Effect of age of dam on weight of calf in the genetic assessment of Zebu cattle in random regression models

Jorge Luís Ferreira, Fernando Brito Lopes, Tiago Bresolin, José Américo Soares Garcia, Silvia Minharro, Raysildo Barbosa Lôbo

Research output: Contribution to journalArticlepeer-review

Abstract

Current analysis estimated co-variance components and genetic parameters for growth traits by random regression models taking into consideration the cow’s age on the weight of calves. Genealogical data and records on weights of male and female Zebu cattle, born between 1993 and 2011, were provided by the National Association of Breeders and Researchers (ANCP). Different models were compared by Akaike and Bayesian criteria. Legendre’s orthogonal polynomials were used to model the direct and maternal genetic effects of maternal and animal permanent environmental effects. Joint modeling of cow age at the moment their progenies were weighed resulted in more accurate estimates of co-variance components and genetics parameters. Co-variance functions of the cow age retrieved the dam effect on real performance of the progenies, reduced biases, improved parameter estimates and predicted breeding rates.

Original languageEnglish (US)
Pages (from-to)203-208
Number of pages6
JournalActa Scientiarum - Animal Sciences
Volume37
Issue number2
DOIs
StatePublished - 2015
Externally publishedYes

Keywords

  • Co-variance
  • Genetics parameters
  • Progenies
  • Weight
  • Zebu

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology

Fingerprint

Dive into the research topics of 'Effect of age of dam on weight of calf in the genetic assessment of Zebu cattle in random regression models'. Together they form a unique fingerprint.

Cite this