First report of multiple anthelmintic resistance in nematodes of sheep in Colombia
This study aimed to report the presence of parasites resistant to the most used anthelmintic drugs in sheep in Colombia.Four farms (denominated farm 1, 2, 3 and 4) were selected where the animals were not treated with anthelmintics for two months before the trial.Animals with faecal egg count (FEC) above 150 and of different ages were allocated int