Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 12.002
Filtrar
Mais filtros








Intervalo de ano de publicação
1.
Rev Bras Parasitol Vet ; 31(1): e018521, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35019028

RESUMO

Ectoparasites of 18 free-living Cuban Ground Doves, Columbina passerina insularis (Columbiformes: Columbidae), captured in the National Zoological Park, Havana, Cuba, were identified. The collected ectoparasites included two species of lice (Phthiraptera: Ischnocera): Columbicola passerinae (77.1%), and Physconelloides eurysema (50%), as well as four species of feather mites (Astigmata: Falculiferidae): Pterophagus lomatus (83.3%), Byersalges talpacoti (50%), Byersalges phyllophorus (72.2%), and Hyperaspidacarus tridentatus (27.7%). Pterophagus lomatus, B. phyllophorus, and H. tridentatus represent new records for Cuba.


Assuntos
Doenças das Aves , Ftirápteros , Animais , Doenças das Aves/epidemiologia , Columbidae , Columbiformes , Cuba
2.
Acta Cir Bras ; 36(12): e361206, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35019066

RESUMO

PURPOSE: To evaluate whether the pigeon (Columba livia) is a good model for evaluating the vestibular system involved with postural maintenance during movement. METHODS: This study maps the brainstem targets of the horizontal ampullary inputs from the vestibular periphery of the pigeon. We used biotin dextran amine (BDA) injection in horizontal semicircular canal (HSCC), immunohistochemistry for GluR2/3 and GluR4 AMPA and computerized histomorphology reconstruction. RESULTS: Our results show the same distribution pattern with ipsilateral projections to vestibular nuclear complex (VNC) from the HSCC, with the majority of labeled fibers being, long, thin, with few varicosities and many ramifications. Horizontal semicircular canal projections achieve neurons belonging to all nuclei of the VNC with exception of dorsal portion of lateral vestibular nucleus and this area express GluR2/3 and GluR4 AMPA receptors reinforcing the idea of glutamate participation in these connections. CONCLUSIONS: Pigeon is an appropriated experimental model to study of projections of HSCC and reinforcing the information that the vestibular system has strong relation with the fast responses necessary for postural control. Moreover, its phylogenetic organization apparently conservation, also seems to be a fundamental characteristic for vertebrates.


Assuntos
Columbidae , Vestíbulo do Labirinto , Animais , Tronco Encefálico , Filogenia , Canais Semicirculares , Ácido alfa-Amino-3-hidroxi-5-metil-4-isoxazol Propiônico
3.
Sci Total Environ ; 806(Pt 3): 151263, 2022 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-34715217

RESUMO

Contamination status and characteristics of perfluorinated alkyl acids (PFAAs) including perfluorinated carboxylic acids (PFCAs) and perfluorinated sulfonic acids (PFSAs) was examined using liver tissue of birds - black-tailed gulls (Larus crassirostris), domestic pigeons (Columba livia var. domestica), pacific loons (Gavia pacifica), herons (Ardea cinerea), and egrets (Egretta garzetta and Ardea alba) - with different trophic levels, habitat types and migratory behaviors from an industrialized coastal region of South Korea. A wide range of PFAAs (1.09 ng/g to 1060 ng/g; median = 52.6 ng/g) were detected in bird livers from the Korean coasts with high detection frequency. Accumulation features of PFAAs in birds indicated that primarily trophic position and secondly habitat type influence the levels and composition of PFAAs, e.g., relatively high PFAA levels and high composition of odd-numbered long carbon chain PFCAs (perfluoroundecanoic acid (PFUnDA) and perfluorotridecanoic acid (PFTriDA)) and PFOS in higher trophic and marine birds. The prevalence of long carbon chain (≥14) PFCAs likely implies a wide use of fluorotelomer-based substances in Korea. Interspecies comparison in the accumulation profile of persistent organic pollutants (including polychlorinated biphenyls (PCBs), organochlorine pesticides, polybrominated diphenylethers (PBDEs), and PFAAs) reveals relatively high load of PFAAs in inland (pigeons) and estuarine (egrets/herons) species compared to marine bird species, indicating wide use of PFAAs in the terrestrial environment.


