Publications

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occurrence of velogenic viscerotropic newcastle disease in pet and exotic birds in 1991.in 1991, velogenic viscerotropic newcastle disease (vvnd) was diagnosed in domestic psittacine birds in six states: illinois, indiana, michigan, texas, california, and nevada. in the first four states, the disease assumed outbreak proportions. the affected psittacine birds--yellow-headed amazon parrots (amazona ochrocephala oratrix), yellow-naped amazon parrots (amazona ochrocephala auropalliata), cockatiels (nymphicus hollandicus), and conures (unknown species)--exhibited respiratory and/or cen ...19938452504
management of an ingested lead foreign body in an amazon parrot.an adult male, double-yellow-head amazon parrot (amazona ochrocephala oratrix) was presented with a 36-h history of seizure episodes. on presentation, the bird was slightly obtunded, seizured once for approximately 20 sec and the seizure was controlled with midazolam. whole body radiographs revealed a 2-mm diameter, circular, dense object in the ventriculus. a presumptive diagnosis was made of lead toxicosis, and supportive care of sc fluids and gavage feedings. calcium disodium edta and chelati ...200212458638
a survey of selected parasitic and viral pathogens in four species of mexican parrots, amazona autumnalis, amazona oratrix, amazona viridigenalis, and rhynchopsitta pachyrhyncha.isolated populations of four species of mexican parrots were sampled for evidence of selected pathogens of concern in birds originating in latin america. data were collected between june and september 1997, and ectoparasite collection was repeated with rhynchopsitta pachyrhyncha in september 2000. serum samples from nine amazona oratrix, 10 amazona viridigenalis, 6 amazona autumnalis, and 25 r. pachyrhyncha chicks were screened for neutralizing antibodies to psittacid herpesvirus and avian influ ...200517323565
cutaneous lymphosarcoma in a double yellow-headed amazon parrot (amazona ochrocephala oratrix).a 2-year-old double yellow-headed amazon parrot (amazona ochrocephala oratrix) was presented for evaluation of a mass on the left wing. a second soft tissue swelling was present under the left mandible and a third in the right inguinal region. the bird had pale mucous membranes, but no other abnormalities were observed on physical examination. results of the complete blood count and plasma biochemical profile were anemia and decreased total solids. cytologic findings from fine needle aspirates o ...200718351007
t-cell chronic lymphocytic leukemia in a double yellow-headed amazon parrot (amazona ochrocephala oratrix).an adult, male double yellow-headed amazon parrot (amazona ochrocephala oratrix) was diagnosed with chronic lymphocytic leukemia based on results of a complete blood cell count and cytologic examination of a bone marrow aspirate. treatment with oral chlorambucil was attempted, but no response was evident after 40 days. the bird was euthanatized, and the diagnosis of chronic lymphocytic leukemia was confirmed on gross and microscopic examination of tissues. neoplastic lymphocytes were found in th ...201122458185
hydrocephalus in a yellow-headed amazon parrot (amazona ochrocephala oratrix).a 37-year-old female yellow-headed amazon parrot (amazona ochrocephala oratrix) was presented after a 4-month-period behavior change and intermittent episodes of obtunded mentation. clinical findings on physical examination included ataxia, a weak grasp, and reluctance to move. results of magnetic resonance imaging were consistent with severe hydrocephalus without evidence of cerebrospinal fluid obstruction. the bird was treated with tapering dosages of prednisolone over a 4-month period, during ...201122216723
combined hepatocellular-cholangiocarcinoma in a yellow-headed amazon (amazona oratrix).a 9-year-old male yellow-headed amazon (amazona oratrix) with a history of anorexia and vomiting died of a liver tumor. the tumor consisted of neoplastic cells with hepatocellular and cholangiocellular differentiations and their intermingled areas. neoplastic hepatocytes showed islands or trabecular growth with vacuolated eosinophilic cytoplasm. cells showing biliary differentiation formed ducts or tubules lined by cytokeratin ae1/ae3-positive epithelia, accompanied by desmoplasia consisting of ...201323800973
[nesting habitat characterization for amazona oratrix (psittaciformes: psittacidae) in the central pacific, mexico].the nesting requirements of the yellow-headed parrot (amazona oratrix) are poorly understood, despite their broad historical distribution, high demand for pet trade and current endangered status. information concerning their nesting requirements is required in order to design specific restoration and conser- vation actions. to assess this, we studied their nesting ecology in the central pacific, michoacan, mexico during a ten year period. the analyzed variables ranged from local scale nest site ...201425412536
[[characterization of the potential geographical distribution area of parrot species in yucatan peninsula, mexico].psittacidae family is one of the most endangered groups in mexico, since many of their habitats are disappearing. in this research, we characterized the land cover of the potential geographical distribu- tion area of eight extant parrot species within the yucatan peninsula. we used the maximum entropy algorithm (maxent) and species historical records. to externally validate the models, we used presence and absence records from field observations (2010-2012). to characterize the distribution area ...201425720184
yersinia pseudotuberculosis, serogroup o:1a, infection in two amazon parrots (amazona aestiva and amazona oratrix) with hepatic hemosiderosis.necropsies were conducted on a female blue-fronted amazon (amazona aestiva) and a female yellow-headed amazon (amazona oratrix) that died after depression, ruffled feathers, diarrhea, and biliverdin in the urine. gross and microscopic examinations revealed multifocal necrosis in the liver, spleen, lungs, kidneys, intestines, and heart caused by acute bacteremia. yersinia pseudotuberculosis, serogroup o:1a, was isolated by culturing from the visceral lesions in the liver, intestines, and spleen. ...201526352966
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