941 resultados para BOVINOS - RAZAS


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In extensive animal husbandry, natural or artificial ponds allow direct access of cattle to water but result in degradation of water quality and in increased health risks. Under such circumstances eutrophication occurs and consequently algal bloom, among them toxigenic cyanobacteria. The present study aimed to report the occurrence of cyanobacteria in the drinking water of cattle and to describe their physical and chemical parameters, as pH, temperature and dissolved oxygen. Nineteen samples of natural ponds or water troughs formed predominantly as result of rainfall from six farms located in the Southeast and Midwest regions of Brazil were analyzed for the presence of cyanobacteria, and pH, temperature and dissolved oxygen was measured. Microcystis and/or Merismopedia were detected in two ponds; one of them was covered with intense flowering. The values of pH, temperature and dissolved oxygen in 19 collections were pH 7.2-9.7, 31-34ºC and 7.8-30mg/l respectively. Also non-pathogenic algae of several genera were detected besides the occurrence or not of cianogenics. Under these conditions, the common practices of drinking water supply for extensively raised cattle and the possibilities of eutrophication and cyanobacterial growth bring potential risks for animal health.

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Nas últimas décadas, as proteínas de fase aguda (PFAs) tornaram-se biomarcadores de escolha em medicina humana para identificação e monitoração de doenças. Não há razão para imaginar que tais pesquisas clínicas não sejam igualmente úteis na medicina veterinária. Com o objetivo de verificar a importância das PFAs como biomarcadores de doenças inflamatórias em bovinos, determinou-se o proteinograma sérico, por meio da técnica de eletroforese SDS-PAGE, com interesse especial nas PFAs. Foram utilizados 30 animais, distribuídos em dois grupos: 15 bovinos sadios e 15 bovinos doentes (cinco com mastite estafilocócica, cinco com fotossensibilização e cinco com onfaloflebite). Os animais foram submetidos a colheitas diárias de sangue durante sete dias, enquanto internados no Hospital Veterinário da Unesp, Campus de Jaboticabal. Ceruloplasmina e haptoglobina apresentaram elevação significativa em animais acometidos por mastite, fotossensibilização e onfaloflebite (275,17% e 343,71%; 175,17% e 230,19%; 114,47% e 144,47%, respectivamente). A α1-glicoproteína ácida foi um bom biomarcador apenas em animais com mastite e fotossensibilização, elevando, respectivamente, suas concentrações séricas em 198,14% e 145,89%. Fibrinogênio mostrou-se um indicador confiável apenas em bovinos com mastite, com elevação de 146,5% em relação ao grupo sadio. Ficou clara a diferença na responsividade de distintas PFAs frente a diferentes estímulos inflamatórios. Ceruloplasmina e haptoglobina foram biomarcadores mais sensíveis e, portanto, mais confiáveis entre as PFAs estudadas nessa espécie.

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Comparou-se a produção de embriões a partir de ovócitos oriundos de ovários com e sem corpo lúteo de vacas da raça Nelore, em relação à qualidade e quantidade de ovócitos obtidos, embriões produzidos, taxa de prenhez e proporção dos sexos. Foram realizadas aspirações foliculares dos dois ovários de 219 vacas em 250 seções, igualmente distribuídas em cinco grupos, sendo G1=fêmeas gestantes; G2=não gestantes, com CL e submetidas a tratamento hormonal com progestágeno+BE+PGF2∝; G3=não gestantes, sem CL e com o mesmo tratamento de G2; G4=não gestantes, com presença de CL e sem tratamento; G5=não gestantes, sem presença de CL e sem tratamento. Os resultados foram avaliados pela análise de variância (ANOVA) e aplicado o Teste de Tukey para comparação entre médias, a 5% de significância, pelo programa SISVAR. Já para comparação de proporção de sexos dentro e entre os grupos, foi utilizado o teste de comparação múltipla de proporções. O G4 produziu maior média de ovócitos totais aspirados que G2 e G3. Comparando-se os três grupos que apresentavam CL (G1, G2, G4), o G4 foi superior a G1 e G2 em ovócitos totais, no ovário com e sem CL. Em ovócitos viáveis, G2 foi superior a G1 no ovário com CL. Os ovócitos obtidos de ovários com CL é que resultaram em melhores índices de produção de embriões. As vacas gestantes produziram melhor nos ovários sem CL, com mais ovócitos viáveis (p<0,05) e iguais em embriões (p>0,05), em relação ao ovário com CL. As taxas de prenhez e proporção dos sexos foram semelhantes entre os grupos (p>0,05). A concentração de progesterona (P4) foi diferente entre os grupos, mas não influenciou as variáveis analisadas. A utilização do tratamento hormonal não melhorou os resultados de nenhuma variável. Portanto, o melhor critério de escolha de doadoras Nelore para programas de Produção in vitro (PIV) de embriões é o conhecimento individual de cada animal ao longo das seções de aspiração folicular.