Assuntos
Poluentes Ambientais , Fluorcarbonetos , Animais , Columbidae , Ecossistema , Monitoramento Ambiental , Fluorcarbonetos/análise , Fígado/química
4.
J Exp Biol ; 224(20)2021 10 15.
Artigo em Inglês | MEDLINE | ID: mdl-34605889

RESUMO

Maternal hormones constitute a key signalling pathway for mothers to shape offspring phenotype and fitness. Thyroid hormones (THs; triiodothyronine, T3; and thyroxine, T4) are metabolic hormones known to play crucial roles in embryonic development and survival in all vertebrates. During early developmental stages, embryos exclusively rely on exposure to maternal THs, and maternal hypothyroidism can cause severe embryonic maldevelopment. The TH molecule includes iodine, an element that cannot be synthesised by the organism. Therefore, TH production may become costly when environmental iodine availability is low. This may yield a trade-off for breeding females between allocating the hormones to self or to their eggs, potentially to the extent that it even influences the number of laid eggs. In this study, we investigated whether low dietary iodine may limit TH production and transfer to the eggs in a captive population of rock pigeons (Columba livia). We provided breeding females with an iodine-restricted (I-) diet or iodine-supplemented (I+) diet and measured the resulting circulating and yolk iodine and TH concentrations and the number of eggs laid. Our iodine-restricted diet successfully decreased both circulating and yolk iodine concentrations compared with the supplemented diet, but not circulating or yolk THs. This indicates that mothers may not be able to independently regulate hormone exposure for self and their embryos. However, egg production was clearly reduced in the I- group, with fewer females laying eggs. This result shows that restricted availability of iodine does induce a cost in terms of egg production. Whether females reduced egg production to preserve THs for themselves or to prevent embryos from exposure to low iodine and/or THs is as yet unclear.


Assuntos
Columbidae , Iodo , Animais , Gema de Ovo , Feminino , Hormônios Tireóideos , Tiroxina , Tri-Iodotironina
5.
J Exp Psychol Anim Learn Cogn ; 47(3): 281-302, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34618528

RESUMO

An innovative adaptive discrimination procedure examined how two bird species, pigeons and starlings, recognize and discriminate two-dimensional (2D) visual shapes. Prior results suggest a comparative divergence between mammals and birds in their relative reliance on vertices versus line segments to mediate discrimination. To address this potentially important difference, four pigeons and five starlings were tested with a square versus triangle discrimination in two experiments. An adaptive genetic algorithm guided the selection and organization of the training and test stimuli. Both species showed considerable flexibility in accurately selecting triangles despite wide variation in stimulus appearance and location. Most critically, Experiment 2 revealed that both bird species relied more on the figures' vertices during successful discrimination than their connecting line segments. This reliance was revealed by both traditional accuracy differences using contour-deleted displays and genetic algorithm-based shifts in "gene values" caused by the birds' selection. These results, in contrast to previous findings, indicate that mammals and birds likely converge in their reliance on vertices as a highly critical feature in visual shape discrimination. (PsycInfo Database Record (c) 2021 APA, all rights reserved).


Assuntos
Columbidae , Estorninhos , Animais , Aprendizagem por Discriminação , Discriminação Psicológica , Percepção Visual
6.
J Exp Psychol Anim Learn Cogn ; 47(3): 303-316, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34618529

