Infections with trichostrongylid worms are common and a major cause of production loss in small ruminants worldwide. In Australia, infections with Haemonchus contortus and Trichostrongylus spp cost the Australian sheep industry up to AUD$369 million annually. Currently, the control of these two parasites relies heavily on the use of anthelmintics and grazing management. However, the frequent use of drugs resulted in widespread development of anthelmintics resistance in many trychostrongylid species including H. contortus and Trichostrongylus spp. Monepantel (Zolvix®, Novartis, Australia), an amino-acetonitrile derivate, is one of the most recent anthelmintics released in Australia and it proved to be active against strains of H. contortus and Trichostrongylus spp that are resistant to broad-spectrum anthelmintics. However, lack of efficacy of monepantel against Teladorsagia circumcincta and T. colubriformis was recently reported in New Zealand and Australia. In this trial, the efficacy of monepantel in sheep and goats naturally infected with H. contortus and Trichostrongylus spp was assessed by faecal egg count reduction tests (FECRT) and total worm counts (WC).
A significant amount of Queensland’s sheep and cattle production is based in the semi-arid central western and north western Mitchell Grass Downs Bioregion where native grasses predominate. Unlike southern Australia, few if any sown pasture legumes have been successfully incorporated in to these regions yet there are severe annual dry season protein droughts and generally the diet on offer is of poor quality resulting in less than ideal sheep and cattle production. The predominant grasses in the region are the native 3P Astrebla species (Mitchell grasses) and the annual Iselima species (Flinders grass). Both are highly regarded by graziers because of their adaptation to the harsh climate and edaphic environment. Both grasses respond and grow rapidly in the short wet season but their nutritive quality then quickly deteriorates as they mature into the long dry season. An adapted legume would potentially have a positive impact on sheep and cattle production as legumes have done elsewhere by providing a higher quality diet throughout the growing season and particularly when the native grass species are haying off into the dry season. Desmanthus is a Mimosaceae legume that has been evaluated for this region and recently a blend named Progardes Desmanthus has been released. It has a crude protein content of some 20% in leaf, 10% in stems and upto 30% in seeds. They are palatable legumes and compatible with the native grasses and like the native grasses they are also well adapted to the climate and edaphic environment of the region. These legumes have significant potential to enhance sheep and cattle production in the Mitchell Grass Downs Bioregion and other similar environments.
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