Data/hora: 16/06/2024 22:55:25

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 30/11/2016
Data da última atualização: | 07/11/2018
Autoria: | GIGLIOTI, R.; OLIVEIRA, H. N. de; SANTANA, C. H.; IBELLI, A. M. G.; NEO, T. A.; BILHASSI, T. B.; RABELO, M. D.; MACHADO, R. Z.; BRITO, L. G.; OLIVEIRA, M. C. de S.
Afiliação: | Rodrigo Giglioti, UNESP; Henrique Nunes de Oliveira, UNESP; Clarissa Helena Santana, UNESP; ADRIANA MERCIA GUARATINI IBELLI, CNPSA; Thalita Athiê Néo, UFSCAR; Talita Barban Bilhassi, UNESP; MARCIO DIAS RABELO, CPPSE; Rosângela Zacarias Machado, UNESP; LUCIANA GATTO BRITO, CPAF-Rondonia; MARCIA CRISTINA DE SENA OLIVEIRA, CPPSE.
Título: | Babesia bovis and Babesia bigemina infection levels estimated by qPCR in Angus cattle from an endemic area of São Paulo state, Brazil.
Ano de publicação: | 2016
Fonte/Imprenta: | Ticks and Tick-borne Diseases, v. 7, n. 5, p. 657-662, jul. 2016.
ISSN: | 1877-959X
Idioma: | Inglês
Conteúdo: | The levels of infection by Babesia bovis and Babesia bigemina were estimated by absolute quantification through the quantitative PCR technique (qPCR). Fifty-one contemporaneous Angus cattle were evaluated on two occasions. The number of standard female Rhipicephalus microplus ticks present on the left side of the body was counted and blood samples were drawn from the tail vein into tubes containing the anticoagulant EDTA. The blood samples were submitted to DNA extraction and used to quantify the number of copies (NC) of DNA from B. bovis and B. bigemina by qPCR. The data on tick count and number of DNA copies were transformed for normalization and analyzed by a mixed model method. A multivariate model with repeated measures of the same animal, including the effects of collection, parasite species and their interaction, was used. The repeatability values were obtained from the matrix of (co)variances and were expressed for each species. The correlations between the counts of different species on the same animal, in the same collection or different collections, were also estimated. The results showed the qPCR could distinguish the two between infection by the two Babesia species. Infection levels by B. bovis and B. bigemina were detected in 100% and 98% of the animals, respectively. Significant differences were found (P<0.05) between the NC of the two Babesia species, B. bovis 1.49±0.07 vs. B. bigemina 0.82±0.06. Low repeatabilities were found for the counts of R. microplus and NC of B. bovis and B. bigemina: 0.05, 0.10 and 0.02, respectively. The correlations between R. microplus count and NC of B. bovis and B. bigemina were both very near zero. However, an association was observed between the NC of the two species, with a correlation coefficient of 0.30 for measures from the same collection. The absence of associations between the quantity of DNA from B. bovis and B. bigemina and the tick counts suggests that the variation of parasitemia by the hemoparasites did not depend on the tick infestation levels at the moment of each collection. The repeatability values estimated indicate that under the study conditions, the variations in the tick infestation levels and of parasitemia by B. bovis and B. bigemina depend more on factors related to each collection than on intrinsic factors of the animal.
Palavras-Chave: | QPCR; R microplus; Resistance.
Thesagro: | Babesia Bovis; Bovino.
Thesaurus Nal: | babesiosis.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (23900-1) - UPC - AP - DD - PROCI-2016.00140 - GIG - 2016.00189 - DIS