A small proportion of Zebu genetic background in crossbred calves may not be enough to improve resistance against natural bovine Babesia spp. infections.

Autor: Azevedo BT; Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, São Paulo, Brazil., de Oliveira HN; Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, São Paulo, Brazil., Katiki LM; Instituto de Zootecnia, Nova Odessa, São Paulo, Brazil., Filho AEV; Instituto de Zootecnia, Nova Odessa, São Paulo, Brazil., Domingos AG; Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Portugal., Antunes S; Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Portugal., Okino CH; Embrapa Pecuária Sudeste, São Carlos, São Paulo, Brazil., de Sena Oliveira MC; Embrapa Pecuária Sudeste, São Carlos, São Paulo, Brazil., Ibelli AMG; Embrapa Pecuária Sudeste, São Carlos, São Paulo, Brazil., Giglioti R; Instituto de Zootecnia, Nova Odessa, São Paulo, Brazil. Electronic address: rodrigo.giglioti@sp.gov.br.
Jazyk: angličtina
Zdroj: Veterinary parasitology [Vet Parasitol] 2024 Jun; Vol. 328, pp. 110165. Date of Electronic Publication: 2024 Mar 08.
DOI: 10.1016/j.vetpar.2024.110165
Abstrakt: The main objective of cattle breeders in tropical and subtropical regions is to acquire animals with taurine-productive traits adapted to the broad weather range of these regions. However, one of the main challenges on using taurine genetics in these areas is the high susceptibility of these animals to tick-borne diseases. Consequently, the present study evaluated from 10 November 2021-19 April 2022, the over 13 assessments, the Babesia bovis and Babesia bigemina DNA loads and the IgG anti-B. bovis and anti-B. bigemina levels in Angus (n = 17, 100% Taurine) and Ultrablack (n = 14, ∼82% taurine and 18% Zebu) calves. Data were analyzed using a multivariate mixed model with repeated measures of the same animal including the fixed effects of evaluation, genetic group, sex, Babesia spp., and their interactions. The repeatability values were estimated from the (co)variances matrix and expressed for each species. The correlations between the DNA loads (CN log ) and IgG titers (S/P) values for the two species were also estimated using the same model. Regarding the specific IgG antibody titers for both Babesia spp., no significant differences were observed between the two genetic groups. However, for B. bovis and B. bigemina DNA loads, Ultrablack calves presented significantly higher values than Angus calves. Under the conditions evaluated in this study, our findings suggest that the low percentage of Zebu genetic in the Ultrablack breed was insufficient to improve resistance against babesiosis. Further studies must demonstrate if the low percentages of Zebu genetics in Taurine breeds can modify the susceptibility to babesiosis infections.
Competing Interests: Declaration of Competing Interest None of the authors of this study has a financial or personal relationship with other people or organizations that could inappropriately influence or bias the content of the paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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