The aim of this study was to obtain genetic parameters for resistance to ticks, gastrointestinal nematodes and Eimeria spp. in Nellore cattle using random regression models through Bayesian inference. Animals were classified as resistant or susceptible for each parasite. Heritability estimates ranged from low to high magnitude (0.07 to 0.30 for resistance to ticks, 0.02 to 0.34 for resistance to gastrointestinal nematodes, and from 0.04 to 0.39 for resistance Eimeria spp.) In general, the posterior means of genetic correlations between resistance characteristics were low while high density intervals were large, and in many cases included zero. Thus, there is genetic variation in resistance traits in Nelore cattle and these may be included in breeding programs. The selection may increase the frequency of resistant animals in any age evaluated in this study.

Tiago Luciano Passafaro, Livia Loiola Santos, Fernanda Santos Sil Raidan, Mariana Mamedes Morais, Juan Pablo Carr Botero, Romário Cerqueira Leite, Fabio Luiz Buran Toral

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetics of Trait Complexes: Disease resistance, , 099, 2014
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