Search Results - "Leathwick, D.M"

Managing anthelmintic resistance – Use of a combination anthelmintic and leaving some lambs untreated to slow the development of resistance to ivermectin by Leathwick, D.M., Waghorn, T.S., Miller, C.M., Candy, P.M., Oliver, A.-M.B.

“…A field study was conducted to test the hypotheses that use of a combination anthelmintic and/or increasing the pool of unselected worms ‘in refugia’ by…”
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Route of administration influences the concentration of ivermectin reaching nematode parasites in the gastrointestinal tract of cattle by Leathwick, D.M., Miller, C.M., Waghorn, T.S., Schwendel, H., Lifschitz, A.

“…An animal trial was conducted to measure the concentrations of ivermectin occurring in abomasal and small intestinal contents and mucosa, and in the target…”
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Dealing with double trouble: Combination deworming against double-drug resistant cyathostomins by Scare, J.A., Leathwick, D.M., Sauermann, C.W., Lyons, E.T., Steuer, A.E., Jones, B.A., Clark, M., Nielsen, M.K.

“…An alternative control regimen for drug-resistant parasites is combination deworming, where two drugs with different modes of action are administered…”
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Selection for anthelmintic resistant Teladorsagia circumcincta in pre-weaned lambs by treating their dams with long-acting moxidectin injection by Leathwick, D.M., Miller, C.M., Fraser, K.

“…Administration of long-acting anthelmintics to pregnant ewes prior to lambing is a common practice in New Zealand. Today, most of these products contain…”
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The management of anthelmintic resistance in grazing ruminants in Australasia—Strategies and experiences by Leathwick, D.M., Besier, R.B.

“…In many countries the presence of anthelmintic resistance in nematodes of small ruminants, and in some cases also in those infecting cattle and horses, has…”
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Modelling the benefits of a new class of anthelmintic in combination by Leathwick, D.M.

“…Since 2009 two new classes of anthelmintics have been registered for use in sheep in New Zealand. This raises challenging questions about how such new actives…”
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Sustainable control of nematode parasites – A New Zealand perspective by Leathwick, D.M.

“…In many countries the presence of anthelmintic-resistant nematode parasites in sheep flocks is now the norm rather than the exception. Given this, resistance…”
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Efficacy of oral, injectable and pour-on formulations of moxidectin against gastrointestinal nematodes in cattle in New Zealand by Leathwick, D.M., Miller, C.M.

“…The efficacy of moxidectin administered by different routes, against naturally acquired infections of gastrointestinal nematode parasites of cattle, was…”
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Anthelmintic efficacy of single active and combination products against commonly occurring parasites in foals by Morris, L.H., Colgan, S., Leathwick, D.M., Nielsen, M.K.

“…•Reduced efficacy of ivermectin, abamectin, and moxidectin against Parascaris spp.•High efficacy of benzimidazoles, single active, and in combination against…”
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Anthelmintic resistance in equine parasites—Current evidence and knowledge gaps by Nielsen, M.K., Reinemeyer, C.R., Donecker, J.M., Leathwick, D.M., Marchiondo, A.A., Kaplan, R.M.

“…Anthelmintic resistance is becoming increasingly prevalent among equine nematode parasites. The first reports documenting resistance were published in the…”
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The production cost of anthelmintic resistance in lambs by Miller, C.M., Waghorn, T.S., Leathwick, D.M., Candy, P.M., Oliver, A-M.B., Watson, T.G.

“…The economic impact of anthelmintic resistance was investigated in lambs by comparing productivity parameters in groups of animals treated either with a highly…”
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The immune response of sheep to larval challenge with Ostertagia circumcincta and O. ostertagi by Sutherland, I.A. (AgResearch Grasslands, Palmerston North (New Zealand).), Brown, A.E, Green, R.S, Miller, C.M, Leathwick, D.M

“…One of three groups of sheep was challenged twice-weekly with infective-stage larvae (L3) of the sheep parasite O. circumcincta, another with the cattle…”
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The efficacy and plasma profiles of abamectin plus levamisole combination anthelmintics administered as oral and pour‐on formulations to cattle by Leathwick, D.M., Miller, C.M., Sauermann, C.W., Candy, P.M., Ganesh, S., Fraser, K., Waghorn, T.S.

“…•Oral and pour-on combination anthelmintics were compared.•Combination pour-ons showed variable efficacy in the absence of resistance.•Abamectin levels in…”
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Cross infection of Haemonchus contortus between calves and lambs by Waghorn, T S, Miller, C M, Candy, P, Hannaford, R, Leathwick, D M

“…Haemonchus contortus can frequently be found infecting pre-weaned beef calves on sheep and beef farms around the North Island of New Zealand. The purpose of…”
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The production costs of Haemonchus contortus and other nematode parasites in pre-weaned beef calves in New Zealand by Waghorn, T.S., Miller, C.M., Candy, P., Carvalho, L., Meban, J., Green, P., Leathwick, D.M.

“…Haemonchus contortus can frequently be found infecting pre-weaned beef calves on sheep and beef farms around the North Island of New Zealand. The purpose of…”
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Chilling requirements for hatching of a New Zealand isolate of Nematodirus filicollis by Oliver, A-M.B., Pomroy, W.E., Ganesh, S., Leathwick, D.M.

“…•Nematodirus filicollis eggs require chilling to hatch.•Chill units were calculated as the length of storage at temperature below a development threshold of…”
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Corrigendum to: “The production cost of anthelmintic resistance in lambs” [Vet. Parasitol. 186 (2012) 376–381] by Miller, C.M., Waghorn, T.S., Leathwick, D.M., Candy, P.M., Oliver, A-M.B., Watson, T.G.

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Efficacy of the nematode-trapping fungus Duddingtonia flagrans against three species of gastro-intestinal nematodes in laboratory faecal cultures from sheep and goats by Waghorn, T.S, Leathwick, D.M, Chen, L.-Y, Skipp, R.A

“…The ability of the nematode-killing fungus Duddingtonia flagrans to reduce number of infective larvae of three species of gastro-intestinal parasitic nematodes…”
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The effect of diet fed to lambs on subsequent development of Trichostrongylus colubriformis larvae in vitro and on pasture by Niezen, J.H, Waghorn, G.C, Graham, T, Carter, J.L, Leathwick, D.M

“…Contrasting herbage diets were fed to lambs to evaluate their effect on subsequent development of Trichostrongylus colubriformis larvae in faeces and on…”
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Impacts of applied Sclerotinia sclerotiorum on the dynamics of a Cirsium arvense population by Bourdot, G.W, Hurrell, G.A, Saville, D.J, Leathwick, D.M

“…Summary A field experiment was conducted from October 1992 to March 1997 in a sheep‐grazed pasture in Canterbury, New Zealand, to determine the effects of the…”
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