ALTERAÇÕES CLÍNICAS, HISTOPATOLÓGICAS E ENZIMÁTICAS EM OVINOS INFECTADOS EXPERIMENTALMENTE POR Trypanosoma vivax

Almeida, Katyane de Sousa; Freitas, Fagner Luiz Costa; Tebaldi, José Hairton; Alessi, Antônio Carlos; Machado, Rosângela Zacarias; Nascimento, Adjair Antônio do

doi:10.5216/cab.v11i3.5971

Cited by 13 publications

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“…The symptomatology described agrees with that found by Almeida et al (2010). However, anorexia, wheezing, signs of fatigue after exertion, and weight loss were only observed in the sheep that subsequently died.…”

Section: Resultssupporting

confidence: 87%

“…In addition, because the sheep in this experiment were previously healthy, normal appetite was present in the studied groups. According to Moraes (2001) and Almeida et al (2010), during the course of trypanosomiasis, oscillations in parasitemia and even episodes of aparasitemia that may be related to the host's immune response and antigenic variation of glycoproteins are commonly observed (NANTULYA, 1990;CROSS, 2003, CADIOLI, 2005.…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of animal performance, feed intake, and economic losses in sheep experimentally infected with Trypanosoma vivax

Brito

Lima

Oliveira

et al. 2017

SCA

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Trypanosoma vivax is a protozoan originating from the African continent, which, although it has not yet been able to complete its biological cycle in South America, due to the absence of the tsetse fly, can still cause death in ruminants. The objective of this study was to verify the effects of T. vivax on the measurements and indices in sheep that characterize animal performance, as well as on economic losses in meat animals. Twenty intact adult male sheep were used for this study, all of approximately the same ages and weights, reared in confinement, and subjected to the same management and diet, which was balanced and supplemented with adequate minerals. The animals were divided into two groups: the control group (CG) and the infected group (IG), which was inoculated intravenously with 1.3 x 10 5 trypomastigotes of T. vivax. Feed intake was verified daily, whereas the feed conversion (FC), feed efficiency index (FEI), and weight gain were obtained weekly. Total weight gain (TWG) was determined after 70 days post-infection. The economic loss was calculated by subtracting the value obtained (IG) from the expected value (CG), and the difference was expressed as a percentage. A randomized block design was used to isolate the effect of the initial weight. The means were compared by the Student "t" test at 5%. Of the 10 infected animals, one died from the parasitism, yielding a rate much lower than that observed in natural outbreaks. The groups presented similar feed intakes throughout the experimental period; however, the TWG of the infected group was significantly lower (50.7%) than that of the CG. Similarly, the daily weight gain (DWG), feed conversion (FC), and feed efficiency index (FEI) of the IG were significantly lower than those of the CG. In addition, the worst rates of FC and FEI coincided with parasitemia peaks and recurrences, probably due to immunological demand and tissue repair. The abdominal circumference of the infected animals was statistically lower than that of the CG, which may be directly related to fat mobilization, in addition to the possible negative effect on the digestive capacity. The economic losses due to weight alone were 24.07% and could reach 31.66% of the herd value due to animal death. Infection with T. vivax negatively affected animal performance indices, even when the animals were well nourished. Trypanosoma vivax in sheep destined for slaughter caused economic losses of 31.66% due to the decrease in performance and the death rate in the infected group. ResumoO Trypanosoma vivax é um protozoário originário do Continente Africano que mesmo não completando seu ciclo biológico na América do Sul, devido à ausência da mosca tsé-tsé, pode levar ruminantes a óbito. O presente trabalho teve por objetivo verificar, em ovinos infectados, os efeitos do T. vivax em medidas e índices que caracterizam o desempenho animal, bem como perdas econômicas em animais de abate. Para tanto foram utilizados vinte ovinos adultos, machos, inteiros com idade e peso aproximados, criados em confina...

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Evaluation of animal performance, feed intake, and economic losses in sheep experimentally infected with Trypanosoma vivax

Brito

Lima

Oliveira

et al. 2017

SCA

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“…However, in the present study, the transferrin concentrations remained high throughout the period of the experiment. This was similar to the results observed in goats that were infected experimentally with Trypanosoma evansi (PATELLI et al, 2008) and sheep infected with T. vivax (ALMEIDA, 2007). Transferrin is a beta globulin synthesized by hepatic cells, and its function is related to transportation of plasma iron, with antibacterial and antiviral activity, and its plasma concentration increases in cases of iron deficiency and during pregnancy (KANEKO et al, 2008).…”

Section: Resultssupporting

confidence: 82%

Systemic inflammatory response indicators in rabbits (Oryctolagus cuniculus) experimentally infected with sporulated oocysts of Eimeria stiedai (Apicomplexa: Eimeriidae)

Freitas

Yamamoto

Freitas

et al. 2011

Rev. Bras. Parasitol. Vet.

