Development and field application of metabarcoding-adapted mt-ND4 markers shows substantial gene flow and varying local pressures on Haemonchus contortus and Teladorsagia circumcincta populations in the UK.

While these variations were not statistically significant on most individual farms, the regional averages revealed pronounced and highly significant differences, with a p-value < 0.001 for all three tests.

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The results generally show a positive trend, hinting at population contraction or balancing selection.

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