Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 11
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Bayesian random regression threshold models for genetic evaluation of pregnancy probability in Red Sindhi heifers. Repositório Alice
OLIVEIRA, L. T. de; BONAFÉ, C. M.; SIVA, F. F. e; VENTURA, H. T.; OLIVEIRA, H. R. de; MENEZES, G. R. de O.; RESENDE, M. D. V. de; VIANA, J. M. S..
We proposed a Bayesian random regression threshold model for genetic evaluation of pregnancy probability (PP) in Red Sindhi heifers over different months. Since this breed was recently introduced in Brazil, the age of 14 months usually preconized for Nellore cattle may not reflect the reality of the fertility indicator. In this context, the pregnancy success was evaluated at other ages aiming to understand its genetic variability pattern over time. A total of 4828 phenotyped heifers belong to 657 contemporary groups were used for the analysis. The estimated connectedness was equal to 99.75% considering 6189 individuals in the final pedigree. The random regression threshold models were implemented by combining second, third and fourth order Legendre...
Tipo: Nota Técnica/Nota Científica (ALICE) Palavras-chave: Heifer pregnancy; Legendre polynomials; Prenhez; Novilho; Bos indicus; Gado nelore; Zebu; Pedigree; Genetic heterogeneity.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1077375
Imagem não selecionada

Imprime registro no formato completo
Estimation of (co)variance components and genetic parameters for weights of red-winged tinamou using random regression models R. Bras. Zootec.
Tholon,P.; Queiroz,S.A..
The objective of this work was to determine genetic parameters for body weight of tinamou in captivity. It was used random regression models in analyses of data by considering the direct additive genetic (DA) and permanent environmental effects of the animal (PE) as random effects. Residual variances were modeled by using a fifth-order variance function. The mean population growth curve was fitted by sixth-order Legendre orthogonal polynomials. Direct additive genetic effects and animal environmental permanent effect were modeled by using Legendre polynomials of order two to nine. The best results were obtained by models with orders of fit of 6 for direct additive genetic effect and of order 3 for permanent effect by Akaike information criterion and of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic correlation; Heritability; Legendre polynomials; Tinamou; Wild bird.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400011
Imagem não selecionada

Imprime registro no formato completo
Genetic evaluation of partial growth trajectory of Santa Inês breed using random regression models. Repositório Alice
OLIVEIRA, K. A. P. de; LOBO, R. N. B.; FACO, O..
ABSTRACT - It was evaluated data set of 19,303 weight records of Santa Inês sheep in order to evaluate distinct polynomial functions with different order for better adjustements of fixed and random regressions of growth trajectory and to estimate (co)variances components and genetic parameters of this trajectory. Fixed effects used in analysis were contemporary group, sex and birth type. Ordinary and Legendre polynomials, ranging from two to four orders, were evaluated for fixed regression of average growth trajectory. Legendre and quadratic b-spline functions, ranging from three to four orders, were evaluated for random regressions. Legendre polynomials of order fourth were suitable to fit random regression, while ordinary polynomials of third order were...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Polinômios de Legendre; Polinômio ordinário; Ovino; Raça Santa Inês; Correlação genética; Genética animal; Herdabilidade; Melhoramento genético animal; Brasil; Crescimento; Regressão aleatória; Sheep; Genetic correlation; Heritability; Legendre polynomials; Animal genetics; Brazil.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/858176
Imagem não selecionada

Imprime registro no formato completo
Genetic evaluation of partial growth trajectory of Santa Inês breed using random regression models R. Bras. Zootec.
Oliveira,Kassiana Adriano Pinto de; Lôbo,Raimundo Nonato Braga; Facó,Olivardo.
It was evaluated data set of 19,303 weight records of Santa Inês sheep in order to evaluate distinct polynomial functions with different order for better adjustements of fixed and random regressions of growth trajectory and to estimate (co)variances components and genetic parameters of this trajectory. Fixed effects used in analysis were contemporary group, sex and birth type. Ordinary and Legendre polynomials, ranging from two to four orders, were evaluated for fixed regression of average growth trajectory. Legendre and quadratic b-spline functions, ranging from three to four orders, were evaluated for random regressions. Legendre polynomials of order fourth were suitable to fit random regression, while ordinary polynomials of third order were the best...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Β-spline functions; Genetic correlation; Heritability; Legendre polynomials; Ordinary polynomials.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000500013
Imagem não selecionada

Imprime registro no formato completo
Genetic parameters for faecal egg count, packed-cell volume and body-weight in Santa Inês lambs Genet. Mol. Biol.
Lôbo,Raimundo N.B.; Vieira,Luiz S.; Oliveira,Amaury A. de; Muniz,Evandro N.; Silva,José M. da.
Worm infection is one of the main factors responsible for economic losses in sheep breeding in Brazil. Random regression analysis was used to estimate genetic parameters for the factors faecal egg-count (FEC), packed-cell volume (PCV) and body weight (BW) in Santa Inês lambs. Data from 119 female, offspring of nine rams, were collected between December, 2005 and December, 2006, from the experimental flock of Embrapa Tabuleiros Costeiros, the Brazilian Agricultural Research Corporation located in Frei Paulo, SE, Brazil. After weaning, females were drenched until the faecal egg count had dropped to zero. Two natural challenges were undertaken. FEC heritability was extremely variable, this increasing from 0.04 to 0.27 in the first challenge and from 0.01 to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic correlations; Heritability; Legendre polynomials; Random regression.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200014
Imagem não selecionada

Imprime registro no formato completo
Persistence in milk, fat and protein production of primiparous Holstein cows by random regression models R. Bras. Zootec.
Biassus,Igor de Oliveira; Cobuci,Jaime Araújo; Costa,Claudio Napolis; Rorato,Paulo Roberto Nogara; Braccini Neto,José; Cardoso,Leandro Lunardini.
Total numbers of 56,508, 35,091 and 8,326 records of milk, fat, and protein test-day yields, respectively, were used to estimate genetic parameters for six persistency measures on milk, fat and protein productions of Holstein cows reared in Minas Gerais state. Covariance components for additive genetic effects and permanent environmental effects were estimated by REML in random regression models using Legendre polynomials from the third to the sixth order. Overall, models with the highest orders of Legendre polynomials showed the best quality of adjustments of these productive records. Heritability estimates obtained by the models for persistence in milk, fat, and protein yields ranged from 0.04 to 0.32, from 0.00 to 0.23, and from 0.00 to 0.27,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic correlation; Heritability; Legendre polynomials; Random regression model; Selection.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001200009
Imagem não selecionada

Imprime registro no formato completo
Random regression models for the estimation of genetic and environmental covariance functions for growth traits in Santa Ines sheep. Repositório Alice
SARMENTO, J. L. R.; TORRES, R. A.; SOUSA, W. H.; LOBO, R. N. B.; ALBUQUERQUE, L. G.; LOPES, P. S.; SANTOS, N. P. S.; BIGNARD, A. B..
Abstract: Polynomial functions of different orders were used to model random effects associated with weight of Santa Ines sheep from birth to 196 days. Fixed effects included in the models were contemporary groups, age of ewe at lambing, and fourth-order Legendre polynomials for age to represent the average growth curve. In the random part, functions of different orders were included to model variances associated with direct additive and maternal genetic effects and with permanent environmental effects of the animal and mother. Residual variance was fitted by a sixth-order ordinary polynomial for age. The higher the order of the functions, the better the model fit the data. According to the Akaike information criterion and likelihood ratio test, a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Raça Santa Inês; Correlação genética; Growth traits; Legendre polynomials; Polinômio ordinário; Polinômios de Legendre; Growth curve; Ovino; Melhoramento genético animal; Genética animal; Parâmetro genético; Curva de crescimento; Sheep; Genetic correlation; Genetic parameters.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1047794
Imagem não selecionada

