|
|
|
|
| |
|
|
| Cruz,Diego Augusto Campos da; Savegnago,Rodrigo Pelicioni; Santana,Annaíza Braga Bignardi; Peixoto,Maria Gabriela Campolina Diniz; Bruneli,Frank Angelo Tomita; Faro,Lenira El. |
| ABSTRACT: The aim of this study was to explore the pattern of genetic lactation curves of Guzerá cattle using cluster analysis. Test-day milk yields of 5,274 first-lactation Guzerá cows were recorded in a progeny test. A total of 34,193 monthly records were analyzed with a random regression animal model using Legendre polynomials to fit additive genetic and permanent environmental random effects and mean trends. Hierarchical and non-hierarchical cluster analyses were performed based on the EBVs for monthly test-day milk yield, peak yield, lactation persistency, and partial cumulative and 305-day yields. The heritability estimates for test-day milk yields ranged from 0.24 to 0.52. Cluster analysis identified animals in the population that belong to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding values; Lactation curve; Random regression. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701281 |
| |
|
|
| Sarmento,José Lindenberg Rocha; Torres,Robledo de Almeida; Sousa,Wandrick Hauss de; Albuquerque,Lucia Galvão de; Lôbo,Raimundo Nonato Braga; Sousa,José Ernandes Rufino de. |
| Polynomial functions of age of different orders were evaluated in the modeling of the average growth trajectory in Santa Ines sheep in random regression models. Initially, the analyses were performed not considering the animal effect. Subsequently, the random regression analyses were performed including the random effects of the animal and its mother (genetic and permanent environment). The linear fit was lower, and the other orders were similar until near 100 days of age. The cubic function provided the closest fit of the observed averages, mainly at the end of the curve. Orders superior to this one tended to present incoherent behavior with the observed weights. The estimated direct heritabilities, considering the linear fit, were higher to those... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal model; Breeding values; Fixed regression; Hairless sheep; Heritability; Polynomial functions. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200012 |
| |
|
|
|
