Consulta: subjectFacets:"Ali and Schaeffer function"
Registros recuperados: 1
Data/hora: 04/06/2024 18:28:33

Random regression models using different functions to estimate genetic parameters for milk production in Holstein Friesians
Provedor de dados: 65
Autores: Dornelles,Mariana de Almeida; Rorato,Paulo Roberto Nogara; Gama,Luis Telo Lavadinho da; Breda,Fernanda Cristina; Bondan,Carlos; Everling,Dionéia Magda; Michelotti,Vanessa Tomazetti; Feltes,Giovani Luis.
ABSTRACT: The objective of this study was to compare the functions of Wilmink and Ali and Schaeffer with Legendre polynomials in random regression models using heterogeneous residual variances for modeling genetic parameters during the first lactation in the Holstein Friesian breed. Five thousand eight hundred and eighty biweekly records of test-day milk production were used. The models included the fixed effects of group of contemporaries and cow age at calving as covariable. Statistical criteria indicated that the WF.33_HE2, LEG.33_HE2, and LEG.55_HE4 functions best described the changes in the variances that occur throughout lactation. Heritability estimates using WF.33_HE2 and LEG.33_HE2 models were similar, ranging from 0.31 to 0.50. The LEG.55_HE4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ali and Schaeffer function; Classes of residual variance; Lactation curve; Legendre polynomials; Wilmink function.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000901649