Genotype by environment interaction for fat and protein yields via reaction norms in Holstein cattle of southern Brazil

Our objective was to evaluate the genetic merit of Holstein cattle population in southern Brazil in response to variations in the regional temperature by analyzing the genotype by environment interaction using reaction norms. Fat yield (FY) and protein yield (PY) data of 67 360 primiparous cows were...

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Bibliographic Details
Published in:Journal of dairy research 2021-02, Vol.88 (1), p.16-22
Main Authors: Mulim, Henrique Alberto, Carneiro, Paulo Luiz Souza, Malhado, Carlos Henrique Mendes, Pinto, Luís Fernando Batista, Mourão, Gerson Barreto, Valloto, Altair Antônio, Pedrosa, Victor Breno
Format: Article
Language:English
Subjects:
Algorithms
Animal populations
Animals
Cattle
Dairy cattle
Environmental gradient
Genotype & phenotype
Genotype-environment interactions
Genotypes
Heritability
Maximum likelihood method
Milk
Norms
Population
Proteins
Regression analysis
Regression models
Reproductive technologies
Software
Temperature effects
Temperature gradients
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Summary:Our objective was to evaluate the genetic merit of Holstein cattle population in southern Brazil in response to variations in the regional temperature by analyzing the genotype by environment interaction using reaction norms. Fat yield (FY) and protein yield (PY) data of 67 360 primiparous cows were obtained from the database of the Paraná Holstein Breeders Association, Brazil (APCBRH). The regional average annual temperature was used as the environmental variable. A random regression model was adopted applying mixed models with Restricted Maximum Likelihood (REML) algorithm using WOMBAT software. The genetic merit of the 15 most representative bulls, depending on the temperature gradient, was evaluated. Heritability ranged from 0.21 to 0.27 for FY and from 0.14 to 0.20 for PY. The genetic correlation observed among the environmental gradients proved to be higher than 0.80 for both traits. Slight reranking of bulls for both traits was detected, demonstrating that non-relevant genotype by environment interaction for FY and PY were observed. Consequently, no inclusion of the temperature effect in the model of genetic evaluation in southern Brazilian Holstein breed is required.
ISSN:0022-0299
1469-7629
DOI:10.1017/S0022029921000029