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Jamaican fruit bats (Artibeus jamaicensis) are used as an animal model for several viruses, including Middle East respiratory syndrome virus, dengue virus, Zika virus, and Tacaribe virus. However, despite ongoing studies regarding these pathogens, little is known regarding the bats' normal physiology. In this study, phlebotomy of the propetagial (cephalic) vein was performed to establish baseline hematologic parameters in an apparently healthy, captive population of Jamaican fruit bats. Furthermore, we compared results from physically restrained and isoflurane-anesthetized bats. Our findings indicate significant increases in WBC count, lymphocytes, and monocytes in the anesthetized bats. However, RBC and platelet parameters were not different between the 2 groups. This information on the normal hematologic parameters of Jamaican fruit bats, adds to our overall understanding of the normal physiology of this species, and expands our knowledge on bat species in general.

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The vertebral heart score or size (VHS) measurement is routinely used to provide a more objective measurement of cardiomegaly in dogs. However, breed or body conformation can influence the VHS. To assess the specific VHS for the Australian Cattle Dog, left-to-right lateral, right-to-left lateral, dorsoventral and ventrodorsal thoracic radiographs from 20 individuals free from cardiac and pulmonary disease were obtained. The mean VHS was significantly higher in Australian Cattle Dog (10.5 ± 0.4 vertebrae), when compared with the average VHS for 100 normal dogs of different breeds that had been initially published (9.7 ± 0.5 vertebrae). This emphasizes the importance of breed-specific VHS ranges. In our study group of normal Australian Cattle Dogs, the mean VHS was 10.5 ± 0.5 vertebrae (mean ±SD) on right lateral and 10.3 ± 0.5 vertebrae on left lateral radiographs. The VHS on right lateral views was significantly larger than on left lateral views. The VHS was 10.5 ± 0.6 vertebrae on dorsoventral and 11.1 ± 0.6 vertebrae on ventrodorsal radiographs. The VHS on ventrodorsal views was significantly larger than on dorsoventral views.

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The density-related permanence test (DRP) is used to classify young birds (while in groups) according to their individual permanence in proximity to either a high or low density of conspecifics (HD or LD, respectively). The birds' performance in DRP was associated with underlying differences in the social responses of their individuals. Quails in homogeneous groups of LD residents responded with less compact groups and higher levels of agonistic interactions to the presence of an intruder, and showed higher levels of agonistic interactions among cagemates than the homogeneous groups of HD birds. This study deepen the characterization of DRP evaluating whether contrasting behavior during test is associated with birds' stress responses to challenging situations during rearing. Plasma corticosterone responses were individually assessed after submitting DRP categorized birds to a brief (10 min) partial restraint (mechanical stressor; experiment 1), or after introducing them during 5 min as intruders in homogeneous groups of 6 unknown same category (HD or LD) conspecifics (social stressor; experiment 2). Experiment 1 showed that basal corticosterone levels were similar in all groups and the partial mechanical restraint induced an increase in plasma corticosterone concentration also in all groups. However, the increase induced by the stressor was higher in the LD birds than in their HD counterparts. In experiment 2, compared to controls, social stressor showed no plasma corticosterone changes in the intruders that were introduced in an unfamiliar group of HD conspecifics. However, intruders (both HD and LD) that were visiting the LD residents showed an increased corticosterone response compared to their control counterparts. Results suggest that categorization of birds in the DRP test could have relevance for selection programs oriented to obtain birds better suited to intensive rearing conditions that includes high density of animals and exposure to unavoidable stressors.

