Cluster analysis of breeding values for milk yield and lactation persistency in Guzerá cattle
| Title: | Cluster analysis of breeding values for milk yield and lactation persistency in Guzerá cattle |
|---|---|
| Authors: | Cruz, Diego Augusto Campos da, Savegnago, Rodrigo Pelicioni, Santana, Annaíza Braga Bignardi, Peixoto, Maria Gabriela Campolina Diniz, Bruneli, Frank Angelo Tomita, Faro, Lenira El |
| Source: | Ciência Rural. July 2016 46(7) |
| Publisher Information: | Universidade Federal de Santa Maria, 2016. |
| Publication Year: | 2016 |
| Subject Terms: | breeding values, lactation curve, random regression |
| More Details: | 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 different groups according to milk production level and lactation persistency. |
| Document Type: | article |
| File Description: | text/html |
| Language: | English |
| ISSN: | 0103-8478 |
| DOI: | 10.1590/0103-8478cr20150418 |
| Access URL: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701281 |
| Rights: | info:eu-repo/semantics/openAccess |
| Accession Number: | edssci.S0103.84782016000701281 |
| Database: | SciELO |
Be the first to leave a comment!