Table 1.
Number and frequency (%) of individual worm genotypes with “susceptible” and/or “resistant” single nucleotide polymorphisms (SNPs) at codons 198 and 200 associated with benzimidazole resistance in isotype-1 β-tubulin gene of eight Haemonchus contortus populations from goats and sheep in China.
| Populationa (number) | Number of genotypeb and frequency (%)c |
|||||
|---|---|---|---|---|---|---|
| Hs-198, Hs-200 | Het-198, Hs-200 | Hs-198, Het-200 | Het-198, Het-200 | Hs-198, HR-200 | HR-198, Hs-200 | |
| HuB (24) | 16 (66.7) | 4 (16.7) | 2 (8.3) | 0 (0) | 0 (0) | 2 (8.3) |
| HeB (24) | 19 (79.1) | 3 (12.5) | 1 (4.2) | 0 (0) | 0 (0) | 1 (4.2) |
| YN (24) | 0 (0) | 2 (8.3) | 9 (37.5) | 6 (25.0) | 0 (0) | 7 (29.2) |
| SX (24) | 24 (100.0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| GX (24) | 3 (12.5) | 7 (29.1) | 6 (25.0) | 4 (16.7) | 1 (4.2) | 3 (12.5) |
| IM (24) | 2 (8.3) | 1 (4.2) | 0 (0) | 7 (29.2) | 1 (4.2) | 13 (54.1) |
| LN (24) | 7 (29.2) | 5 (20.8) | 4 (16.7) | 2 (8.3) | 0 (0) | 6 (25.0) |
| HLJ (24) | 18 (75.0) | 2 (8.3) | 4 (16.7) | 0 (0) | 0 (0) | 0 (0) |
a
HuB-Hubei, HeB-Hebei, YN-Yunnan, SX-Shaanxi, GX-Guangxi, IM-Inner Mongolia, LN-Liaoning, HLJ-Heilongjiang.
b
Hs = homozygous susceptible; Het = heterozygote; HR = homozygous resistant.
c
Frequency (%) was obtained by dividing the number of genotype by the total number of worms in each population.