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Hemograms and acute-phase proteins in adult male New Zealand White rabbits that had been experimentally infected orally with sporulated oocysts of Eimeria stiedai were evaluated over a 28-day period. Fifty animals were used, divided into two groups: group A infected with 1 × 10(4) sporulated oocysts of E. stiedai and group B inoculated with distilled water. On the seventh day after infection, the infected animals presented anemia and leukocytosis with neutrophilia and monocytosis. Protein fractionation by means of electrophoresis identified 19 acute-phase proteins with molecular weights ranging from 24 to 238 kD. Ceruloplasmin, transferrin and haptoglobin showed high levels on the seventh day after infection, with gradual increases in their concentrations until the end of the experimental period. Thus, from the data of the present study, E. stiedai is considered to be a pyogenic etiological agent for which the infection level can be monitored through the leukocyte count and serum concentrations of ceruloplasmin, transferrin and haptoglobin, and these can be recommended as complementary tests.

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“…The results of the study showed that, at the beginning of the outbreak, naturally infected cows showed signs of clinical progression that are typical of the acute phase of trypanosomiasis, which were similar to those reported in most research studies on T. vivax, including high parasitemia, hyperthermia, anorexia, decreased milk production, and significant hematocrit reduction (MORAES, 2001;PELLÍN et al, 2003;BATISTA et al, 2006;ALMEIDA et al, 2010).…”

Section: Discussionsupporting

confidence: 81%

Clinical evaluation and reproductive indices of dairy cows naturally infected with Trypanosoma vivax

Batista

Freitas

Silva

et al. 2017

SCA

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The present study was aimed to assess the clinical changes and reproductive indices of dairy cows naturally infected with Trypanosoma vivax in a herd located in the Central Sertão of Ceará, Brazil. For the study, 40 animals were selected from a herd consisting of 210 dairy cows, and subdivided into two groups: group I, consisting of 20 cows naturally infected with T. vivax, and group II, consisting of 20 uninfected cows. Data on the parameters of reproductive efficiency were evaluated using a farm database (Propad Profissional GP®), in which the individual reproductive characteristics of the animals were stored. Data collected both before and after the outbreak were compared. The cows from group I showed a sudden drop in milk production, mucosal pallor, depression, anorexia, and a significant increase in rectal temperature and decreased hematocrit during the parasitemia outbreak. These clinical signs of the disease disappeared over time. However, T. vivax was detected by polymerase chain reaction (PCR) in animals with a negative parasitological test one year after the occurrence. Comparison of the reproductive index data for cows from groups I and II before and after the outbreak showed significant differences in first postpartum estrus, service period, and intervals between deliveries. In addition, repetition of estrus and abortion were significantly associated with T. vivax infection. Analysis of the reproductive indices of cows in groups I and II suggests that T. vivax infection decreased the reproductive efficiency of the study cows. animais eram armazenadas em software Propad Profissional GP®, sendo as informações obtidas, comparadas tanto no período em que antecedeu o surto, quanto no que ocorreu após ele. As vacas do grupo I apresentaram durante o surto alta parasitemia, queda brusca da produção de leite, palidez de mucosas, depressão, anorexia, aumento significativo da temperatura retal e redução do hematócrito. Observou-se o desaparecimento dos sinais clínicos da enfermidade ao longo do tempo, no entanto, houve a confirmação do diagnóstico de T. vivax, através da Reação em Cadeia da Polimerase (PCR) em animais com exame parasitológico negativo um ano após a ocorrência. Quando comparados os dados dos índices reprodutivos das vacas do grupo I e do grupo II, no período em que antecedeu o surto, e no que ocorreu após o surto, verificou-se diferenças significativas para as variáveis: primeiro estro pós-parto (PCPP/dias), período de serviço (PS-dias) e intervalo entre parto/dias (IEP). Houve associação significativa das variáveis, repetições de estro e abortamento com a infecção por T. vivax. A análise dos dados dos índices reprodutivos das vacas dos grupos I e II sugere que T. vivax diminuiu a eficiência reprodutiva dos animais avaliados. Palavras-chave: Bovino. Eficiência reprodutiva. Tripanossomose.

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ALTERAÇÕES CLÍNICAS, HISTOPATOLÓGICAS E ENZIMÁTICAS EM OVINOS INFECTADOS EXPERIMENTALMENTE POR Trypanosoma vivax

Cited by 13 publications

References 0 publications

Evaluation of animal performance, feed intake, and economic losses in sheep experimentally infected with Trypanosoma vivax

Evaluation of animal performance, feed intake, and economic losses in sheep experimentally infected with Trypanosoma vivax

Systemic inflammatory response indicators in rabbits (Oryctolagus cuniculus) experimentally infected with sporulated oocysts of Eimeria stiedai (Apicomplexa: Eimeriidae)

Clinical evaluation and reproductive indices of dairy cows naturally infected with Trypanosoma vivax

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