hybridization of australian haemonchus placei (place, 1893), haemonchus contortus cayugensis (das & whitlock, 1960) and haemonchus contortus (rudolphi, 1803) from louisiana. 19817287298
ivermectin resistant haemonchus contortus in louisiana lambs.fifteen weaned crossbred (suffolk x louisiana native) lambs were treated with albendazole (10 mg kg-1) to remove existing nematode infections. they were inoculated with haemonchus contortus infective larvae from a residual population surviving treatment with the oral formulation of ivermectin (0.2 mg kg-1). one group of five lambs remained untreated, another group of five was treated with the injectable formulation of ivermectin (0.2 mg kg-1), and a third group of five was treated with the oral ...19947725627
validation of the famacha eye color chart for detecting clinical anemia in sheep and goats on farms in the southern united states.recent studies on sheep and goat farms in the southern united states indicate that multiple-anthelmintic resistance in haemonchus contortus is becoming a severe problem. though many factors are involved in the evolution of resistance, the proportion of the parasite population under drug selection is believed to be the single most important factor influencing how rapidly resistance develops. therefore, where prevention of resistance is an important parallel goal of worm control, it is recommended ...200415265575
accuracy of the famacha system for on-farm use by sheep and goat producers in the southeastern united states.famacha is a practical on-farm system designed to provide small ruminant producers a tool for improving their management of haemonchus contortus infections. although this system has become very popular and widely accepted by small ruminant producers in many regions of the southern united states, there is very limited data reported on the effectiveness of the famacha system when performed by farmers. the objective of this study was to evaluate the accuracy of the famacha system for on-farm use by ...200717482368
epidemiology of gastrointestinal nematode parasitism in suffolk and gulf coast native sheep with special emphasis on relative susceptibility to haemonchus contortus eight-year study was conducted to define the epidemiology of gastrointestinal nematode infection in suffolk and gulf coast native (native) breeds of sheep, and to determine if the native sheep is more resistant to infection. for the initial three years, each breed grazed separate pastures where anthelmintic treatments were administered to individual animals on a salvage basis. for the last five years, both breeds grazed concurrently; anthelmintic treatments were administered to individual ani ...19989493310
efficacy of levamisole and netobimin against haemonchus contortus in lambs in louisiana.efficacy of levamisole was evaluated in a suspected levamisole-resistant population of haemonchus contortus in the louisiana state university sheep flock. the efficacy of netobimin also was evaluated against this population of haemonchus. in trial 1, 5 lambs naturally infected with h contortus were given 8 mg of levamisole/kg of body weight as a drench, and 5 lambs were not treated (controls). nematode recovery after slaughter indicated 0% efficacy against h contortus. in trial 2, 30 nematode-fr ...19873662209
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