Increasing resistance to multiple anthelmintic classes in gastrointestinal nematodes on sheep farms in southwest England.

ABSTRACT:

Background

Anthelmintic resistance (AR) in gastrointestinal nematodes (GIN) is increasing globally, and farmers are encouraged to adopt sustainable control measures. Haemonchus contortus is increasingly reported in the UK, potentially complicating effective GIN control.

Methods

Faecal egg count reduction tests (FECRT) were conducted on 13 farms in north Devon, England, UK in 2016. Relative abundance of H. contortus was quantified using peanut agglutinin staining and used to estimate faecal egg count reduction percentages (FECR%) using the eggCounts R package.

Results

On average, farms had GIN resistance to three anthelmintic classes. No farms had susceptibility to all anthelmintics tested. AR was more prevalent in 2016 than on the same farms in 2013. H. contortus was

SUBMITTER: Bull K 

PROVIDER: S-EPMC9310741 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature