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Animal Genetics   Research Article

Sire effects on carcass and meat quality traits of young Nellore bulls

Authors: M.N. Bonin, J.B.S. Ferraz, J.P. Eler, F.M. Rezende, D.C. Cucco, M.E. Carvalho, R.C.G. Silva, R.C. Gomes and E.C.M. Oliveira

Meat quality is being increasingly demanded by consumers in recent years. Several factors can affect meat quality, ranging from animal traits such as breed and genetic heritage to pre- and post-slaughter processes. This study investigated the influence of Nellore bulls on carcass and meat quality traits. We used 475 young unca.. Read More»

Genet. Mol. Res. 13(2):
Animal Genetics   Research Article

Expression of immune response genes in peripheral blood of cattle infested with Rhipicephalus microplus

Authors: R. Domingues, S. Wohlres-Viana, D.R.L. Reis, H.C. Teixeira, A.P. Ferreira, S.E.F. GuimarĂ£es, M.C.A. Prata, J. Furlong, R.S. Verneque and M.A. Machado

The bovine tick Rhipicephalus microplus is responsible for severe economic losses in tropical cattle production. Bos indicus breeds are more resistant to tick infestations than are Bos taurus breeds, and the understanding of the physiological mechanisms involved in this difference is important for the development of new method.. Read More»

Genet. Mol. Res. 13(2):
Plant Genetics   Research Article

In-depth pedigree analysis in a large Brazilian Nellore herd

Authors: F.V. Brito1, M. Sargolzaei2,3, J. Braccini Neto1, J.A. Cobuci1, C.M. Pimentel1, J. Barcellos1 and F.S. Schenkel2

A large herd of Nellore cattle was evaluated using in-depth pedigree analyses. Taking into account the incomplete pedigree due to the use of multiple young sires for mating, the average inbreeding coefficient was calculated as 1.73% for the last generation, which was higher than the regular inbreeding coefficient (0.25%). The effective population size was.. Read More»

Genet. Mol. Res. 12(4):
Animal Genetics   Research Article

Genotypic and allelic frequencies of gene polymorphisms associated with meat tenderness in Nellore beef cattle

Authors: M.E. Carvalho, J.P. Eler, M.N. Bonin, F.M. Rezende, F.H. Biase, F.V. Meirelles, L.C.A. Regitano, L.L. Coutinho, J.C.C. Balieiro and J.B.S. Ferraz

The objectives of this study were to characterize the allelic and genotypic frequencies of polymorphisms in the µ-calpain and calpastatin genes, and to assess their association with meat tenderness and animal growth in Nellore cattle. We evaluated 605 Nellore animals at 24 months of age, on average, at slaughter. The pol.. Read More»

Genet. Mol. Res. 16(1):
Animal Genetics   Research Article

Genome wide association study on early puberty in Bos indicus

Authors: A.V. Nascimento1, M.C. Matos2, L.O. Seno3, A.R.S. Romero1, J.F. Garcia4 andA.B. Grisolia1

The aim of this study was to evaluate a genome wide association study (GWAS) approach to identify single nucleotide polymorphisms (SNPs) associated with fertility traits (early puberty) in Nellore cattle (Bos indicus). Fifty-five Nellore cows were selected from a herd monitored for early puberty onset (positive pregnancy at 18 months of age). Extremes of .. Read More»

Genet. Mol. Res. 15(1):
Human Genetics   Research Article

Association of single nucleotide polymorphisms with carcass traits in Nellore cattle

Authors: J.B.S. Ferraz, L.F.B. Pinto, F.V. Meirelles, J.P. Eler, F.M. de Rezende, E.C.M. Oliveira, H.B. Almeida, B. Woodward4 and D. Nkrumah

The association between two single nucleotide polymorphisms (SNPs), T945M and UCP1SNP1, with hot carcass weight (HCW, kg, N = 618), longissimus dorsi muscle area (REA, cm2, N = 633), and backfat thickness (BF, mm, N = 625), measured in Nellore cattle in Brazil, was evaluated. Likelihood ratio tests were used to evaluate reduce.. Read More»

Genet. Mol. Res. 8(4):
Animal Genetics   Research Article

Brazilian Nelore cattle: a melting pot unfolded by molecular genetics

Authors: M.A.C. Dani1, M.B. Heinneman2 and S.U. Dani1

The aim of the present article was to study the population structure and genetic diversity of Nelore cattle and genetic relationships between Nelore and different taurine and zebu breeds raised in Brazil. DNA polymorphism analysis was carried out with 1976 animals of 16 zebu, taurine and synthetic breeds raised in Brazil. A higher genetic differentiation .. Read More»

Genet. Mol. Res. 7(4):
Animal Genetics   Research Article

Association of single nucleotide polymorphisms in the bovine leptin and leptin receptor genes with growth and ultrasound carcass traits in Nellore cattle

Authors: R.C.G. da Silva J.B.S. Ferraz F.V. Meirelles J.P. Eler J.C.C. Balieiro D.C. Cucco E.C. Mattos F.M. Rezende S.L. Silva

Given the important role of leptin in metabolism, we looked for a possible association of leptin and leptin receptor polymorphisms with carcass and growth traits in Nellore cattle. We examined associations of leptin and leptin receptor SNPs with ultrasound carcass (longissimus dorsi muscle area (ribeye area), backfat thickness and rump fat thickness and grow.. Read More»

Genet. Mol. Res. 11(4):
Human Genetics   Research Article

Single nucleotide polymorphisms in Brahman steers and their association with carcass and tenderness traits

Authors: T. Smith M.G. Thomas T.D. Bidner J.C. Paschal D.E. Franke

Data from purebred Brahman steers (N = 467) were used to study the association of single nucleotide polymorphisms (SNP) with carcass traits and measures of tenderness. Fall weaned calves were grazed and fed in a subtropical environment and then harvested for processing in a commercial facility. Carcass data were recorded 24 h .. Read More»

Genet. Mol. Res. 8(1):
Animal Genetics   Research Article

Quantitative trait loci affecting lactose and total solids on chromosome 6 in Brazilian Gir dairy cattle

Authors: A.A. Silva, A.L.S. Azevedo, K. Gasparini, R.S. Verneque, M.G.C.D. Peixoto, B.R. Panetto, S.E.F. GuimarĂ£es and M.A. Machado

Fourteen Brazilian Gir sire families with 657 daughters were analyzed for quantitative trait loci (QTL) on chromosome 6 affecting lactose and total solids. Cows and sires were genotyped with 27 microsatellites with a mean spacing between markers of 4.9 cM. We used a 1% chromosome-wide threshold for QTL qualification. A QTL for.. Read More»

Genet. Mol. Res. 10(4):