RESUMO

Perceptual decision making involves choices between alternatives based on sensory information. Studies in primates and rodents revealed a stochastic perceptual evidence accumulation process that, after reaching threshold, results in action execution. Birds represent a cognitively highly successful vertebrate class that has been evolving independent from mammals for more than 300 million years. The present study investigated whether perceptual decision making in pigeons shows behavioral and computational dynamics comparable to those in mammals and rodents. Using a novel "pigeon helmet" with liquid shutter displays that controls visual input to individual eyes/hemispheres with precise timing, we indeed revealed highly similar dynamics of perceptual decision making. Thus, both mammals and birds seem to share this core cognitive process that possibly represents a fundamental constituent of decision making throughout vertebrates. Interestingly, in our experiments we additionally discovered that both avian hemispheres start independent sensory accumulation processes without any major interhemispheric exchange. Because birds lack a corpus callosum and have only a small anterior commissure, they seem to be forced to decide on motor responses based on unihemispheric decisions under conditions of time pressure. (PsycInfo Database Record (c) 2021 APA, all rights reserved).


Assuntos
Columbidae , Tomada de Decisões , Animais
7.
J Exp Psychol Anim Learn Cogn ; 47(3): 317-325, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34618530

RESUMO

Nonhuman animal models show that reinforcers control behavior through what they signal about the likelihood of future events, but such control is generally imperfect. Imperfect control by the relation between past and likely future events may result from imperfect detection of those events as they occur, which result in imperfect detection of the relation between events. Such an approach would suggest the involvement of more complex psychological processes like memory in simple operant learning. We extended a research paradigm previously examined with nonhuman animals to test the ability of a quantitative model that assumes imperfect control by the relation between events arises because of (a) occasional misallocation of reinforcers to the wrong response, causing imperfect control by the relation between events; and (b) a tendency to explore or exploit which is independent of the relation between events. Children played a game in which one of two different responses could produce a reinforcer. The likelihood of a reinforcer for the same response that produced the last one varied across three conditions (.1, .5, .9). As with nonhuman animal models, children's choices followed these probabilities closely but not perfectly, suggesting strong control by what one reinforcer signals about subsequent reinforcers. Choice was well described by the quantitative model. This same model also provides a good description of nonhuman animal-model data, suggesting fundamentally similar mechanisms of control across species. These findings suggest reinforcers control behavior to the extent the relation between reinforcers can be detected-that is, simple operant learning may be more complex than is typically assumed. (PsycInfo Database Record (c) 2021 APA, all rights reserved).


Assuntos
Columbidae , Reforço Psicológico , Animais , Comportamento de Escolha , Humanos , Aprendizagem , Esquema de Reforço
8.
J Exp Psychol Anim Learn Cogn ; 47(3): 371-383, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34618535

RESUMO

Adaptively and flexibly modifying one's behavior depending on the current demands of the situation is a hallmark of executive function. Here, we examined whether pigeons could flexibly shift their attention from one set of features that were relevant in one categorization task to another set of features that were relevant in a second categorization task. Critically, members of both sets of features were available on every training trial, thereby requiring that attention be adaptively deployed on a trial-by-trial basis based on contextual information. The pigeons not only learned to correctly categorize the stimuli but, as training progressed, they concentrated their pecks to the training stimuli (a proxy measure for attention) on those features that were relevant in a specific context. The pigeons selectively tracked the features that were relevant in Context 1-but were irrelevant in Context 2-and they selectively tracked the features that were relevant in Context 2-but were irrelevant in Context 1. This adept feature tracking requires disengaging attention from a previously relevant feature and shifting attention to a previously ignored feature on a trial-by-trial basis. Pigeons' adaptive and flexible performance provides strong empirical support for the involvement of focusing and shifting attention under exceptionally challenging training conditions. (PsycInfo Database Record (c) 2021 APA, all rights reserved).


