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Accuracy of genomic selection predictions for hip height in Brahman cattle using different relationship matrices PAB
Farah,Michel Marques; Fortes,Marina Rufino Salinas; Kelly,Matthew; Porto-Neto,Laercio Ribeiro; Meira,Camila Tangari; Carreño,Luis Orlando Duitama; Fonseca,Ricardo da; Moore,Stephen Stewart.
Abstract: The objective of this work was to evaluate the effects of genomic information on the genetic evaluation of hip height in Brahman cattle using different matrices built from genomic and pedigree data. Hip height measurements from 1,695 animals, genotyped with high-density SNP chip or imputed from 50 K high-density SNP chip, were used. The numerator relationship matrix (NRM) was compared with the H matrix, which incorporated the NRM and genomic relationship (G) matrix simultaneously. The genotypes were used to estimate three versions of G: observed allele frequency (HGOF), average minor allele frequency (HGMF), and frequency of 0.5 for all markers (HG50). For matrix comparisons, animal data were either used in full or divided into calibration (80%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bos indicus; Beef cattle; Genomics; Rare alleles.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600717
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Genetic diversity of Brazilian Brahman cattle by pedigree analysis PAB
Cavani,Ligia; Silva,Rafael Medeiros de Oliveira; Carreño,Luis Orlando Duitama; Ono,Rafael Keith; Bertipaglia,Tássia Souza; Farah,Michel Marques; Millen,Danilo Domingues; Fonseca,Ricardo da.
Abstract: The objective of this work was to evaluate the genetic diversity of Brahman cattle in Brazil with pedigree analysis. Genealogical records of a subpopulation were used considering all pedigree information (Pt) and the pedigree information divided into two periods (P1, from 1994 to 2004; and P2, from 2005 to 2012) or according to the raising system (Ppt, animals on pasture; or Pst, on stable). Estimates were obtained for average inbreeding coefficients, generation intervals (GI), number of equivalent known generation (CGE), number of founders (Nf), effective number of founders (fe), effective number of ancestors (fa), and founder genome equivalents (fg). The average inbreeding coefficients were 11.97, 7.79, 11.95, 11.74, and 11.31% for Pt, P1, P2,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle; Founders; Genetic bottleneck; Inbreeding.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100074
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Impact of reproductive and productive rates on levels of inbreeding and genetic gain of pigs through data simulation R. Bras. Zootec.
Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Breda,Fernanda Cristina; Freitas,Marcelo Silva de; Farah,Michel Marques; Carreño,Luis Orlando Duitama; Oliveira,Mauricio Morgado de.
ABSTRACT The objective of this study was to evaluate the impact of farrowing and mortality rates on inbreeding levels and genetic gain through data simulation. Data came from two real populations A and B, composed of Pietrain and Landrace breed pigs, respectively. To generate the simulated populations, a Fortran-language simulator was developed using the (co)variances of the breeding values and productive and reproductive information obtained from populations A and B, as well as restrictions on mating and animals selected per generation. Two data files were created. The first contained the pedigree of the previous 10 years, with 21,906 and 251,343 animals in populations A and B, respectively. The second included the breeding values for age, backfat...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Farrowing rate; Mortality rate; Viability of piglets.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100306
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Estimates of genetic parameters for visual scores and their correlation with production and reproductive traits in Brahman cattle R. Bras. Zootec.
Bertipaglia,Tássia Souza; Carreño,Luis Orlando Duitama; Machado,Carlos Henrique Cavallini; Andrighetto,Cristiana; Fonseca,Ricardo da.
The objective of this study was to evaluate the association of visual scores of body structure, precocity and muscularity with production (body weight at 18 months and average daily gain) and reproductive (scrotal circumference) traits in Brahman cattle in order to determine the possible use of these scores as selection criteria to improve carcass quality. Covariance components were estimated by the restricted maximum likelihood method using an animal model that included contemporary group as fixed effect. A total of 1,116 observations of body structure, precocity and muscularity were used. Heritability was 0.39, 043 and 0.40 for body structure, precocity and muscularity, respectively. The genetic correlations were 0.79 between body structure and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Average daily gain; Body weight at 18 months; Genetic correlation; Heritability; Scrotal circumference.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600013
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