Estrutura populacional da raça Nelore Mocho

Faria, F. J. C.; Vercesi, Anı́bal E.; Madalena, F. E.; Josahkian, L. A.

doi:10.1590/s0102-09352002000500008

Cited by 18 publications

(5 citation statements)

References 13 publications

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“…Similar results were obtained with polled Nellore (Faria et al 2002) and the Simental breed (Sölkner et al1998).…”

Section: Discussionsupporting

confidence: 87%

“…The same type of analysis was used in the study of the genetic variability of Brazilian Zebu (Bos indicus) breeds (FJC Faria, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…The considerable increase in kinship between the main sires in the number of endogamous animals born recently (P. A.Vozzi, 2004), and the drop in variability detected by parameters based on the probability of gene origin (FJC Faria, 2002), may be related to different factors such as the prohibition on importation of sires, semen and embryos after 1963, the high genetic contribution of a few sires, the use of reproductive biotechnology and the statistical methods used for estimating genetic parameters and breeding values.…”

Section: Introductionmentioning

confidence: 99%

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Structure and genetic variability in Nellore (Bos indicus) cattle by pedigree analysis

et al. 2006

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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 sires and only mating preferences for descendants of some founders are recorded in either breed. The results suggest that genetic variability needs monitoring in order to avoid the compromise of genetic improvement in economically important traits in the breeding program.

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“…Similar results were obtained with polled Nellore (Faria et al 2002) and the Simental breed (Sölkner et al1998).…”

Section: Discussionsupporting

confidence: 87%

“…The same type of analysis was used in the study of the genetic variability of Brazilian Zebu (Bos indicus) breeds (FJC Faria, 2002).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and genetic variability in Nellore (Bos indicus) cattle by pedigree analysis

et al. 2006

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“…The effective population size (Ne) was estimated to be around 214 animals in average per chromosome, with a confidence interval of 13.5, one generation ago (assuming ≈ 7 years for each generation). This number is higher than the Ne obtained from pedigree records, varying from 98 to 68, calculated from past periods of time (from 1979 to 1998) [ 25 ] and from another study also using pedigree records, that shows Ne to be around 120 for a Brazilian Polled Nelore breed [ 26 ]. We estimated Ne to be higher 10 generations ago (around 270 ± 16.86 animals, in average per chromosome), when the breed was introduced in Brazil.…”

Section: Resultsmentioning

confidence: 63%

Genomic structure and marker-derived gene networks for growth and meat quality traits of Brazilian Nelore beef cattle

et al. 2016

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BackgroundNelore is the major beef cattle breed in Brazil with more than 130 million heads. Genome-wide association studies (GWAS) are often used to associate markers and genomic regions to growth and meat quality traits that can be used to assist selection programs. An alternative methodology to traditional GWAS that involves the construction of gene network interactions, derived from results of several GWAS is the AWM (Association Weight Matrices)/PCIT (Partial Correlation and Information Theory). With the aim of evaluating the genetic architecture of Brazilian Nelore cattle, we used high-density SNP genotyping data (~770,000 SNP) from 780 Nelore animals comprising 34 half-sibling families derived from highly disseminated and unrelated sires from across Brazil. The AWM/PCIT methodology was employed to evaluate the genes that participate in a series of eight phenotypes related to growth and meat quality obtained from this Nelore sample.ResultsOur results indicate a lack of structuring between the individuals studied since principal component analyses were not able to differentiate families by its sires or by its ancestral lineages. The application of the AWM/PCIT methodology revealed a trio of transcription factors (comprising VDR, LHX9 and ZEB1) which in combination connected 66 genes through 359 edges and whose biological functions were inspected, some revealing to participate in biological growth processes in literature searches.ConclusionsThe diversity of the Nelore sample studied is not high enough to differentiate among families neither by sires nor by using the available ancestral lineage information. The gene networks constructed from the AWM/PCIT methodology were a useful alternative in characterizing genes and gene networks that were allegedly influential in growth and meat quality traits in Nelore cattle.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-016-2535-3) contains supplementary material, which is available to authorized users.

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“…Research of the genetic structure of the Brazilian Red Sindhi breed using pedigree records from 1979 to 1998 reported increase in Fst from 0.07 to 5.65% and Fis from 0.30 to 4.74% (Faria et al, 2004). Faria et al (2002), studying the genetic structure of Polled Nelore in Brazil found values of Fst = 0.0056 and Fis = 0.0045. However, the low genetic differentiation observed in the Crioula Lageana population may be underestimated since the inbreeding coefficient, which was based on information from a little-known genealogy, was used to calculate this parameter.…”

Section: Discussionmentioning

confidence: 99%

Population structure of the Brazilian Crioula Lageana cattle (Bos taurus) breed

Pezzini

Mariante

Martins³

et al. 2018

Rev Colomb Cienc Pecu

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Background: The lack of information on population structure is one of the main obstacles to develop breeding and conservation programs for animal genetic resources. Objective: To characterize the population structure of Crioula Lageana cattle breed (Bos taurus) in order to assess its genetic diversity. Methods: Database with information of 1,638 Crioula Lageana animals, collected during 38 years, was analysed using the ENDOG v.4.4 program. Results: Effective population size ranged from 72.53 in complete generations to 143.90 in maximum generations. Inbreeding and Average Relatedness coefficients were 0.34 and 0.91%, respectively. The effective number of founders and ancestors were 29 and 28 animals, respectively, and only ten ancestors were responsible for 50% of the genetic variability of the whole population. The average generation interval was 5.84 years in the paternal line and 7.70 in the maternal one. Wright´s F statistics indicated low Palavras-chave: análise de pedigree, conservação de recursos genéticos animais, diversidade genética, endogamia, raças localmente adaptadas.

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Estrutura populacional da raça Nelore Mocho

Cited by 18 publications

References 13 publications

Structure and genetic variability in Nellore (Bos indicus) cattle by pedigree analysis

Structure and genetic variability in Nellore (Bos indicus) cattle by pedigree analysis

Genomic structure and marker-derived gene networks for growth and meat quality traits of Brazilian Nelore beef cattle

Population structure of the Brazilian Crioula Lageana cattle (Bos taurus) breed

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