Assuntos
Columbidae , Aprendizagem , Animais , Condicionamento Clássico , Condicionamento Operante , Função Executiva
9.
J Zoo Wildl Med ; 52(3): 1003-1008, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34687516

RESUMO

Parasitic infections are frequent in cosmopolitan feral pigeons (Columba livia domestica) that live in cities, but little is known about the effects of parasites in urban feral pigeon populations. A survey was conducted to evaluate the occurrence of endoparasites and the risk factors of feral pigeons in the city of Loja in southern Ecuador between August and October 2019. A total of 166 fecal samples and 80 peripheral blood smears were collected and examined by the McMaster flotation method and Giemsa staining, respectively. The prevalence of gastrointestinal parasites was 79.51% (132/166). Parasites included: Ascaridia columbae in 13.64% (18/132), Capillaria sp. in 3.79% (5/132), Eimeria sp. in 25% (33/132), unidentified coccidia in 75% (99/132), and an unidentified nematode egg in 0.7% (1/132). The presence of intracellular gamonts of Haemoproteus sp. was found in 87.50% (70/80) of examined blood smears. The frequency and intensity of nematodes were different according to the site. Haemoproteus infection was more frequent in individuals with low body mass index. More research should be undertaken to understand parasitic infections and their effects on cosmopolitan synanthropic feral pigeons.


Assuntos
Doenças das Aves , Enteropatias Parasitárias , Nematoides , Animais , Doenças das Aves/epidemiologia , Columbidae , Equador/epidemiologia , Enteropatias Parasitárias/veterinária
10.
Braz J Biol ; 83: e252059, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34669810

RESUMO

The present study describes the haematological profile, feeding preference, and comparison of morphometric characters of blue rock pigeon (Columba livia) breeding pairs. For this purpose, 25 pairs (25 samples per sex) were sampled through Mist nets from district Okara and Bahawalnagar, Punjab, Pakistan. Birds were then anaesthetized with a combination of ketamine HCL (10 mg/kg) and diazepam (0.2 mg/kg) and subjected to morphometric measurements. 5µL blood also was taken from the jugular vein of each anaesthetized bird for haematological analysis. Few pairs were also dissected to remove gastrointestinal tracts (GITs) for food preferences. Results revealed that there are no significant differences in the haematological parameters and feeding preference of breeding pairs of Columba livia. The gut analysis further revealed, the major portion of gut contents consisted of pea and corn in most of the pairs. Regarding the mensural measurements, significant differences were recorded in the body weight, length of the longest primary feather, and chest circumference, whereas the rest of the studied parameters remain nonsignificant between sexes. So, it is concluded that apart from 3 morphometric parameters (body weight, length of longest primary feather and chest circumference), both sexes are alike in term of morphometry, haematology and food preference.


Assuntos
Columbidae , Preferências Alimentares , Animais , Plumas , Paquistão , Melhoramento Vegetal
11.
Braz J Biol ; 83: e246229, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34468515

RESUMO

During this one year study, blood and fecal samples of doves (Zenaida asiatica), ducks (Anas platyrhynchos), pigeons (Columba livia), partridges (Alectoris chukar), turkeys (Meleagris gallopavo) and goose (Chen caerulescens) were collected to assess the parasitic prevalence in these birds. The birds were kept at Avian Conservation and Research Center, Department of Wildlife and Ecology, University of Veterinary and Animal Sciences, Lahore. All these avian species were kept in separate cages and their entire body was inspected on regularly basis to record external parasites. For internal parasites, 100 blood and 100 fecal samples for each species were analyzed. During present study, two species of ectoparasites i.e. fowl ticks (Args persicus) and mite (Dermanyssus gallinae) while 17 species of endoparasites; three from blood and 14 from fecal samples were identified. Prevalence of blood parasites was Plasmodium juxtanucleare 29.3%, Aegyptinella pullorum 15% and Leucoctoyzoon simond 13%. Parasitic species recorded from fecal samples included 6 species of nematodes viz. Syngamus trachea with parasitic prevalence of 50%, Capillaria anatis 40%, Capillaria annulata 37.5%, Heterakis gallinarum 28.3%, Ascardia galli 24% and Allodpa suctoria 2%. Similarly, two species of trematodes viz. Prosthogonimus ovatus having parasitic prevalence of 12.1% and Prosthogonimus macrorchis 9.1% were also recorded from fecal samples of the birds. Single cestode species Raillietina echinobothrida having parasitic prevalence of 27% and 3 protozoan species i.e. Eimeria maxima having prevalence 20.1%, Histomonas meleagridis 8% and Giardia lamblia 5.3% were recorded. In our recommendation, proper medication and sanitation of the bird's houses and cages is recommended to avoid parasites.


