ABSTRACT
This study reports the occurrence of Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae) as parasitoid of Cyrtoneurina pararescita (Diptera: Muscidae) (Couri, 1995) in bovine feces obtained in Goiânia, Goiás state, Brazil. Bovine manure samples, collected at two weeks intervals, were taken to the laboratory and the pupae were extracted by water flotation. Each pupa was placed in capsules of gelatin until the emergence of dipterous or their parasitoids. The parasitism percentage was of 2.4%. This paper reports the first occurrence of N. vitripennis as parasitoid of C. pararescita worldwide.
Subject(s)
Animals , Insecticides , Muscidae/parasitology , Pest Control, Biological , Veterinary Public HealthABSTRACT
Foram avaliadas taxas de gestação aos 15 dias e perda gestacional entre 15 e 60 dias em 430 transferências de embrião (TE) em éguas Mangalarga Marchador. Diagnósticos de gestação foram realizados entre 15 e 60 dias após TE. Para avaliar os efeitos da duração da fase folicular da receptora, foram formados três grupos: até três dias (<3d); quatro a seis dias (4-6d); sete ou mais dias (>7d). Para avaliar os efeitos do tamanho do folículo pré-ovulatório da receptora, foram formados outros três grupos: menor ou igual a 35mm (Ø<35); maior que 35 e menor ou igual a 45mm (35<Ø<45); maior que 45mm (Ø>45). Os grupos foram comparados pelo teste qui-quadrado (P<0,05). Quanto à duração da fase folicular, as taxas de gestação foram semelhantes (<3d - 83,1%; 4-6d - 86,4%; >d - 86,0%), e a perda gestacional maior em >7d (24,4%) que em <3d(12,0%) e 4-6d (13,3%), estas semelhantes entre si. Quanto ao tamanho folicular, as taxas de gestação foram semelhantes (Ø<35 - 86,4%; 35<Ø<45 - 86,5%; Ø>45 - 81,9%), assim como as de perda gestacional (Ø<35 - 13,2%; 35<Ø<45 - 18,1%; Ø>45 - 10,5%). Razões para a maior perda gestacional no grupo >7dnão foram esclarecidas, mas conclui-se que a duração da fase folicular pode ser fator de escolha de receptoras.
Pregnancy rates were evaluated at 15 days and pregnancy loss between 15 and 60 days on 430 embryo transfers (ET) in Mangalarga Marchador mares. Pregnancy diagnosis was performed between 15 and 60 days after ET. To evaluate the effects of the duration of the follicular phase of the recipient mare, three groups were formed: up to 3 days (<3d); 4 to 6 days (4-6d); 7 or more days (>7d). To evaluate the effects of the size of the pre-ovulatory follicle of the recipient mare, three other groups were formed: below or equal to 35mm (Ø<35); greater than 35 and below or equal to 45mm (35<Ø<45); greater than 45mm (Ø>45). The groups were compared by Chi-square test (P<0.05). Regarding the duration of the follicular phase, pregnancy rates were similar (<3d - 83.1%; 4-6d - 86.4%; >7d - 86.0%), and greater pregnancy loss in >7d (24.4%) than in <3d (12.0%) and 4-6d (13.3%), which were similar. Regarding the follicle size, pregnancy rates (Ø<35 - 86.4%; 35<Ø<45 - 86.5%; Ø>45 - 81.9%) and pregnancy loss (Ø<35 - 13.2%; 35<Ø<45 - 18.1%; Ø>45 - 10.5%) were similar. Reasons for the greatest pregnancy loss in the >7d group have not been elucidated, but we conclude that the duration of the follicular phase may be a factor for choosing recipient mares.
Subject(s)
Animals , Abortion, Veterinary , Embryo, Mammalian/embryology , Pregnancy/metabolism , Horses/classificationABSTRACT
The action of five acaricides was evaluated on eggs, larvae, nymphs and adults of the ixodid tick Rhipicephalus sanguineus. The acaricides tested were: high cis-cypermethrin (0.01 per cent) + DDVP (0.11 per cent), coumaphos (0.05 per cent), deltamethrin (0.0025 per cent) and cypermethrin (0.015 per cent). Eggs treated with high cis-cypermethrin and cypermethrin showed eclosion inhibitions of 72.1 per cent and 67.3 per cent, respectively, whereas coumaphos was much less effective (only 11.7 per cent). Except for coumaphos, which resulted in 63.3 per cent and 80.0 per cent mortality of nymphs and unfed females, respectively, all compounds tested killed 100 por cento of all tick stages to which they were exposed
Subject(s)
Dogs , Insecticides , Parasitology , TicksABSTRACT
Between June/1990 and February/1991, an experiment about ixodological populations of the ears of equines from counties of Minas Gerais and from Guanambi, Bahia, was carried out. Anocentor nitens was the mostprevalent (97.50 per cent) and most abundant (98.35 per cent) species, followed by Boophilus microplus (36.10 per cent and 1.59 per cent) and Amblyomma cajennense (20.50 per cent e 0.06 per cent). The larvae of A. nitens and B. microplus were more prevalent than the other parasitic stages, and we didn't find larvae of A. cajennense. The ratios between male and female were 3.5 and 1.7, to B. microplus and A. nitens, respectively (
Subject(s)
Animals , Horses , Tick-Borne DiseasesABSTRACT
Realizou-se estudo sobre aspectos biológicos da fase näo parasitária do Dermacentor nitens proveniente de equinos de vários municípios de Minas Gerais e de Guanambi, Bahia. Entre as várias amostras estudadas, verificaram-se diferenças nos percentuais de eclosäo e nos índices de eficiência reprodutiva em decorrência do grande número de fêmeas ingurgitadas que näo realizou postura, e semelhanças nos períodos de pré-postura, postura e incubaçäo, sugerindo constante fluxo gênico entre as populaçöes estudadas
Subject(s)
DermacentorABSTRACT
Avaliou-se a sensibilidade de fêmeas ingurgitadas de Dermacentor nitens provenientes de equinos de vários municípios de Minas Gerais e de Guanambi, Bahia, frente a acaricidas de bases fosforado, piretróide e fosforado + piretróide. Observaram-se diferenças de sensibilidade ao produto fosforado entre as amostras estudadas. Com exceçäo da amostra proveniente de Montalvânia/Varzelândia, todas as amostras foram igualmente sensíveis ao produto piretróides e todas elas sensíveis ao produto misto