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Pós-graduação em Genética e Melhoramento Animal - FCAV

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Pós-graduação em Genética e Melhoramento Animal - FCAV

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Pós-graduação em Medicina Veterinária - FMVZ

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Pós-graduação em Medicina Veterinária - FMVZ

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Pós-graduação em Biologia Geral e Aplicada - IBB

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Background: The use of all by-products of bovine slaughter is of high economic importance for the industries of products of animal origin. Among these products, fat has an important role, once fat rendering may generate several different products, such as protein material that may be used in the manufacture of meat products. However, in spite of the importance that the use of all by-products has for the economic balance of the industry, there are no reports on their use in Brazil, or studies that supply data on microbiological and physical-chemical local standards for this protein. Thus, the objective of this study was to evaluate microbiological and physical-chemical characteristics of protein material obtained from fat rendering, as well as to provide support for companies to use fat rendering to generate protein material, adding value to industrialized meat products.Materials, Methods & Results: The experimental production of edible protein obtained of fat rendering was conducted in slaughterhouse with supervision of the Brazilian Ministry of Agriculture, Livestock and Food Supply. Protein material was obtained in a continuous, humid heat system at high temperatures. Fat scraps containing protein were ground and cooked at high temperature (85 degrees C), and placed in a three phase decanter centrifuge. After centrifugation, protein material was ground again and packed. Samples were collected from 15 batches of protein material, and the following microbiological analyses were carried out: counts of aerobic mesophilic and psychrotrophic microorganisms, coliforms at 35 degrees C, Escherichia coli, sulfite-reducing Clostridium, and Staphylococcus aureus, besides presence or absence of Salmonella and Listeria monocytogens. The following physical-chemical analyses were also carried out: protein, total lipid, moisture, ash, carbohydrate, and energy content. Mean counts of mesophiles, psychrotrophs, and coliforms at 35 degrees C were 4.17; 3.69 and 1.87 (log CFU/g), respectively. Levels of protein, total lipids, moisture, ashes and carbohydrates were 27.50; 7.83; 63.88%; 0.24%; and 0.55%, respectively, and energy content was 182.63 kcal/100g.Discussion: Results of microbiological analyses demonstrated that, although low, the final product showed to be contaminated. Contamination that occurred during the second grinding procedure may be an explanation for these bacterial counts. Also, the temperature used for fat fusion was not enough to eliminate thermoduric microorganisms. However, even with the presence of indicator microorganisms in the samples, none was contaminated by E. coli, sulfite-reducing Clostridium, S. aureus, Salmonella or L. monocytogenes. Physical-chemical analyses showed that the product had adequate nutritional quality. Based on these results, it was possible to conclude that protein material obtained in fat rendering showed characteristics that enable the use of this product as raw material for processed meat products. Besides, the present study was the first one to present scientific results in relation to edible by-products obtained in fat rendering, supplying important information for slaughterhouses and meat-processing plants. The study also produced relevant data on the innocuousness of the product, which may be used to guide decision-making of health inspectors.

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The preventive efficacy of ivermectin and abamectin administered in different routes (subcutaneous, intramuscular and pour-on) and doses (200 and 500mcg kg(-1)) against Cochliomyia hominivorax in the scrotal sac of cattle after castration, was evaluated. Animals from six different farms, in the state of Sao Paulo and Minas Gerais, Brazil were used. For each study, 3045 uncastrated bulls, depending on the number of groups, were selected. On day zero of the study, the procedure was carried out by the method of bloody castration and the animals were treated after this process. The efficacy of ivermectin and abamectin administered via the pour-on (500mcg kg(-1)), subcutaneous (200mcg kg(-1)) as well as the efficacy of abamectin intramuscularly (200mcg kg(-1)) were evaluated. In each experiment, one group of animals was kept as control. The animals were evaluated from the 3rd to the 14th day after castration process/treatment. The efficacy values for both active principles were <= 30% the next day 10 post-treatment (PT), and in five experiments, both ivermectin and abamectin, regardless of the route of administration, were ineffective (0.0%) on the day 10th PT. Based on the results found in this study, conducted in different properties from southeastern Brazil, both ivermectin and abamectin, when used the protocol presented, were considered ineffective in preventing scrotal myiasis in bulls, irrespective of the route of administration and dose used.

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The broad spectrum of endectocides and the easy use mode of their pour-on formulations are factors that have stimulated a higher frequency of use these drugs in cattle. In this study was evaluated the efficacy of ivermectin pour-on using the dose of 500mcgkg(-1), against nematodes in naturally infected cattle from different herds. Twelve calves were brought from each of the four farms selected. All the 48 calves used showed mean of eggs per gram of feces (EPG) greater than 500 considering three consecutive counts. Subsequently, animals from each herd were divided into two groups of six animals each, one treated pour-on with ivermectin 500mcgkg(-1) and other kept as untreated control. Calves were euthanized 14 days after treatment for counting the endoparasites. Ivermectin showed null effect against H. placei in all the herds evaluated. The drug was also ineffective against C. punctata in the herds from Jaboticabal, SP and Formiga, MG, and reached efficacy of 75.8% and 58.4% in herds from Sao Jose do Rio Pardo, SP and Sao Sebastiao do Para so, MG, respectively. Efficacies of 94.2% (Jaboticabal), 0.0% (Sao Jose do Rio Pardo), 94.2% (Formiga) and 39.2% (Sao Sebastiao do Para so) were detectedagainstO. radiatum. Based on these results obtained on the present study, the four populations of Haemonchus placei and Cooperia punctata evaluated were resistant to ivermectin pour-on using a dose of 500mcgkg(-1). Ivermectin-resistant strains of Oesophagostomum radiatum were found in two of the four herds evaluated.