Assuntos
Doenças das Aves , Parasitos , Animais , Doenças das Aves/epidemiologia , Columbidae , Paquistão/epidemiologia , Prevalência
12.
Virus Res ; 306: 198566, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34582833

RESUMO

Coronavirus disease 2019 (COVID-19), caused by Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was first reported in Wuhan, China, and rapidly spread throughout the world. This newly emerging pathogen is highly transmittable and can cause fatal disease. More than 35 million cases have been confirmed, with a fatality rate of about 2.9% to October 9, 2020. However, the original and intermediate hosts of SARS-CoV-2 remain unknown. Here, 3160 poultry samples collected from 14 provinces of China between September and December 2019 were tested for SARS-CoV-2 infection. All the samples were SARS-CoV-2 negative, but 593 avian coronaviruses were detected, including 485 avian infectious bronchitis viruses, 72 duck coronaviruses, and 36 pigeon coronaviruses, with positivity rates of 15.35%, 2.28%, and 1.14%, respectively. Our surveillance demonstrates the diversity of avian coronaviruses in China, with higher prevalence rates in some regions. Furthermore, the possibility that SARS-CoV-2 originated from a known avian-origin coronavirus can be preliminarily ruled out. More surveillance of and research into avian coronaviruses are required to better understand the diversity, distribution, cross-species transmission, and clinical significance of these viruses.


Assuntos
Doenças das Aves/virologia , Infecções por Coronavirus/veterinária , Coronavirus/genética , Coronavirus/isolamento & purificação , Variação Genética , Animais , Doenças das Aves/epidemiologia , Galinhas/virologia , China/epidemiologia , Columbidae/virologia , Coronavirus/classificação , Infecções por Coronavirus/epidemiologia , Infecções por Coronavirus/virologia , Patos/virologia , Monitoramento Epidemiológico , Gansos/virologia , Filogenia , Doenças das Aves Domésticas/epidemiologia , Doenças das Aves Domésticas/virologia , SARS-CoV-2/genética , SARS-CoV-2/isolamento & purificação
13.
Dev Psychol ; 57(8): 1274-1290, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34591571

RESUMO

This multistudy article examines whether children's susceptibility to their socialization experiences varies as a function of their dove temperament dispositions, an evolutionarily informed pattern of traits marked by a low threshold of environmental stimulation and greater behavioral flexibility across environmental contexts. Participants in Study 1 consisted of 70 mothers and their 4- to 6-year-old children: M age = 4.79 years; 57% girls; 33% Black or multiracial; 14% Latinx; median annual income range = $55,000 - $74,999. For Study 2, participants were 243 families, including mothers, fathers, and preschool children: M age = 4.60 years; 56% girls; 54% Black or multiracial, 16% Latinx; median annual income = $36,000). The studies used multimethod, multiinformant measurement batteries within a cross-sectional design (i.e., Study 1) or longitudinal design with three annual measurement occasions (i.e., Study 2). Study 1 findings indicated that associations among maternal parenting quality and psychological problems were only significant for children who were high in dove temperament. Consistent with these findings, Study 2 latent growth curve analyses showed that children experiencing high family adversity (i.e., maternal and paternal parenting difficulties, interparental conflict) were more susceptible to subsequent internalizing and social problems only when they were high in dove temperament. Supporting its role as a susceptibility factor, findings revealed that children with dove temperaments evidenced lower levels of psychological problems under supportive family conditions and higher psychological difficulties in adverse family contexts. Analyses further showed that the composition and moderating effects of dove temperament were distinct from other temperamental susceptibility candidates. (PsycInfo Database Record (c) 2021 APA, all rights reserved).


