Genotype by environment interaction for tick resistance of Hereford and Braford beef cattle using reaction norm models

Genetics, Selection, Evolution : GSE
R R MotaFernando Flores Cardoso

Abstract

The cattle tick is a parasite that adversely affects livestock performance in tropical areas. Although countries such as Australia and Brazil have developed genetic evaluations for tick resistance, these evaluations have not considered genotype by environment (G*E) interactions. Genetic gains could be adversely affected, since breedstock comparisons are environmentally dependent on the presence of G*E interactions, particularly if residual variability is also heterogeneous across environments. The objective of this study was to infer upon the existence of G*E interactions for tick resistance of cattle based on various models with different assumptions of genetic and residual variability. Data were collected by the Delta G Connection Improvement program and included 10,673 records of tick counts on 4363 animals. Twelve models, including three traditional animal models (AM) and nine different hierarchical Bayesian reaction norm models (HBRNM), were investigated. One-step models that jointly estimate environmental covariates and reaction norms and two-step models based on previously estimated environmental covariates were used to infer upon G*E interactions. Model choice was based on the deviance criterion information. The best-fi...Continue Reading

References

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Citations

Jul 14, 2017·Animal : an International Journal of Animal Bioscience·R R MotaF F Cardoso
May 10, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Luis-Miguel Chevin, Ary A Hoffmann
Jun 4, 2017·Mammalian Genome : Official Journal of the International Mammalian Genome Society·Lucas L VerardoSimone E F Guimarães
Jan 10, 2018·Frontiers in Cellular and Infection Microbiology·Luïse RobbertseChristine Maritz-Olivier
Dec 29, 2020·PloS One·Marco Antônio PeixotoLeonardo Lopes Bhering

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Software Mentioned

AMC
INTERGEN

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