Generalized linear mixed models for the genetic evaluation of binary reproductive traits: a simulation study
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/01/2012
|
Resumo |
The objective of this study was to evaluate the use of probit and logit link functions for the genetic evaluation of early pregnancy using simulated data. The following simulation/analysis structures were constructed: logit/logit, logit/probit, probit/logit, and probit/probit. The percentages of precocious females were 5, 10, 15, 20, 25 and 30% and were adjusted based on a change in the mean of the latent variable. The parametric heritability (h²) was 0.40. Simulation and genetic evaluation were implemented in the R software. Heritability estimates (ĥ²) were compared with h² using the mean squared error. Pearson correlations between predicted and true breeding values and the percentage of coincidence between true and predicted ranking, considering the 10% of bulls with the highest breeding values (TOP10) were calculated. The mean ĥ² values were under- and overestimated for all percentages of precocious females when logit/probit and probit/logit models used. In addition, the mean squared errors of these models were high when compared with those obtained with the probit/probit and logit/logit models. Considering ĥ², probit/probit and logit/logit were also superior to logit/probit and probit/logit, providing values close to the parametric heritability. Logit/probit and probit/logit presented low Pearson correlations, whereas the correlations obtained with probit/probit and logit/logit ranged from moderate to high. With respect to the TOP10 bulls, logit/probit and probit/logit presented much lower percentages than probit/probit and logit/logit. The genetic parameter estimates and predictions of breeding values of the animals obtained with the logit/logit and probit/probit models were similar. In contrast, the results obtained with probit/logit and logit/probit were not satisfactory. There is need to compare the estimation and prediction ability of logit and probit link functions. |
Formato |
52-57 |
Identificador |
http://dx.doi.org/10.1590/S1516-35982012000100008 Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 41, n. 1, p. 52-57, 2012. 1516-3598 http://hdl.handle.net/11449/4391 10.1590/S1516-35982012000100008 S1516-35982012000100008 WOS:000300431700008 S1516-35982012000100008.pdf |
Idioma(s) |
eng |
Publicador |
Sociedade Brasileira de Zootecnia |
Relação |
Revista Brasileira de Zootecnia |
Direitos |
openAccess |
Palavras-Chave | #beef cattle #early pregnancy #genetic parameters #GLMM #link function |
Tipo |
info:eu-repo/semantics/article |