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Genetic associations between temperament and performance traits in Nellore beef cattle
A C Sant'Anna1, F Baldi, T S Valente
1Faculdade de Ciências Agrárias e Veterinárias, UNESP, Jaboticabal, SP, Brazil.
Summary
Selecting Nellore cattle for calmer temperament traits, like flight speed (FS), shows favorable genetic links with performance traits. However, indirect improvements in temperament through selection for growth (ADG) or carcass traits will be minimal.
Area of Science:
- Animal Genetics
- Quantitative Genetics
- Behavioral Genetics
Background:
- Temperament influences animal welfare and productivity.
- Understanding genetic links between temperament and performance is crucial for breeding programs.
Purpose of the Study:
- To estimate genetic associations between various temperament traits and performance traits in Nellore cattle.
- To determine the heritability and genetic correlations for temperament and performance traits.
Main Methods:
- Evaluated four temperament traits: temperament score (TS), movement score (MOV), crush score (CS), and flight speed (FS).
- Assessed performance traits: conformation (C), finishing precocity (P), muscling (M), and average daily gain (ADG).
- Applied Bayesian inference using Gibbs sampling for parameter estimation.
Main Results:
- Heritability estimates for temperament traits ranged from 0.07 (CS) to 0.28 (FS).
- Negative genetic correlations were observed between temperament traits and performance traits (ADG, C, P, M), ranging from -0.02 to -0.31.
- Phenotypic correlations were negative but lower than genetic correlations.
Conclusions:
- Temperament traits assessed have favorable genetic correlations with performance traits in Nellore cattle.
- Indirect selection responses for temperament via selection for ADG or carcass traits (C, P, M) are expected to be low.
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