Assuntos
Columbidae , Temperamento , Animais , Criança , Educação Infantil , Pré-Escolar , Estudos Transversais , Feminino , Humanos , Masculino , Poder Familiar
14.
J Vet Med Sci ; 83(11): 1760-1763, 2021 Nov 16.
Artigo em Inglês | MEDLINE | ID: mdl-34556607

RESUMO

A racing pigeon (Columba livia var. domestica), a straggler from Taiwan, was sheltered in Nara Prefecture, Japan in 2020. This pigeon showed hemolysis and elevated levels of hepatobiliary and muscle enzymes. Gametocytes of Haemoproteus columbae (Apicomplexa: Haemosporida) were observed within the host erythrocytes in thin blood smears. A partial sequence of the mitochondrial cytochrome b gene amplified from blood DNA was identical to the lineage HAECOL1 previously reported from pigeons worldwide. This is the first record of H. columbae infection in a sheltered bird in Japan.


Assuntos
Doenças das Aves , Haemosporida , Animais , Doenças das Aves/epidemiologia , Columbidae , Eritrócitos , Haemosporida/genética , Japão/epidemiologia
15.
Parasitol Res ; 120(10): 3569-3580, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34476584

RESUMO

Columbiformes have a worldwide distribution, of which 166 species occur in Eurasia. They have been reported parasitized by coccidians recurrently in recent years; however, Eimeria labbeana (Labbé, 1896) Pinto, 1928, which is first Eimeria sp. from Columbiformes described in the late nineteenth century, is not taxonomically identified by its oocysts since the 1930s. In this context, the current study aimed to supplement the morphology of E. labbeana from Eurasian collared doves Streptopelia decaocto Frivaldszky, 1838 and from a common woodpigeon Columba palumbus Linnaeus, 1758 in Portugal, providing a preliminary genotypic characterization. Three of the four columbiforms were positive for oocysts identified as E. labbeana, which were morphologically revised as having micropyles, in addition to other minor adjustments. Oocysts from S. decaocto and C. palumbus were morphologically identical and equivalent in all morphometric aspects, besides having genotypic similarity of 99.5%. Phylogenetic analysis based on the mitochondrial cytochrome c oxidase subunit 1 gene resulted in a large clade with Eimeria spp. and Isospora spp. from different vertebrates and low similarity between Eimeria spp. from Columbiformes, whereas the phylogenetic analysis based on the small subunit ribosomal RNA gene resulted in well-supported monophyletic groups, including one with the coccidians of columbiform birds.


Assuntos
Coccidiose , Eimeria , Isospora , Animais , Coccidiose/veterinária , Columbidae , Eimeria/genética , Oocistos , Filogenia , Portugal
16.
Parasitol Res ; 120(10): 3555-3567, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34480593

RESUMO

Trichomonosis caused by the flagellate Trichomonas gallinae is one of the most important avian diseases worldwide. The parasite is localised in the oesophageal area of its host and mainly infects pigeon and dove species. During the last decade, a host expansion to passerine birds occurred, making the disease a potential threat for passerine predators as naïve host species. Here, we investigated the effect of the parasite on two Accipiter species in Germany which show a comparable lifestyle but differ in prey choice, the Northern goshawk (Accipiter gentilis) mainly hunting pigeons and the Eurasian sparrowhawk (Accipiter nisus) mainly feeding on passerines. We genetically identified the parasite strains using the Fe-Hydrogenase gene as marker locus and compared the incidence of parasite presence and clinical signs of trichomonosis between nestlings of the two Accipiter species. In total, we identified 14 strains, with nine strains unknown so far. There was a higher strain diversity and prevalence of Trichomonas spp. in goshawks than sparrowhawks (42.4% vs. 21.2%) whereas sparrowhawks when being infected more often displayed clinical signs of trichomonosis than goshawks (37.1% vs. 6.1%). Even though sparrowhawks were mainly infected with the finch epidemic strain and genetic data indicated some variation between isolates, no correlation with virulence could be detected. All in all, goshawks seem to be better adapted to Trichomonas infections, whereas to sparrowhawks, this is a novel disease with more severe manifestations, from individual morbidity to a higher risk of population decline caused by trichomonosis.


