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Genetic parameters for resistance to parasites in Nellore cattle through random regression

Tuesday, August 19, 2014: 2:45 PM
Bayshore Grand Ballroom E-F (The Westin Bayshore)
Tiago Luciano Passafaro , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Livia Loiola Santos , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Fernanda Santos Silva Raidan , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Mariana Mamedes Morais , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Juan Pablo Carrera Botero , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Romário Cerqueira Leite , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Fabio Luiz Buranelo Toral , Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
Recorded Presentation (flv)
Abstract Text:

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.

Keywords:

beef cattle

correlation

heritability

resistance

See more of: Variance Components and Indicators of Disease Resistance
See more of: Genetics of Trait Complexes: Disease resistance
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