Reaction norm model to describe environmental sensitivity in Girolando cattle
•Changes in the environmental gradient may cause changes in the ranking of bulls and dams.•There is significant interaction between environment genotype in milk production in Girolando cattle in Brazil.•Estimates of the breeding values and heritabilities of Girolando cattle increase with environment...
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Veröffentlicht in: | Livestock science 2022-09, Vol.263, p.105025, Article 105025 |
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Zusammenfassung: | •Changes in the environmental gradient may cause changes in the ranking of bulls and dams.•There is significant interaction between environment genotype in milk production in Girolando cattle in Brazil.•Estimates of the breeding values and heritabilities of Girolando cattle increase with environmental improvement.•Possibilities of genetic gains in the selection and use of genotypes in medium and high management environments.
The aim was to identify the effect of the genotype-environment interaction (GEI) for test-day milk yield (TMDY) in Girolando cows. Data were a total of 614,580 observations from 87,395 first-lactation cows between 2000 and 2014. The animal model (MA) and reaction standard hierarchical models were adjusted with homogeneous and heterogeneous variances in one step (MMRA1p-T-Ho and MMRA1p-T-He, respectively) and two steps (MMNR2p-T-Ho and MMNR2p-T-He, respectively), both with Student's t-distribution. These different models were compared using three goodness-of-fit criteria: deviance information criterion (DIC), deviance based on the Conditional Predictive Ordinate (CPO), and deviance based on the Bayes factors (BF). The MMRA1p-T-Ho, MMNR2p-T-Ho, and MMNR2p-T-He models presented the lowest values for the DIC (75,662.12), CPO (76,276.89), and BF (71,950.11), respectively, indicating good quality-of-fit. Estimates of mean posterior heritability were low to high (0.06 to 0.84) for TMDY. The genetic correlations along the environmental gradient for TDMY showed low to high values (−0.40 to 1.00). The results indicated a presence of GEI Girolando animals, suggesting the possibility of its inclusion in genetic evaluations performed in Brazil. |
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ISSN: | 1871-1413 1878-0490 |
DOI: | 10.1016/j.livsci.2022.105025 |