Assuntos
Doenças das Aves , Falcões , Tricomoníase , Trichomonas , Animais , Doenças das Aves/epidemiologia , Columbidae , Alemanha/epidemiologia , Trichomonas/genética , Tricomoníase/epidemiologia , Tricomoníase/veterinária
17.
BMC Vet Res ; 17(1): 263, 2021 Aug 05.
Artigo em Inglês | MEDLINE | ID: mdl-34353312

RESUMO

BACKGROUND: Escherichia coli is a bacterial species widely distributed among mammals and avian species, and also a member of the normal intestinal microbiota. However, some E. coli strains of different pathotypes can cause disease in both humans and animals. Atypical enteropathogenic E. coli (aEPEC) can infect both animals and humans or influence the severity of other ongoing infections. RESULTS: In the present study, a total of 332 samples were collected from ducks, geese, turkeys, chickens, and pigeons from the Hungarian Veterinary Diagnostic Directorate, two slaughterhouses, two pigeon keepers and one backyard chicken farm. E. coli was isolated and verified from 319 samples. The isolates were screened by PCR for diarrheagenic E. coli pathotypes. Altogether seven atypical enteropathogenic E. coli (aEPEC) strains were identified: two from four-week-old dead turkeys, two from force-fed geese, and three from pigeons. No further pathotypes were identified in the collection. The atypical EPEC strains were classified phylogenetically to B1, B2, and F, and four out of the seven aEPEC isolates proved to be multidrug resistant. Serotypes of aEPEC strains were uniform collected from same farms and showed diversity between their origins with O76, O145, O109 serogroups. CONCLUSIONS: This is the first report in the literature about aEPEC in goose (Anser anser domestica). Furthermore, this is the first isolation of aEPEC from turkeys and pigeons in Hungary. The uneven distribution of aEPEC in different age groups of poultry suggests that aEPEC disappears with growing up, but stress (e.g.: force-feeding) and concurrent diseases might promote its reappearance in the intestine.


Assuntos
Columbidae/microbiologia , Escherichia coli Enteropatogênica/isolamento & purificação , Aves Domésticas/microbiologia , Envelhecimento , Animais , Escherichia coli Enteropatogênica/genética , Gansos/microbiologia , Genótipo , Hungria , Perus/microbiologia
18.
Parasitol Res ; 120(9): 3263-3272, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34342682

RESUMO

In recent years, increasing attention has been paid to the novel drug delivery systems to reduce the dose of the drug and avoid side effects. Metronidazole has been used for many years in the treatment of anaerobic bacterial and protozoal infections. Nanolactoferrin, a newly developed antibacterial agent originated from lactoferrin, is applied both as an active therapeutic and a drug nanocarrier. The present study describes the development and characterization of metronidazole-loaded lactoferrin nanoparticles (nano-MTZ) as well as reports their antitrichomonal activity on Trichomonas gallinae, the protozoal causative agent of pigeon trichomoniasis. The activity of the nano-MTZ is compared with the regular metronidazole formulation (MTZ) under in vitro and in vivo conditions. Additionally, cytotoxicity of the nano-MTZ to fibroblast cell line and possible hepatotoxicity in treated pigeons were evaluated. Nano-MTZ was prepared based on the thermal treatment method and the average size and surface charge of the dispersion were 30.6 nm and - 44.6 mv, respectively. No significant cytotoxicity was noted for the nano-MTZ in comparison to the MTZ. Loading efficiency in nano-MTZ was calculated as 55%. In vitro susceptibility results demonstrated 24 h 90% lethal concentration values of 4.23 and 6.64 µg/mL for MTZ and nano-MTZ, respectively. Oral treatment of the pigeons experimentally infected with T. gallinae resulted in the earlier eradication of the infection in the nano-MTZ-treated pigeons. No adverse effects on the liver function have been observed for the nano-MTZ. These findings suggest that nanolactoferrin is a promising platform for the development of novel MTZ formulations with improved antitrichomonal activity.


