Genetic Variances
Mostrando 13-24 de 138 artigos, teses e dissertações.
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13. Associations among growth, scrotal circumference, and visual score of beef cattle in performance tests on pasture or in feedlots
ABSTRACT This study aimed to evaluate associations among final weight (FW), average daily gain (ADG), scrotal circumference (SC), and visual score (VS) of beef cattle in performance tests on pasture or in feedlots. Genetic parameters for FW, ADG, SC, and VS of young Nellore bulls performance-tested on pasture or in feedlots were evaluated by mixed model. The
R. Bras. Zootec.. Publicado em: 2017-04
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14. Genetic evaluation of European quails by random regression models
The objective of this study was to compare different random regression models, defined from different classes of heterogeneity of variance combined with different Legendre polynomial orders for the estimate of (co)variance of quails. The data came from 28,076 observations of 4,507 female meat quails of the LF1 lineage. Quail body weights were determined at b
R. Bras. Zootec.. Publicado em: 2012-09
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15. Heteroskedasticity for weaning weight of Charolais-Zebu crossbred calves
The objective of the present study was to analyze models with genetic and/or residual heteroskedasticity for genetic evaluation of the weaning weight of Charolais-Zebu crossbred calves. Weaning weight data from 56,965 crossbred calves were analyzed using animal models with different combinations of genetic and residual heteroskedasticity and/or homoskedastic
Revista Brasileira de Zootecnia. Publicado em: 2012-05
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16. The use of weighted multiple linear regression to estimate QTL-by-QTL epistatic effects
Knowledge of the nature and magnitude of gene effects, as well as their contribution to the control of metric traits, is important in formulating efficient breeding programs for the improvement of plant genetics. Information concerning a genetic parameter such as the additive-by-additive epistatic effect can be useful in traditional breeding. This report des
Genet. Mol. Biol.. Publicado em: 2012
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17. Epistasia em testecrosses de milho / Epistasis in maize testcrosses
Epistasis has been known since the beginning of the genetics studies. However its contribution to genetic variance components and to plant breeding is not well understood. Most of the genetic models designed to study the inheritance of the quantitative traits consider the absence of epistasis although most of these analyses dont provide test for such assumpt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2011
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18. Variacao genetica da producao de latex e incremento do caule em progenies de seringueira.
O presente trabalho e um estudo da variacao genetica em uma progenie de meios-irmaos de seringiera [Hevea brasiliensis (Willd.ex Adr. de Juss.) Mull.Arg.], de clones selecionados fenotipicamente de uma populacao-base introduzida da Malasia. O experimento foi instalado na Estacao Experimental de Votuporanga, SP, em delineamento de blocos ao acaso, com 22 trat
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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19. Avaliacao genetica de progenies em meios-irmaos de seringueira em diferentes regioes do estado de Sao Paulo.
O objetivo do presente trabalho foi avaliar o potencial genetico de progenies de meios-irmaos de seringueira [Hevea brasiliensis (Willd.ex Adr. de Juss.Arg.] em tres diferentes locais do Estado de Sao Paulo. Progenies de 22 genotipos foram obtidas de uma populacao-base introduzida da Malasia. As variaves estudadas foram a producao, avaliada por tres testes p
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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20. Estimativas de componentes de variÃncias e de valores genÃticos para caracterÃsticas de crescimento, reproduÃÃo e habilidade materna em ovinos da raÃa Somalis Brasileira / Estimates of variance components and breeding values for growth, reproductive and maternal traits of Brazilian Somali hair sheep
The aims of this study were to estimate genetic parameters for growth, reproductive and maternal traits and assess the different adjustments of fixed effects in the prediction of breeding values for weight and weight gain at weaning of Brazilian Somali sheep, reared in semi-arid. Data from the NÃcleo de ConservaÃÃo da Embrapa Caprinos e Ovinos, located in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2010
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21. Curves of growth and productivity of Nellore and cross from different biological types in intensive production system / Curvas de crescimento e produtividade de vacas Nelore e cruzadas, de diferentes tipos biológicos, em sistema de produção intensiva
Initially, were analyzed weight-age data from birth to 100 months of age from cows of four genetic groups (G): Nellore (NEL), ½Nellore + ½Canchim (CN), ½Angus +½Nellore (AN) and ½Simmental + ½Nellore (SN), of a experiment carried out at Embrapa Southeast Cattle Research Center, State of São Paulo, Brazil. The animals considered in this study were born
Publicado em: 2010
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22. Effect of data structure on estimates of (co) variances of the weight of breast-in beef cattle, using simulated data / EFEITO DA ESTRUTURA DOS DADOS SOBRE AS ESTIMATIVAS DE (CO)VARIÂNCIAS DE PESO À DESMAMA EM BOVINOS DE CORTE, USANDO DADOS SIMULADOS
The objective was to evaluate the effects of the year (sample size, genealogy and data structure), mother-offspring link proportion (mother-offspring pairs, both with weaning weights), inclusion (M2) or not (M1) of the genetic direct-maternal covariance in the model, the direct-maternal correlation (C) magnitude and the direct and maternal genetic variance r
Publicado em: 2009
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23. EFEITO DA ESTRUTURA DOS DADOS SOBRE AS ESTIMATIVAS DE (CO)VARIÂNCIAS DE PESO À DESMAMA EM BOVINOS DE CORTE, USANDO DADOS SIMULADOS / Effect of data structure on estimates of (co) variances of the weight of breast-in beef cattle, using simulated data
The objective was to evaluate the effects of the year (sample size, genealogy and data structure), mother-offspring link proportion (mother-offspring pairs, both with weaning weights), inclusion (M2) or not (M1) of the genetic direct-maternal covariance in the model, the direct-maternal correlation (C) magnitude and the direct and maternal genetic variance r
Publicado em: 2009
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24. Medidas de persistência da produção de leite em rebanhos Gir Leiteiro utilizando modelos de regressão aleatória / Persistency of milk yield measures in Gyr herds using random regression models
Data comprising 27,000 test-day milk yield (TDMY) records of 3,362 first lactations of Gyr cows calving between 1990 and 2007 were used to compare random regression models for biweekly TDMY and to evaluate persistency of lactation milk yield (PS) measures. Records were analyzed by random regression models (RRM). Random trajectories were fitted by Wilminks (W
Publicado em: 2009