6303.2 | 0.102 ± 0.009 | 0.201 ± 0.001 |
| Uzbek Game | UG | Uzbekistan | game | 19 | 9.0 ± 1.3 | 0 | 21 | 3838.4 ± 349.5 | 0 | 6215.3 | 0.095 ± 0.007 | 0.178 ± 0.001 |
| F1 crossbreds | ||||||||||||
| Brahma Light × Sussex Light | BL × SL | Pushkin, Russia | meat | 12 | 4.3 ± 0.5 | 1 | 7 | 3602.2 ± 378.5 | 2347.8 | 7266.8 | 0.051 ± 0.008 | 0.215 ± 0.001 |
| Sussex Light × Amroks Cuckoo | SL × A | “ | “ | 14 | 2.2 ± 0.3 | 0 | 5 | 2905.1 ± 291.9 | 0 | 5126.7 | 0.033 ± 0.008 | 0.188 ± 0.001 |
| Tsarskoye Selo × Sussex Light | TC × SL | “ | “ | 14 | 6.0 ± 0.7 | 3 | 10 | 3032.8 ± 188.2 | 2050.0 | 4181.1 | 0.040 ± 0.009 | 0.215 ± 0.001 |
| Uzbek Game × Amroks Cuckoo | UG × A | “ | “ | 14 | 4.9 ± 0.4 | 3 | 8 | 3023.5 ± 170.8 | 2062.4 | 4098.3 | 0.039 ± 0.008 | 0.206 ± 0.001 |
| White Cornish × (Brahma Light × Sussex Light) | C × BL × SL | “ | “ | 14 | 0.9 ± 0.3 | 0 | 3 | 1622.8 ± 457.5 | 0 | 4427.7 | 0.024 ± 0.008 | 0.206 ± 0.001 |
| White Cornish × (Sussex Light × Amroks Cuckoo) | C × SL × A | “ | “ | 14 | 1.4 ± 0.4 | 0 | 4 | 1840.6 ± 425.2 | 0 | 4641.6 | 0.033 ± 0.008 | 0.193 ± 0.001 |
| Tsarskoye Selo × (Sussex Light × Amroks Cuckoo) | TC × SL × A | “ | “ | 14 | 3.8 ± 0.6 | 0 | 8 | 2715.2 ± 383.2 | 0 | 5410.2 | 0.046 ± 0.008 | 0.195 ± 0.001 |
1FROH, ROH-based inbreeding coefficient; 2 As above.