RESUMO
OBJECTIVE: To determine the duration of efficacy of a 4% deltamethrin-impregnated collar for dogs (Scalibor® ProtectorBand, MSD Animal Health) against adult female paralysis ticks (Ixodes holocyclus). PROCEDURES: A controlled pen study was conducted. Dogs were artificially infested at 14-day intervals with unfed adult female ticks for up to 140 days following application of the collar to the dogs. Efficacy was assessed by manually counting ticks on dogs at 24, 48 and 72 h after each infestation. RESULTS: Efficacy at the 72-h count was 96% after the day 14 tick infestation. The 72-h efficacy remained above 94% from the day 14 to the day 98 infestations, when efficacy was still 99.5%. Efficacy at 72 h was above 90% after the day 112 infestation and was still 93% at 72 h after the day 140 infestation. CONCLUSIONS: The deltamethrin-impregnated collar gave greater than 90% control of paralysis ticks for at least 14 weeks.
Assuntos
Doenças do Cão/prevenção & controle , Ixodes , Nitrilas/uso terapêutico , Piretrinas/uso terapêutico , Controle de Ácaros e Carrapatos/métodos , Infestações por Carrapato/veterinária , Acaricidas/uso terapêutico , Animais , Austrália , Cães , Sistemas de Liberação de Medicamentos/veterinária , Feminino , Ixodes/crescimento & desenvolvimento , Masculino , Infestações por Carrapato/prevenção & controle , Resultado do TratamentoRESUMO
Regular injections of copper or vitamin D had no overall effect on growth rate, fleece weight, or the amount of wear of the central incisor teeth of sheep on two Wairarapa farms over 26 months. The greatest amount of tooth wear occurred during the period when soil ingestion (measured by acid-insoluble residue, titanium or aluminium in the faeces) was also greatest. Various indicators of copper, calcium or nutritional status were measured in the blood of control sheep and those receiving vitamin D or copper. At no sampling time was there a significant difference for any of these between groups on either farm. Pasture samples were analysed regularly for calcium, cobalt, copper, magnesium, manganese, molybdenum, phosphorus, sulphur, zinc and percentage ash. At most times values were, on the basis of existing criteria, considered normal. Although the pasture calcium/phosphorus ratio fell below one on several occasions this did not result in a change in plasma calcium or phosphorus levels. On the basis of criteria established for pen-fed sheep, dietary available copper levels on both farms were considered low for much of the time. However, liver and blood copper values were adequate at alI times.
