Navegando por Autor "VEROCAI, Guilherme Gomes"

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Acesso aberto (Open Access)
Efficacy of the d-phenothrin/pyriproxyfen association against mites in naturally co-infested rabbits
(2013-05) FERNANDES, Julio Israel; VEROCAI, Guilherme Gomes; RIBEIRO, Francisco de Assis; MELO, Raquel Moreira Pires dos Santos; AZEVEDO, Thaís Ribeiro Correia; COUMENDOUROS, Katherina; SCOTT, Fabio Barbour
The aim of the present study was to evaluate the efficacy of the d-phenothrin/pyriproxyfen association against Psoroptes ovis, Cheyletiella parasitivorax, and Leporacarus gibbus infestations in naturally co-infested rabbits. Twenty crossbreed (New Zealand White x California) rabbits concurrently infested by the three mite species were randomly divided in two groups. All rabbits presented with hyperemia, erythema and formation of crusts in the ear canals caused by P. ovis. Infestations by both C. parasitivorax and L. gibbus were considered asymptomatic in all animals.Ten animals were treated with a 4.4% d-phenothrin and 0.148% pyriproxyfen spray formulation until have their body surface uniformly sprayed, including external ear canals. The other ten rabbits remained untreated, serving as control group. Observations were done on days +7, +14, +21, +28, and +35 post-treatment. The d-phenothrin/pyriproxyfen association showed 100% efficacy against the three mite species and was responsible for the remission of psoroptic mange lesions on treated animals. No signs of intoxication were observed. The results indicate that d-phenothrin/pyriproxyfen spray formulation in a single application is an effective and clinically safe option for the control of different mite infestations in rabbits.
Acesso aberto (Open Access)
Eficácia acaricida de uma emulsão contendo 10% de óleo de nim (Azadirachta indica) no controle de Psoroptes ovis em coelhos naturalmente infestados
(2012-12) FERNANDES, Julio Israel; VEROCAI, Guilherme Gomes; RIBEIRO, Francisco de Assis; MELO, Raquel Moreira Pires dos Santos; AZEVEDO, Thaís Ribeiro Correia; VEIGA, Cristiano Chaves Pessoa da; VIEIRA, Vanessa Paulino da Cruz; SCOTT, Fabio Barbour
The objective of the present study was to evaluate the efficacy of an emulsion containing 10% of neem (Azadirachta indica) oil on the control of Psoroptes ovis in naturally infested rabbits. Twelve rabbits were randomly divided in two groups of six animals. The control group remained without treatment; while animals in the other group were treated with the 10% neem extract formulation by spraying both ears daily for seven consecutive days. The animals were evaluated daily for the presence of adverse effects. Material from ears all animals was collected on days +3, +7, +14, +21, +28 and +35, and evaluated for the presence of living mites. Animals from control group presented mites in both ears along all days of observation. The treated group presented an efficacy of 41.7% on day +3 and 100% from day +7 to +35. The product containing 10% neem oil has demonstrated to be effective for the treatment of psoroptic mange on rabbits. However, treated animals presented dermatological reaction such as alopecia and hyperemia at the site of application, varying from low to medium severity.
Acesso aberto (Open Access)
Inefficacy of albendazole sulphoxide and ivermectin for the treatment of bovine parasitic otitis caused by rhabditiform nematodes
(2009-11) VEROCAI, Guilherme Gomes; FERNANDES, Julio Israel; AZEVEDO, Thaís Ribeiro Correia; MELO, Raquel Moreira Pires dos Santos; ALVES, Pedro Afonso de Preaulx Moreira; SCOTT, Fabio Barbour; GRISI, Laerte
The purpose of this study was to evaluate the efficacy of orally administered albendazole sulphoxide and pour-on ivermectin for the treatment of bovine parasitic otitis caused by rhabditiform nematodes. Eighteen Gyr cows presenting clinical otitis were divided in three groups with six animals each. The first one did not receive any treatment (control group). The second one was treated with 0.5% pour-on ivermectin, 500µg/kg of body weight, and the third group was treated with oral 6% albendazole sulphoxide, at 6.0mg/kg. Both ear canals of each animal were reexamined on days 7 and 21 post treatment. The animals in the control group remained infected throughout the days of observation. Ivermectin treatment did not show effectiveness on days 7 or 21 post treatment. The albendazole sulphoxide treatment had an efficacy of 16.7 and 25% on days 7 and 21, respectively. Further studies are required to assess an effective treatment for this parasitic disease, especially via alternative administration routes, because of its significant impact on Bos taurus indicus cattle breeding in Tropical and Subtropical Regions.