Veterinária
URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11842
Navegar
4 resultados
Resultados da Pesquisa
Item Ovicidal activity of seven Pochonia chlamydosporia fungal isolates on Ascaris suum eggs(Tropical Animal Health and Production, 2010-11-19) Ferreira, Sebastião R.; Araújo, Jackson V.; Braga, Fabio R.; Araujo, Juliana M.; Carvalho, Rogério O.; Silva, André R.; Frassy, Luiza N.; Freitas, Leandro G.The ovicidal effect of the nematophagous fungus Pochonia chlamydosporia on eggs of Ascaris suum was tested under laboratory conditions. A. suum eggs were plated on 2% water–agar with seven fungal isolates (Isol. 5, Isol. 31, Isol. 1, VC1, Isol. 12, Isol. 22 and VC4) and control without fungus. After 5, 7, 10, 14, 15 and 21 days of incubation, approximately 100 eggs were removed from the plates and classified according to the following parameters: type 1, biochemical and physiological effect without morphological damage to the eggshell, type 2, lytic effect with morphological alteration of the eggshell and embryo and type 3, lytic effect with morphological alteration of eggshell and embryo showing hyphal penetration and internal egg colonization. The isolates effectively destroyed A. suum eggs and all types of effects were observed during the experiment. There was no variation in ovicidal capacity (type 3 effect) among the isolates (p > 0.05) throughout the experiment. After 21 days, isolate 5 showed the highest percentages of type 3 effect (58.33%). The results indicated that P. chlamydosporia (Isol. 5, Isol. 31, Isol. 1, VC1, Isol. 12, Isol. 22 and VC4) can destroy A. suum eggs and is, therefore, a potential biological control agent of nematodes.Item In vitro predatory activity of the fungi Duddingtonia flagrans, Monacrosporium thaumasium, Monacrosporium sinense and Arthrobotrys robusta on Ancylostoma ceylanicum third-stage larvae(Veterinary Microbiology, 2010-05-03) Braga, Fabio R.; Silva, André R.; Carvalho, Rogério O.; Araújo, Jackson V.; Guimarães, Pedro Henrique G.; Fujiwara, Ricardo T.; Frassy, Luiza N.The potential role of companion animals as reservoirs for zoonotic diseases has been recognised as a significant public health problem worldwide. Ancylostoma ceylanicum is the only ancylostomatidae species known for infecting human beings. This article aimed to compare the predatory capacity of predatory fungi isolates Duddingtonia flagrans (AC001), Monacrosporium thaumasium (NF34), Monacrosporium sinense (SF53) and Arthrobotrys robusta (I31) on A. ceylanicum infectious larvae (L3) in a 2% water–agar plate. There was no predatory capacity variation among the fungi tested (P > 0.05) over the 7-day period experimental assay. When compared to the control (without fungi), there was a significant reduction (P < 0.05) of 95.6%, 85.1%, 87.4% and 90.2% on the A. ceylanicum L3 mean recovered from treatments with isolates AC001, NF34, SF53 and I31, respectively. Regarding linear regression coefficients, negative values were noted for treatments, therefore indicating A. ceylanicum non-predated larvae reduction over 7 days. In this work, all predatory fungi isolates were efficient at capturing and destroying in vitro the A. ceylanicum L3; therefore being able to be used as biological controllers of such nematode.Item Predatory activity of the nematophagous fungus Duddingtonia flagrans on horse cyathostomin infective larvae(Tropical Animal Health and Production, 2010-03-07) Braga, Fabio R.; Araújo, Jackson V.; Silva, André. R.; Carvalho, Rogério O.; Araujo, Juliana M.; Ferreira, Sebastião R.; Benjamin, Laércio A.This work was performed to determine the predatory capacity in vitro of the nematophagous fungus Duddingtonia flagrans (isolate AC001) on cyathostomin infective larvae of horse (L3). The experimental assay was carried out on plates with 2% water-agar (2% WA). In the treated group, each plate contained 1.000 L3 and 1.000 conidia of the fungus. The control group without fungus only contained 1.000 L3 in the plates. Ten random fields (4 mm diameter) were examined per plate of treated and control groups, every 24 h for seven days under an optical microscope (10× and 40× objective lens) for non-predated L3 counts. After 7 days, the non-predated L3 were recovered from the Petri dishes using the Baermann method. The interaction there was a significant reduction (p < 0.01) of 93.64% in the cyathostomin L3 recovered. The results showed that the D. flagrans is a potential candidate to the biological control of horse cyathostomin L3.Item Biological control of infective larvae of Ancylostoma spp. in beach sand(Revista Iberoamericana de Micología, 2013-05-23) Mello, Ingrid Ney Kramer de; Braga, Fabio R.; Monteiro, Thalita S.Avelar; Freitas, Leandro G.; Araujo, Juliana M.; Soares, Filippe E.Freitas; Araújo, Jackson V.Geohelminths are parasites that stand out for their prevalence and wide distribution, depending on the soil for their transmission. The aim of this work was to evaluate the predatory capacity of the fungal isolate of the genus Duddingtonia (CG768) on third stage larvae (L3) of Ancylostoma spp. in beach sand under laboratory conditions. In the assay A five treatment groups and 1 control group were formed. The treatment groups contained 5000, 10,000, 15,000, 20,000 or 25,000 chlamydospores of the fungal isolate and 1000 Ancylostoma spp. L3 in pots containing 30 g of sand. The control group (without fungus) contained only 1000 Ancylostoma spp. L3 and distilled water in pots with 30 g of sand. Evidence of predatory activity was observed at the end of 15 days, where we observed the following percentages of reduction of L3: Group 1 (4.5%); Group 2 (24.5%); Group 3 (59.2%); Group 4 (58.8%); Group 5 (63%). However, difference was noted (p < 0.01) only at concentrations 15,000, 20,000 and 25,000 in relation to control group. In the assay B two groups were formed in Petri dishes of 9 cm in diameter containing agar water 2% medium. In the treated group, each Petri dish contained 500 Ancylostoma spp. L3 and 5 g of sand containing the isolate CG 768 at a concentration of 25,000 chlamydospores/g of sand, and the control group (without fungus) contained only 500 L3. At the end of 7 days the non-predation L3 of Petri dishes using the method of Baermann were recovered. Difference (p < 0.01) between groups on reducing the average number of Ancylostoma spp. L3 (percent reduction of 84%) was observed. The results of this study confirm earlier work on the efficiency of the Duddingtonia genus in the control of Ancylostoma spp. infective larvae.