Avaliação da transferência de imunidade passiva em bezerros de vacas da raça Canchim
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Data
2010-02-23
Autores
Rocha, Thaís Gomes [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do estudo foi avaliar a transferência de imunidade passiva (TIP) de vacas Canchim aos seus bezerros. Um grupo experimental foi constituído por 13 vacas primíparas e seus bezerros, e o outro por 13 vacas pluríparas e seus bezerros. Foram coletadas amostras de sangue venoso dos bezerros e secreções lácteas das vacas até 1 hora e 1, 2, 7, 15 e 30 dias após o nascimento/parto. No hemograma, notaram-se alterações características do período neonatal, como redução na contagem de hemácias, teor de hemoglobina e volume globular após a ingestão do colostro, além de aumento na contagem de linfócitos e redução da contagem de neutrófilos segmentados. Os exames bioquímicos séricos revelaram aumento nas atividades de GGT (até 3.746 U/L) e ALP (até 1.030 U/L) e nos teores de proteína total (até 7,77 g/dL), globulinas (até 6,01 g/dL), IgA (até 322 mg/dL) e IgG (até 2.918 mg/dL) após a ingestão do colostro, seguidos por redução gradual nestes parâmetros até os 30 dias de idade. As avaliações bioquímicas das secreções lácteas revelaram alta concentração de todos os componentes colostrais analisados, com redução gradual nos seus teores no decorrer do período experimental, à exceção dos minerais, cujas concentrações oscilaram pouco entre os momentos. A TIP foi eficiente em ambos os grupos de bezerros, e a qualidade das secreções lácteas, embora diferentes entre vacas primíparas e pluríparas, não interferiu na passagem de imunoglobulinas da vaca para o bezerro.
The aim of this study was to evaluate the passive immunity transfer from Canchim cows to its calves. One experimental group comprised 13 primiparous cows and its calves and the other group, 13 multiparous cows and its calves. Samples of calves’ venous blood and cow`s lacteal secretions were collected until 1 hour and 1, 2, 7, 15 and 30 days after birth/parturition. In the hemogram, characteristic alterations of this period, such as reduction in the erytocyte count, hemoglobin concentration and corpuscular volume after colostrum intake and rise in the lymphocyte count and reduction in the neutrophil count were noticed. The serum biochemistry revealed augmentation in the GGT (up to 3,746 U/L) and ALP (up to 1,030 U/L) activities and in the total protein (up to 7.77 g/dL), globulin (up to 6.01 g/dL), IgA (up to 322 mg/dL) and IgG (up to 2,918 mg/dL) concentrations after colostrum intake, followed by a gradual reduction in these parameters until 30 days of age. The biochemical evaluation of the lacteal secretions revealed high concentrations of all the colostral components analysed, with gradual reduction in their concentrations along the experimental period, except for the minerals, which showed little oscillation between the moments. The passive immunity transfer was efficient in both groups of calves, and the quality of the lacteal secretions, although different between primiparous and multiparous cows, did not interfere in the transference of immunoglobulins from the cows to the calves.
The aim of this study was to evaluate the passive immunity transfer from Canchim cows to its calves. One experimental group comprised 13 primiparous cows and its calves and the other group, 13 multiparous cows and its calves. Samples of calves’ venous blood and cow`s lacteal secretions were collected until 1 hour and 1, 2, 7, 15 and 30 days after birth/parturition. In the hemogram, characteristic alterations of this period, such as reduction in the erytocyte count, hemoglobin concentration and corpuscular volume after colostrum intake and rise in the lymphocyte count and reduction in the neutrophil count were noticed. The serum biochemistry revealed augmentation in the GGT (up to 3,746 U/L) and ALP (up to 1,030 U/L) activities and in the total protein (up to 7.77 g/dL), globulin (up to 6.01 g/dL), IgA (up to 322 mg/dL) and IgG (up to 2,918 mg/dL) concentrations after colostrum intake, followed by a gradual reduction in these parameters until 30 days of age. The biochemical evaluation of the lacteal secretions revealed high concentrations of all the colostral components analysed, with gradual reduction in their concentrations along the experimental period, except for the minerals, which showed little oscillation between the moments. The passive immunity transfer was efficient in both groups of calves, and the quality of the lacteal secretions, although different between primiparous and multiparous cows, did not interfere in the transference of immunoglobulins from the cows to the calves.
Descrição
Palavras-chave
Bovino de corte, Colostro, Imunoglobulina A, Imunoglobulina G, Imunidade passiva, Beef cattle, colostrum, Passive immunity, Immunoglobulin A, Immunoglobulin G, SDS-PAGE
Como citar
ROCHA, Thaís Gomes. Avaliação da transferência de imunidade passiva em bezerros de vacas da raça Canchim. 2010. xviii, 108 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2010.