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A imobilização é uma prática comum na reabilitação de lesões musculo esqueléticas, mas que pode, por sua vez, ocasionar, adicionalmente, diversos danos à estrutura inicialmente comprometida. Dentre os recursos empregados para reverter os danos oriundos da imobilização, a principal foi a terapia aquática que, aliada aos efeitos benéficos da imersão em água auxilia nos ajustes fisiológicos do corpo. O objetivo do presente estudo foi analisar o conteúdo proteico e estrutural da musculatura diafragmática e hepática de ratas pós-imobilização com terapia aquática. O projeto foi aprovado pelo Comitê de Ética para o Uso de Animais da Universidade Estadual do Ceará, sob o protocolo nº 1122178 de 05/10/2017. Foram utilizadas 32 ratos, fêmeas, Wistar, divididas em quatro grupos: Controle (CTR), Imobilizado (I), Terapia Aquática (TA) e Imobilizado/Terapia Aquática (ITA). A imobilização ocorreu no membro posterior direito, incluindo a pelve, o quadril, fêmur, o joelho (extensão), tíbia e tornozelo (flexão plantar) ,durante duas semanas. A terapia aquática ocorreu durante seis dias por semana, ao longo de duas semanas. Após esse período, os animais foram eutanasiados e as estruturas de interesse dissecadas: diafragma e fígado. Para avaliação muscular e hepática, foi realizada uma dosagem de proteínas. O trofismo muscular foi calculado pela razão entre o peso úmido do músculo diafragmático (mg) e o peso corporal final (g) dos animais. Os dados foram analisados por Anova-One-Way, com p<0,05 e teste de Brown-Forsythee Kruskal-Wallis, além de uma correlação de Pearson. Os resultados foram expressos em média ± erro padrão da média. O processo de não utilização por duas semanas, associados ao tratamento de terapia aquática não foi capaz de alterar significativamente o conteúdo proteico e estrutural da musculatura diafragmática e das reservas hepáticas.

Immobilization is a common practice in the rehabilitation of musculoskeletal injuries, but this may in turn cause several damages to the initially compromised structure. Among the resources used to reverse the damage from immobilization, the main one was the aquatic therapy, combined with the beneficial effects of immersion in water, helps with the physiological adjustments of the body. The objective of the present study was to analyze the protein and structural content of the diaphragmatic and hepatic muscles of post-immobilization rats with aquatic therapy. The project was approved by the Committee of Ethics for the Use of Animals of the State University of Ceará, under the protocol nº1122178 of 05/10/2017. Thirty-two female Wistar rats were divided into four groups: Control (CTR), Immobilized (I), Aquatic Therapy (TA) and Immobilized with Aquatic Therapy (ITA). Immobilization occurred in the right hind limb, including the pelvis, hip, femur, knee (extension), tibia, and ankle (plantar flexion) for two weeks. Aquatic therapy occurred for six days a week over two weeks. After this period the animals were euthanized and the structures of interest were dissected: diaphragm and liver. For muscular and hepatic evaluation, protein quantity was evaluated. Muscle trophism was calculated by the ratio of wet diaphragmatic muscle weight (mg) to the final body weight (g) of the animals. The data were analyzed by Anova-one-Way, with p<0.05 and test of Brown-Forsythe and Kruskal-Wallis, Pearson correlation. Results were expressed as the average ± the standard error of measurement. It was found that the process of not using associated with aquatic therapy treatment for two weeks was not able to significantly alter the protein and structural content of the diaphragmatic muscles and liver reserves.