Assuntos
Antitricômonas/uso terapêutico , Columbidae/parasitologia , Lactoferrina , Metronidazol/uso terapêutico , Nanopartículas , Tricomoníase , Animais , Tricomoníase/tratamento farmacológico , Tricomoníase/veterinária
19.
BMC Res Notes ; 14(1): 305, 2021 Aug 09.
Artigo em Inglês | MEDLINE | ID: mdl-34372924

RESUMO

OBJECTIVE: Navigation is the most important feature of homing pigeons, however no integrated response to genetic mechanism of navigation has been reported. The generated data herein represent whole-genome resequencing data for homing pigeon and three other breeds of rock pigeons. Selective sweep analysis between homing pigeon and other breeds of rock pigeon can provide new insight about identification of candidate genes and biological pathways for homing pigeon ability. DATA DESCRIPTION: Whole-genomes sequence data related to 95 birds from four breeds of rock pigeons including, 29 feral pigeons, 24 Shiraz tumblers, 24 Persian high flyers and 18 homing pigeons were provided. More than 6.94 billion short reads with coverage (average ≈7.50 x) and 407.1 Gb data were produced. Whole genome sequencing was carried out on the Illumina Hiseq 2000 platform using a 350 bp library size and 150 bp paired-end read lengths. The whole genome sequencing data have been submitted at the NCBI SRA Database (PRJNA532675). The presented data set can provide useful genomic information to explain the genetic mechanism of navigation ability of homing pigeons and also testing other genetic hypothesis by genomic analysis.


Assuntos
Columbidae , Genoma , Animais , Columbidae/genética , Genômica , Sequenciamento de Nucleotídeos em Larga Escala
20.
Avian Dis ; 65(2): 213-218, 2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-34412450

RESUMO

One dead 6-wk-old male racing pigeon (Columba livia) was submitted for postmortem evaluation after presenting with weight loss, anorexia, dry shanks, dehydration, and lethargy. The bird belonged to a confined flock with 12 other pigeons raised by a hobbyist. Two pigeons in the flock reportedly had died with a history of similar clinical signs. On gross examination, the liver and the spleen were diffusely dark brown to black. Histopathology revealed moderate to large amounts of anisotropic, intracytoplasmic black pigment, compatible with hemozoin, in the spleen, liver, lung, and kidneys, with small amounts in the heart and meninges of the brain. Marked plasmacytic infiltrates were observed in liver, lungs, heart, and kidneys. Blood smears from a clinically affected concomitant pigeon from the flock revealed numerous light-blue, round to oval, intraerythrocytic trophozoites and meronts suggestive of Plasmodium spp. PCR and sequencing tests were performed from spleen and ceca with fragments of the 18S ribosomal RNA and the mitochondrial cytochrome b (cytB) genes. Sequencing results confirmed the presence of Plasmodium in the affected pigeon. Although an exact genetic match could not be determined, the most similar species to the isolate from this study are Plasmodium relictum, Plasmodium matutinum, Plasmodium lutzi, and Plasmodium homocircumflexum.


Assuntos
Doenças das Aves/patologia , Doenças das Aves/parasitologia , Columbidae/parasitologia , Malária Aviária/diagnóstico , Plasmodium/classificação , Animais , Autopsia/veterinária , Citocromos b/química , Citocromos b/genética , Evolução Fatal , Hemeproteínas/metabolismo , Fígado/metabolismo , Fígado/patologia , Pulmão/patologia , Malária Aviária/parasitologia , Malária Aviária/patologia , Masculino , Plasmodium/genética , Plasmodium/isolamento & purificação , Reação em Cadeia da Polimerase , RNA Ribossômico 18S/química , RNA Ribossômico 18S/genética , Baço/metabolismo , Baço/patologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA