Now showing items 1-10 of 69
Modeling of average growth curve in Santa Ines sheep using random regression models
(Revista Brasileira de Zootecnia, 2011-02-01) [Artigo]
Funções polinomiais da idade de diferentes ordens foram avaliadas na modelagem da trajetória média de crescimento de ovinos Santa Inês em modelos de regressão aleatória. As análises foram executadas inicialmente desconsiderando ...
Genetic associations of sexual precocity with growth traits and visual scores of conformation, finishing, and muscling in Nelore cattle
(Journal of Animal Science, 2009-05-01) [Artigo]
The objective of this study was to determine the possible use of heifer pregnancy at 16 mo as a selection criterion and its possible genetic associations with hip height, yearling weight, and visual scores of conformation, ...
Multivariate analyses of weight traits fitting reduced rank and factor analytic models in Nellore cattle
(Journal of Dairy Science, 2010-01-01) [Resumo]
Evaluation of an average numerator relationship matrix model and a Bayesian hierarchical model for growth traits in Nellore cattle with uncertain paternity
(Livestock Science, 2012-03-01) [Artigo]
The objective of this work was to compare a model based on the use of an average numerator relationship matrix (ANRM) and a hierarchical animal model (HIER) to indicate the most appropriate statistical procedure to better ...
Genetic associations of conformation, finishing precocity and muscling visual scores with mature weight in Nelore cattle
(Livestock Science, 2011-02-01) [Artigo]
Were estimate (co)variance and genetic associations between conformation, finishing precocity and muscling visual scores measured at weaning (SCW, SFW and SMW, respectively) and yearling (SCY. SFY and SMY, respectively) ...
Selection strategies for dairy buffaloes: economic and genetic consequences
(Journal of Animal Breeding and Genetics, 2012-12-01) [Artigo]
Buffaloes are generally raised in Brazil without milk-recording programs, and thus without genetic evaluations of any of their traits. This study evaluated the economic impacts of three different selection strategies on ...
Study of relations among age at first calving, average weight gains and weights from weaning to maturity in Nellore cattle
(Revista Brasileira de Zootecnia, 2010-04-01) [Artigo]
Dados de 23.120 animais da raça Nelore foram utilizados para estimar herdabilidade e correlações genéticas para a idade ao primeiro parto, o ganho em peso da desmama ao ano e do ano ao sobreano, o peso à desmama, o peso ...
Genotype by environment interaction for birth and weaning weights of composite beef cattle in different regions of Brazil
(Livestock Science, 2012-11-01) [Artigo]
The objectives of the present study were to characterize and define homogenous production environments of composite beef cattle in Brazil in terms of climatic and geographic variables using multivariate exploratory techniques ...
Selection for higher body weight in Nelore cattle is effective in achieving an increase of longissimus muscle area without reducing subcutaneous fat thickness
(Revista Brasileira de Zootecnia, 2012-06-01) [Artigo]
The objectives of this study were to estimate heritabilities and genetic and phenotypic correlations between carcass traits measured by ultrasound and other economically important traits generally used as selection criteria ...
Bayesian inference in genetic parameter estimation of visual scores in Nellore beef-cattle
(Genetics and Molecular Biology, 2009-01-01) [Artigo]
The aim of this study was to estimate the components of variance and genetic parameters for the visual scores which constitute the Morphological Evaluation System (MES), such as body structure (S), precocity (P) and ...