Abstract
This study purposes to examine the distribution of A2A2 alleles in herds of Curraleiro Pé-Duro (CPD) cattle and test association patterns with geographical and municipal development data. Eight CPD herds were selected from the municipalities of Tocantins State, Brazil. The frequency of the A1 and A2 allele was 40.0 and 60.0%, and the frequencies of genotypes A1A1, A1A2, and A2A2 were 20.0, 39.0, and 41.0%, respectively. Correlation estimates supported that the preferred genotype (A2A2) was mostly present in the relatively higher developed mesoregion (West) (P < 0.05). However, genotypic frequencies varied at random according to human population of municipalities and human development index (P > 0.05). The evaluation of the variability of the β-casein gene polymorphism, coupled with spatially explicit methods (spatial autocorrelation, mantel test, and interpolation procedures), revealed some level of spatial dependency. The results suggest that the production of A2A2 milk in indigenous CPD cattle is feasible. This will depend on the adoption of selection schemes.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We are thankful to the Center for Research and Extension in Animal Genetics and Breeding (NAPGEM) at the Federal University of Tocantins, Araguaina Campus.
Funding
This study was supported by the PROPESQ/UFNT (Public Notice n. 071/2021 and PROCAD/Amazônia) — CAPES/Brazil (Case n. 88881.200559/2018–01, Finance n. 1696/2018).
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MCS, JLF, and JBSF, project idealization and experimental design. ABBS, MHDR, LLN, HDS, RDF, JLF, and MEC, material collection, DNA extraction and quantification, and milk beta-casein tests. MCS, spatial analysis. MCS, JLF, JBSF, FOB, MEC, and RSB, description of material and methods, descriptive statistics, and interpretation of results and discussion of results. MCS, JLF, and JBSF, writing and final review of the article.
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da Silva, M.C., Souza, A.B.B., Ferraz, J.B.S. et al. Variability of the β-casein gene polymorphism in Curraleiro Pé-Duro cattle: a geographical genetics approach. Trop Anim Health Prod 54, 378 (2022). https://doi.org/10.1007/s11250-022-03375-5
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DOI: https://doi.org/10.1007/s11250-022-03375-5