Variabilidade genética de búfalos em rebanho-núcleo com base na análise de pedigree

Marcondes, C. R.; Vozzi, Pedro Alejandro; Cunha, B. R. N.; Lôbo, Raysildo Barbosa; Araújo, Cláudio Vieira de; Marques, J. R. F.

doi:10.1590/s0102-09352010000300027

Cited by 9 publications

(6 citation statements)

References 18 publications

(6 reference statements)

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“…The effective number of founders recorded for the Mediterranean buffalo in this study was close to that found by MARCONDES et al (2010) in study on breeds Murrah and Mediterranean; whose effective number of founder animals and ancestors was 48.…”

Section: Resultssupporting

confidence: 87%

“…In a study with Murrah and Mediterranean buffaloes, as well as with their crosses, MARCONDES et al (2010) found an even lower genetic variability when the first 20 ancestors accounted for 69.10% of all variation in the population.…”

Section: Resultsmentioning

confidence: 94%

“…A more critical situation was found by MARCONDES et al (2010) in herds of Murrah, Mediterranean and their crosses, in which the first ancestor, male and female, were responsible, respectively, for 9.5% and 9.4% of the total variability and the first five ancestors contributed with 41.8 and Ciência Rural, v.42, n.11, nov, 2012.…”

Section: Resultsmentioning

confidence: 99%

“…In spite of few parameters estimated by MALHADO et al (2008) and MARCONDES et al (2010), the information about the population structure of Mediterranean breed raised in Brazil is scarce.…”

Section: Introductionmentioning

confidence: 99%

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Variabilidade genética na raça bubalina Mediterrânea avaliada por meio de análise de pedigree

Neto

Cruz²,

Ramos

et al. 2012

Cienc. Rural

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

“…In spite of few parameters estimated by MALHADO et al (2008) and MARCONDES et al (2010), the information about the population structure of Mediterranean breed raised in Brazil is scarce.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variabilidade genética na raça bubalina Mediterrânea avaliada por meio de análise de pedigree

Neto

Cruz²,

Ramos

et al. 2012

Cienc. Rural

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“…A more critical situation was found by Vercesi Filho et al Marcondes et al (2010), the lower the number of founder animals, the greater the need to monitor inbreeding in the studied herd, seeking control tools or even the introduction of animals without direct relationship with the major ancestors identified in the population.…”

Section: Resultsmentioning

confidence: 90%

Tabapuã breed in Northeastern Brazil: genetic progress and population structure

et al. 2012

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-The objective of this study was to evaluate the history of the Tabapuã breed in Northeastern Brazil by determining its population structure and genetic progress. Pedigree information from animals born in the period between 1965 and 2006 and weight-adjusted data at 205 (W205), 365 (W365) and 550 (W550) days of age for bovines born between 1975 and 2006 were used. The (co)variance components and genetic value were estimated using the application MTDFREML. Also, the software ENDOG was used for pedigree analysis and parameter estimation based on the probabilities of gene origin, inbreeding and average generation interval. The heritability coefficients for direct genetic effects were 0.21±0.03, 0.26±0.04 and 0.36±0.05 for W205, W365 and W550, respectively. During the first 20 years studied, the observed effective size was small. The generation intervals by gametic pathway were: 7.7±3.4 (sire-son), 7.8±3.7 (sire-daughter), 6.9±3.3 (dam-son), 6.8 ± 3.1 (dam-daughter), and mean interval of 7.3±3.4 years. The studied population showed moderate heritability coefficients, whereas the genetic gains based on the studied traits may be higher than those estimated by genetic tendencies. Reduced generation interval, increased effective size and continuous mating control of relatives are important strategies for the genetic progress of the Tabapuã breed in the region.

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Population structure and genetic variability in the Murrah dairy breed of water buffalo in Brazil accessed via pedigree analysis

Malhado

Carneiro

et al. 2012

Trop Anim Health Prod

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The objective of this study was to use pedigree analysis to evaluate the population structure and genetic variability in the Murrah dairy breed of water buffalo (Bubalus bubalis) in Brazil. Pedigree analysis was performed on 5,061 animals born between 1972 and 2002. The effective number of founders (fe) was 60, representing 6.32 % of the potential number of founders. The effective number of ancestors (fa) was 36 and the genetic contribution of the 17 most influent ancestors explained 50 % of the genetic variability in the population. The ratio fe/fa (effective number of founders/effective number of ancestors), which expresses the effect of population bottlenecks, was 1.66. Completeness level for the whole pedigree was 76.8, 49.2, 27.7, and 12.8 % for, respectively, the first, second, third, and fourth known parental generations. The average inbreeding values for the whole analyzed pedigree and for inbreed animals were, respectively, 1.28 and 7.64 %. The average relatedness coefficient between individuals of the population was estimated to be 2.05 %-the highest individual coefficient was 10.31 %. The actual inbreeding and average relatedness coefficient are probably higher than estimated due to low levels of pedigree completeness. Moreover, the inbreeding coefficient increased with the addition of each generation to the pedigree, indicating that incomplete pedigrees tend to underestimate the level of inbreeding. Introduction of new sires with the lowest possible average relatedness coefficient and the use of appropriate mating strategies are recommended to keep inbreeding at acceptable levels and increase the genetic variability in this economically important species, which has relatively low numbers compared to other commercial cattle breeds. The inclusion of additional parameters, such as effective number of founders, effective number of ancestors, and fe/fa ratio, provides better resolution as compared to the inclusion of inbreeding coefficient and may help breeders and farmers adopt better precautionary measures against inbreeding depression and other deleterious genetic effects.

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Variabilidade genética de búfalos em rebanho-núcleo com base na análise de pedigree

Cited by 9 publications

References 18 publications

Variabilidade genética na raça bubalina Mediterrânea avaliada por meio de análise de pedigree

Variabilidade genética na raça bubalina Mediterrânea avaliada por meio de análise de pedigree

Tabapuã breed in Northeastern Brazil: genetic progress and population structure

Population structure and genetic variability in the Murrah dairy breed of water buffalo in Brazil accessed via pedigree analysis

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