f200y polymorphism of the β-tubulin isotype 1 gene in haemonchus contortus and sheep flock management practices related to anthelmintic resistance in eastern amazon.the objective of the present study was to determine the frequency of the f200y polymorphism in the β-tubulin isotype 1 gene of haemonchus contortus from various sheep flocks in eastern amazon, and to identify management practices that may favor the emergence of resistance to anthelmintic drugs in the same area. in total, 305 specimens of h. contortus were collected from sheep at 12 farms located in the state of pará. an allele-specific pcr was performed to detect the f200y polymorphism, and ques ...201627514894
haemonchus contortus resistance to ivermectin and netobimin in brazilian sheep.suffolk, texel, hampshire down and ile de france sheep from the municipalities of porto amazonas, piraquara and araucaria in the state of paraná, and bagé in the state of rio grande do sul were brought to sobral, state of ceará, to be used in a cross-breeding project. on arrival they had clinical signs of nematode parasitosis, and one suffolk female died. the animals were treated orally with ivermectin (0.2 mg kg-1) and fifteen days later with netobimin (20.0 mg kg-1). neither drug reduced the e ...19921485411
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