Scholarship 24/00355-8 - Genética molecular, Genética quantitativa - BV FAPESP
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Evaluation of resistance to infestation by the Rhipicephalus microplus tick and infections by Babesia bovis and B. bigemina in Canchim calves post-weaning

Grant number: 24/00355-8
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Start date until: May 01, 2024
End date until: April 30, 2025
Field of knowledge:Agronomical Sciences - Animal Husbandry - Genetics and Improvement of Domestic Animals
Principal Investigator:Rodrigo Giglioti
Grantee:Camila Fagionato Agostinho
Host Institution: Instituto de Zootecnia. Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Nova Odessa , SP, Brazil

Abstract

Infestations by the Rhipicephalus microplus tick and babesiosis infections transmitted by this tick vector pose a significant challenge to the utilization of cattle with higher levels of taurine genetic composition. The objective of the present study is to evaluate 50 female Canchim breed cattle for tick infestations and babesia infections for a period of 18 months, starting from weaning. This project will be associated with the FAPESP Regular Grant process number 2022/16262-3, titled "Indicators of resistance to the Rhipicephalus microplus tick and babesiosis in Canchim cattle: new strategies". Two assessments will be conducted for each animal in each season of the year (2024 and 2025). Tick counts will be conducted using two methods: (1) visual counts of all adult females and (2) measurements of tick infestation scores. Infection levels of B. bovis and B. bigemina will be assessed using the qPCR technique. The parasite count data will be analyzed using mixed models, in which the most suitable matrix models will be tested, incorporating repeated measurements over time for each animal. Repeatability estimates and correlations will also be analyzed. The data obtained from the experiments could be utilized in genetic improvement programs for the Canchim breed and could serve as a model for similar studies in other breeds. The results obtained will also enhance the discussion on natural defense mechanisms for controlling these parasites.

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