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A imobilização é uma prática comum na reabilitação de lesões musculo esqueléticas, mas que pode, por sua vez, ocasionar, adicionalmente, diversos danos à estrutura inicialmente comprometida. Dentre os recursos empregados para reverter os danos oriundos da imobilização, a principal foi a terapia aquática que, aliada aos efeitos benéficos da imersão em água auxilia nos ajustes fisiológicos do corpo. O objetivo do presente estudo foi analisar o conteúdo proteico e estrutural da musculatura diafragmática e hepática de ratas pós-imobilização com terapia aquática. O projeto foi aprovado pelo Comitê de Ética para o Uso de Animais da Universidade Estadual do Ceará, sob o protocolo nº 1122178 de 05/10/2017. Foram utilizadas 32 ratos, fêmeas, Wistar, divididas em quatro grupos: Controle (CTR), Imobilizado (I), Terapia Aquática (TA) e Imobilizado/Terapia Aquática (ITA). A imobilização ocorreu no membro posterior direito, incluindo a pelve, o quadril, fêmur, o joelho (extensão), tíbia e tornozelo (flexão plantar) ,durante duas semanas. A terapia aquática ocorreu durante seis dias por semana, ao longo de duas semanas. Após esse período, os animais foram eutanasiados e as estruturas de interesse dissecadas: diafragma e fígado. Para avaliação muscular e hepática, foi realizada uma dosagem de proteínas. O trofismo muscular foi calculado pela razão entre o peso úmido do músculo diafragmático (mg) e o peso corporal final (g) dos animais. Os dados foram analisados por Anova-One-Way, com p<0,05 e teste de Brown-Forsythee Kruskal-Wallis, além de uma correlação de Pearson. Os resultados foram expressos em média ± erro padrão da média. O processo de não utilização por duas semanas, associados ao tratamento de terapia aquática não foi capaz de alterar significativamente o conteúdo proteico e estrutural da musculatura diafragmática e das reservas hepáticas.(AU)

Immobilization is a common practice in the rehabilitation of musculoskeletal injuries, but this may in turn cause several damages to the initially compromised structure. Among the resources used to reverse the damage from immobilization, the main one was the aquatic therapy, combined with the beneficial effects of immersion in water, helps with the physiological adjustments of the body. The objective of the present study was to analyze the protein and structural content of the diaphragmatic and hepatic muscles of post-immobilization rats with aquatic therapy. The project was approved by the Committee of Ethics for the Use of Animals of the State University of Ceará, under the protocol nº1122178 of 05/10/2017. Thirty-two female Wistar rats were divided into four groups: Control (CTR), Immobilized (I), Aquatic Therapy (TA) and Immobilized with Aquatic Therapy (ITA). Immobilization occurred in the right hind limb, including the pelvis, hip, femur, knee (extension), tibia, and ankle (plantar flexion) for two weeks. Aquatic therapy occurred for six days a week over two weeks. After this period the animals were euthanized and the structures of interest were dissected: diaphragm and liver. For muscular and hepatic evaluation, protein quantity was evaluated. Muscle trophism was calculated by the ratio of wet diaphragmatic muscle weight (mg) to the final body weight (g) of the animals. The data were analyzed by Anova-one-Way, with p<0.05 and test of Brown-Forsythe and Kruskal-Wallis, Pearson correlation. Results were expressed as the average ± the standard error of measurement. It was found that the process of not using associated with aquatic therapy treatment for two weeks was not able to significantly alter the protein and structural content of the diaphragmatic muscles and liver reserves.(AU)

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The use of serum lactate has become increasingly common in Veterinary Medicine, since it is an excellent marker of tissue oxygenation, elevated in situations of tissue hypoxia, where anaerobic glycolysis is used as an energy source. Studies point out its use in dogs as a prognostic factor in several affections; however it is not commonly used in domestic felines due to the high stress threshold of the species, which may interfere with their values. The aim of the present study was to evaluate serum lactate values in domestic cats during physical restraint and after chemical restraint using the combination of 8mg/kg ketamine-S, 0.4 mg/kg midazolam, and 2 mg/kg Tramadol. To this end, 20 clinically healthy female cats without defined race, from six months to five years of age, were divided into two groups, GPR (n = 10) represented by felines that had only physical restraint and the GCR (n = 10) by felines that underwent physical restraint (TPR) and after 30 hours by chemical restraint (TCR). It was observed that in both groups (GPR and CPR) during physical restraint presented hyperlactatemia (GPR = 6.23 ± 0.9 mmol/L ­ GCR ­ Tpr = 6.66 ± 1.59 mmol/L) and mean values of 4.42 ± 1.28 mmol/L during chemical restraint (GCR ­ Tcr). It was concluded that physical restraint interferes with serum lactate values, with the reduction of such values with the use of chemical restraint in the feline species.(AU)