Imprime registro no formato completo
Random regression models using different functions to estimate genetic parameters for milk production in Holstein Friesians Ciência Rural
Dornelles,Mariana de Almeida; Rorato,Paulo Roberto Nogara; Gama,Luis Telo Lavadinho da; Breda,Fernanda Cristina; Bondan,Carlos; Everling,Dionéia Magda; Michelotti,Vanessa Tomazetti; Feltes,Giovani Luis.
ABSTRACT: The objective of this study was to compare the functions of Wilmink and Ali and Schaeffer with Legendre polynomials in random regression models using heterogeneous residual variances for modeling genetic parameters during the first lactation in the Holstein Friesian breed. Five thousand eight hundred and eighty biweekly records of test-day milk production were used. The models included the fixed effects of group of contemporaries and cow age at calving as covariable. Statistical criteria indicated that the WF.33_HE2, LEG.33_HE2, and LEG.55_HE4 functions best described the changes in the variances that occur throughout lactation. Heritability estimates using WF.33_HE2 and LEG.33_HE2 models were similar, ranging from 0.31 to 0.50. The LEG.55_HE4...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ali and Schaeffer function; Classes of residual variance; Lactation curve; Legendre polynomials; Wilmink function.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000901649
Imagem não selecionada

Imprime registro no formato completo
Reliability of breeding values between random regression and 305-day lactation models PAB
Padilha,Alessandro Haiduck; Cobuci,Jaime Araujo; Daltro,Darlene dos Santos; Braccini Neto,José.
Abstract The objective of this work was to verify the gain in reliability of estimated breeding values (EBVs), when random regression models are applied instead of conventional 305-day lactation models, using fat and protein yield records of Brazilian Holstein cattle for future genetic evaluations. Data set contained 262,426 test-day fat and protein yield records, and 30,228 fat and protein lactation records at 305 days from first lactation. Single trait random regression models using Legendre polynomials and single trait lactation models were applied. Heritability for 305-day yield from lactation models was 0.24 (fat) and 0.17 (protein), and from random regression models was 0.20 (fat) and 0.21 (protein). Spearman correlations of EBVs, between lactation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding value; Correlation; Legendre polynomials; Reliability.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016001101848
Imagem não selecionada

Imprime registro no formato completo
Weight evaluation of Tabapuã cattle raised in northeastern Brazil using random-regression models Arq. Bras. Med. Vet. Zootec.
Oliveira,M.R.; Azevêdo,D.M.; Malhado,C.; Pires,L.; Martins Filho,R.; Sousa Júnior,S..
ABSTRACT The objective of this study is to compare random-regression models used to describe changes in evaluation parameters for growth in Tabapuã bovine raised in the Northeast of Brazilian. The M4532-5 random-regression model was found to be best for estimating the variation and heritability of growth characteristics in the animals evaluated. Estimates of direct additive genetic variance increased with age, while the maternal additive genetic variance demonstrated growth from birth to up to nearly 420 days of age. The genetic correlations between the first four characteristics were positive with moderate to large ranges. The greatest genetic correlation was observed between birth weight and at 240 days of age (0.82). The phenotypic correlation between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age; Covariance functions; Growth curve; Legendre polynomials; Livestock.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000200457
Imagem não selecionada

Imprime registro no formato completo
Weight evaluation of Tabapuã cattle raised in northeastern Brazil using random-regression models - Avaliação do peso de bovinos Tabapuã criados no Nordeste do Brasil utilizando-se modelos de regressão aleatória. Repositório Alice
OLIVEIRA, M. R.; AZEVEDO, D. M. M. R.; MALHADO, C.; PIRES, L.; MARTINS FILHO, R.; SOUSA JÚNIOR, S. C. de..
bitstream/item/169239/1/ABMVZ-2017-V69-TABAPUA-DOI-DANIELLE.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Age; Covariance functions; Growth curve; Legendre polynomials; Livestock.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1082855
Registros recuperados: 11
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional