Consulta: subjectFacets:"Pedigree analysis"
Registros recuperados: 2
Data/hora: 10/06/2024 17:14:59

Structure and genetic variability in Nellore (Bos indicus) cattle by pedigree analysis
Provedor de dados: 74
Autores: Vozzi,Pedro Alejandro; Marcondes,Cíntia Righetti; Magnabosco,Cláudio de Ulhôa; Bezerra,Luiz Antonio Framartino; Lôbo,Raysildo Barbosa.
Parameters based on the probability of gene origin were used to describe the genetic variability in strains of Nellore and polled Nellore (Bos indicus) cattle that participated in the Program for Genetic Improvement of the Nellore Breed (Programa de Melhoramento Genético da Raça Nelore). The effective number of founders was 87.2 for Nellore and 107.9 for polled Nellore, while the number of ancestors was 59.8 for Nellore and 61.5 for polled Nellore and the remaining genomes were 39.4 for Nellore and 34.5 for polled Nellore cattle. The results indicate an intense use (by artificial insemination) of some sires and the absence of subdivisions in the population. The family structure in the two breeds was mainly caused by the genetic contribution of the same...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic drift; Genetic variability matings; Nellore; Pedigree analysis; Probability of gene origin.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300014

Genetic improvement and population structure of the Nelore breed in Northern Brazil
Provedor de dados: 86
Autores: Malhado,Carlos Henrique Mendes; Carneiro,Paulo Luiz Souza; Malhado,Ana Claudia Mendes; Martins Filho,Raimundo; Bozzi,Riccardo; Ladle,Richard James.
The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bos taurus indicus; Effective population size; Genetic parameters; Genetic trends; Inbreeding; Pedigree analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000009