A utilização do lactato sérico é cada vez mais comum na Medicina Veterinária, por ser um excelente marcador de oxigenação tecidual, elevando-se em situações de hipóxia tecidual e realizando a glicólise anaeróbica como fonte de energia. Pesquisas científicas em cães o apontam como fator prognóstico em diversas afecções, sendo pouco utilizado em felinos domésticos devido ao elevado limiar de estresse da espécie, podendo interferir em seus valores. Assim, este trabalho avaliou os valores de lactato sérico em felinos domésticos durante contenção física e após contenção química, utilizando a associação de 8 mg/kg de cetamina-S, 0,4 mg/kg de midazolam e 2 mg/kg de cloridrato de tramadol. Foram estudados 20 felinos, fêmeas, sem raça definida, de seis meses a cinco anos de idade, clinicamente saudáveis, divididos em dois grupos, com GPR (n = 10) representado por felinos que passaram apenas por contenção física e com GCR por felinos que passaram por contenção física (TPR) e após 30 horas por contenção química (TCR). Foi observado em ambos os grupos (GPR e GCR) e durante a contenção física a hiperlactatemia sérica (GPR = 6.23 ± 0.9 mmol / L ­ GCR ­ TPR = 6.66 ± 1.59 mmol / L) com valores médios de 4,42 ± 1,28 mmol/L durante a contenção química (GCR ­ TCR). Conclui-se que a contenção física interfere nos valores do lactato sérico, com redução dos valores na utilização da contenção química na espécie felina.(AU)

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The use of serum lactate has become increasingly common in Veterinary Medicine, since it is an excellent marker of tissue oxygenation, elevated in situations of tissue hypoxia, where anaerobic glycolysis is used as an energy source. Studies point out its use in dogs as a prognostic factor in several affections; however it is not commonly used in domestic felines due to the high stress threshold of the species, which may interfere with their values. The aim of the present study was to evaluate serum lactate values in domestic cats during physical restraint and after chemical restraint using the combination of 8mg/kg ketamine-S, 0.4 mg/kg midazolam, and 2 mg/kg Tramadol. To this end, 20 clinically healthy female cats without defined race, from six months to five years of age, were divided into two groups, GPR (n = 10) represented by felines that had only physical restraint and the GCR (n = 10) by felines that underwent physical restraint (TPR) and after 30 hours by chemical restraint (TCR). It was observed that in both groups (GPR and CPR) during physical restraint presented hyperlactatemia (GPR = 6.23 ± 0.9 mmol/L ­ GCR ­ Tpr = 6.66 ± 1.59 mmol/L) and mean values of 4.42 ± 1.28 mmol/L during chemical restraint (GCR ­ Tcr). It was concluded that physical restraint interferes with serum lactate values, with the reduction of such values with the use of chemical restraint in the feline species.(AU)

A utilização do lactato sérico é cada vez mais comum na Medicina Veterinária, por ser um excelente marcador de oxigenação tecidual, elevando-se em situações de hipóxia tecidual e realizando a glicólise anaeróbica como fonte de energia. Pesquisas científicas em cães o apontam como fator prognóstico em diversas afecções, sendo pouco utilizado em felinos domésticos devido ao elevado limiar de estresse da espécie, podendo interferir em seus valores. Assim, este trabalho avaliou os valores de lactato sérico em felinos domésticos durante contenção física e após contenção química, utilizando a associação de 8 mg/kg de cetamina-S, 0,4 mg/kg de midazolam e 2 mg/kg de cloridrato de tramadol. Foram estudados 20 felinos, fêmeas, sem raça definida, de seis meses a cinco anos de idade, clinicamente saudáveis, divididos em dois grupos, com GPR (n = 10) representado por felinos que passaram apenas por contenção física e com GCR por felinos que passaram por contenção física (TPR) e após 30 horas por contenção química (TCR). Foi observado em ambos os grupos (GPR e GCR) e durante a contenção física a hiperlactatemia sérica (GPR = 6.23 ± 0.9 mmol / L ­ GCR ­ TPR = 6.66 ± 1.59 mmol / L) com valores médios de 4,42 ± 1,28 mmol/L durante a contenção química (GCR ­ TCR). Conclui-se que a contenção física interfere nos valores do lactato sérico, com redução dos valores na utilização da contenção química na espécie felina.(AU)

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Background: Several techniques have been used for the treatment of fractures in large animals, once these animals are frequently subject to trauma that interrupts bone continuity, especially in long bones. The choice for the technique depends on the configuration of the fracture, damage to the adjacent tissue, and presence or absence of bone exposure. The success of the modified Thomas splint, associated to synthetic casting has been reported in several studies. However, there still are restrictions to the use of this technique. Thus, the objective of the present study is to report the use of immobilization by the modified Thomas splint, coupled with synthetic casting, for the treatment of fractures in long bones of bovine and equine animals.Cases: The five animals were treated at the Veterinary Hospital of the Universidade Paranaense, being four bovines and one equine, all presenting fractures in long bones, resulting from accidental trauma. The equine, weighting 300 kg, presented fracture in the third metacarpal bone, previously submitted to immobilization through external fixation type II. Three bovines, weighting 50, 200, and 500 kg, presented fractures in the metacarpals, with the smallest presenting exposed fracture, another bovine, weighting 300 kg, presented fractures in the radius and ulna. The animals were examined and submitted to sedation and anesthesia for manual...

As fraturas de ossos longos ocorrem com relativa frequência em animais de grande porte [9] acarretando significativas perdas econômicas para a pecuária nacional [10], já que os elevados custos implicados no tratamento refletem na opção pela eutanásia [9]. No entanto, animais de alto valor econômico, estimulam o investimento em pesquisas e a utilização de efetivas técnicas para a correção de fraturas [10]. Nos últimos anos várias técnicas têm sido utilizadas no tratamento de fraturas em animais de grande porte, no entanto, ainda persiste a falta de dispositivos de fixação adequados e desenvolvidos especificamente para esses animais [3]. Relata-se o uso de gesso até o carpo/tarso ou por toda a extensão do membro [1], aparelho modificado de Thomas associado ou não à tala de gesso [6], utilização de parafusos, pinos intramedulares e placas ortopédicas [7], haste intramedular bloqueada [11] e fixação externa [4]. O sucesso do uso da muleta de Thomas modificada, associada ao gesso, tem sido relatado por diversos autores e, muitas vezes, é a opção de escolha em comparação com técnicas de fixação interna. Com base nisto, o presente trabalho tem como objetivo relatar cinco casos das espécies bovina e equina que apresentavam fratura decorrente de trauma, corrigidas com a utilização de muleta de Thomas modificada e gesso sintético, enfatizando a empregabilidade da técnica...

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BACKGROUND: Feline night monkeys are very susceptible to stress when handled, and because of that, the use of anesthetic and physical restraint methods should be carefully evaluated. To ensure a safer anesthesia to the animals the present study aimed to observe the influence of four restraint protocols in the blood pressure of Aotus azarae infulatus. METHODS: Blood pressure was obtained from 10 animals subjected to restraining protocols using tiletamine and zolazepam, isoflurane, ketamine and midazolam, and physical restraint and results were evaluated to determine their effect on this exam. RESULTS: Among the restraint protocols tested, the anesthetic isoflurane promoted lower blood pressure values and no differences were observed between values measured in both arms in all groups. CONCLUSION: The results of our study suggest that all restraint protocols tested significantly alter blood pressure in this species of primates.

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Background: Several techniques have been used for the treatment of fractures in large animals, once these animals are frequently subject to trauma that interrupts bone continuity, especially in long bones. The choice for the technique depends on the configuration of the fracture, damage to the adjacent tissue, and presence or absence of bone exposure. The success of the modified Thomas splint, associated to synthetic casting has been reported in several studies. However, there still are restrictions to the use of this technique. Thus, the objective of the present study is to report the use of immobilization by the modified Thomas splint, coupled with synthetic casting, for the treatment of fractures in long bones of bovine and equine animals.Cases: The five animals were treated at the Veterinary Hospital of the Universidade Paranaense, being four bovines and one equine, all presenting fractures in long bones, resulting from accidental trauma. The equine, weighting 300 kg, presented fracture in the third metacarpal bone, previously submitted to immobilization through external fixation type II. Three bovines, weighting 50, 200, and 500 kg, presented fractures in the metacarpals, with the smallest presenting exposed fracture, another bovine, weighting 300 kg, presented fractures in the radius and ulna. The animals were examined and submitted to sedation and anesthesia for manual...(AU)

As fraturas de ossos longos ocorrem com relativa frequência em animais de grande porte [9] acarretando significativas perdas econômicas para a pecuária nacional [10], já que os elevados custos implicados no tratamento refletem na opção pela eutanásia [9]. No entanto, animais de alto valor econômico, estimulam o investimento em pesquisas e a utilização de efetivas técnicas para a correção de fraturas [10]. Nos últimos anos várias técnicas têm sido utilizadas no tratamento de fraturas em animais de grande porte, no entanto, ainda persiste a falta de dispositivos de fixação adequados e desenvolvidos especificamente para esses animais [3]. Relata-se o uso de gesso até o carpo/tarso ou por toda a extensão do membro [1], aparelho modificado de Thomas associado ou não à tala de gesso [6], utilização de parafusos, pinos intramedulares e placas ortopédicas [7], haste intramedular bloqueada [11] e fixação externa [4]. O sucesso do uso da muleta de Thomas modificada, associada ao gesso, tem sido relatado por diversos autores e, muitas vezes, é a opção de escolha em comparação com técnicas de fixação interna. Com base nisto, o presente trabalho tem como objetivo relatar cinco casos das espécies bovina e equina que apresentavam fratura decorrente de trauma, corrigidas com a utilização de muleta de Thomas modificada e gesso sintético, enfatizando a empregabilidade da técnica...(AU)

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Guinea pigs are useful animal models for the study of many human diseases including diabetes mellitus and infectious diseases. Often, these studies involve collecting blood samples of considerable volume. This column describes safe techniques for restraint and blood collection from the jugular vein and cranial vena cava from alert and anesthetized guinea pigs.

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BACKGROUND: Alterations in cellular and chemical constituents in blood are indicators of physical or chemical restraint in deer. OBJECTIVES: The aim of this study was to determine the effects of physical and chemical restraint on hematologic and biochemical analytes in captive brown brocket deer (Mazama gouazoubira). METHODS: Six adult deer were physically restrained and randomly anesthetized in a crossover design using 3 protocols (P). In P1, anesthesia was induced directly with isoflurane using a face mask and was maintained with isoflurane delivered by endotracheal tube. In P2, oral premedication with midazolam was followed 1 hour later by induction and maintenance of anesthesia with isoflurane, as in P1. In P3, intravenous anesthesia with a combination of ketamine, xylazine, and atropine was followed by anesthesia with isoflurane, as in P1. Blood was collected immediately after physical restraint (T0) and during anesthesia at 20-minute intervals (T15, T35, and T55). Hematologic and biochemical constituents were determined using manual methods or automated analyzers, with cortisol measured by enzyme immunoassay. RESULTS: During physical restraint, following food and water restriction, significant hemoconcentration, increased WBC count, and lower cortisol concentration were observed compared with results at T15, T35, and T55. During anesthesia, lymphocyte count was lower in P2 than P1, urea concentration was decreased at T15 using P2, and plasma glucose concentration was increased after T0 (P<.01). Among the anesthetic protocols, there was a trend for decreased cortisol concentration using P2. CONCLUSIONS: Physical restraint and anesthesia affect some blood constituents in captive brown brocket deer, and midazolam premedication may modify the intensity of the stress response.

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The objective was to compare the effects of ketamine-xylazine or tiletamine-zolazepam combinations as anesthetic protocols for captive coatis (Nasua nasua) for semen collection by electroejaculation. Five mature male coatis were physically restrained and then anesthetized by im injections of ketamine (10mg/kg) plus xylazine (1mg/kg) or a tiletamine-zolazepam combination (8 mg/kg). For the two combinations, additional quarter-doses of ketamine or the tiletamine-zolazepam combination were administered when necessary. Semen was collected by electroejaculation and immediately evaluated for color, volume, pH, sperm motility, vigor, morphology, acrosomal integrity, and percentage of live cells. Overall, collection of nine ejaculates was attempted from five animals for each treatment. Regardless of the anesthetic combination, all animals developed an erection during each attempt to collect semen. Ejaculates were obtained in all (9 of 9) attempts that used ketamine-xylazine for anesthesia, but in only 3 of 9 attempts (P<0.05) when tiletamine-zolazepam was used. All ejaculates contained sperm, with no significant differences in semen characteristics between the two anesthetic combinations. Recovery was smooth in all animals. In conclusion, semen collection by electroejaculation in coatis was significantly more successful with the use of a ketamine-xylazine combination than with tiletamine-zolazepam.

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The marsh deer (Blastocerus dichotomus) is an endangered species from the marshlands of central South America. Its population has declined in several regions due to the loss of available habitat caused by human activities, especially the construction of hydroelectric dams. The capture of individual deer is critical for research programs and population management. This report describes a novel live-capture technique, which uses a helicopter to drive the animals into a terrain that restricts their movement such as thick vegetation or deep water (60-120 cm in depth). Following confinement, animals are manually restrained. The short pursuit time (median = 2 min), low mortality rate (0.82-3.28%), and the absence of injury to both the capture team and animals suggest that this method is appropriate for the safe capture of this species. Body temperature correlated with the pursuit time (R2 = 0.15) but was not significantly altered with pursuit times <3 min.

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OBJECTIVE: The absence of a standardized recording technique and of normal reference patterns may have hindered the use of experimental electroencephalography (EEG) in dogs and in veterinary medicine as well. Therefore, the aim of the present work was to develop a recording technique for brachycephalic, mesocephalic and dolichocephalic breeds of dogs that would standardize the recording parameters, including the electrical activity of the rhinencephalon and prorean gyrus, and to prove its feasibility for detecting abnormal activity. METHODS: We accomplished this task by employing 12 recording electrodes. Three different doses of xylazine (0.5, 1 and 1.5 mg/kg) were used to determine which gave enough sedation to obtain a recording free of artifact. Fifty normal dogs were studied; for comparison 9 epileptic dogs were also explored. RESULTS: We found specific anatomical skull sites where the EEG recording electrodes should be attached; the location of these sites is, in practical terms, the same for every dog, regardless of their skull type. A dose of 1 mg/kg xylazine was chosen for restraining. Normal dogs displayed predominant 6-12 Hz waves which could be recognized all over the cortex. Epileptic dogs were individualized because of the appearance of paroxysmal discharges, composed of spikes, sharp and anomalous sinusoidal waves which usually started in one area, spreading to the whole cortex later on, in the clinical interictal periods. CONCLUSIONS: It was possible to obtain more extensive electrophysiological coverage of the canine cerebral cortex, including the rhinencephalon and prorean gyrus, than previously described in the literature. Intramuscular or subcutaneous xylazine, at a dose of 1 mg/kg, proved to produce the best restraint for recordings. The technique allowed to distinguish abnormal activity in epileptic dogs.

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