Research Article

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02/02/2010
Bayesian approach; Beef cattle; Bos indicus; Genetic correlation; Growth traits; Reproduction

Survival or longevity is an economically important trait in beef cattle. The main inconvenience for its inclusion in selection criteria is delayed recording of phenotypic data and the high computational demand for including survival in proportional hazard models. Thus, identification of a longevity-correlated trait that could be recorded early in life would be very useful for selection ... more

M.H. Van Melis; H.N. Oliveira; J.P. Eler; J.B.S. Ferraz; J. Casellas; L. Varona
11/17/2009
Bos indicus; Leptin; Linkage disequilibrium; Markers; UCP1

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 reduced (fixed effects of general mean, contemporary ... more

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. Woodward; D. Nkrumah
01/20/2009
Beef cattle; Bos indicus; Carcass traits; Single nucleotide polymorphisms; Tenderness

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 postmortem. Muscle samples and primal ribs were obtained to measure ... more

T. Smith; M.G. Thomas; T.D. Bidner; J.C. Paschal; D.E. Franke
04/16/2014
Beef cattle; Bos taurus indicus; Molecular markers; Ultrasonographic traits; Weight

The aim of the study was to detect polymorphisms in the leptin gene and to determine the association of these polymorphisms with growth and carcass traits in Nellore cattle. The single nucleotide polymorphisms (SNPs) -1457 (AJ571671:g.-1457A>G) and A59V (AF536174.1:g. 321C>T), as well as the microsatellite BM1500 (3.9 kb downstream), were genotyped. The measures of body weight and ... more

D.B.S. Silva; B.A. Crispim; L.E. Silva; J.A. Oliveira; F. Siqueira; L.O. Seno; A.B. Grisolia
10/21/2008
Bos indicus; Bos taurus; DNA marker; marker-assisted selection; Microsatellite; Nelore

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 was observed in taurine than in zebu ... more

M.A.C. Dani; M.B. Heinneman; S.U. Dani
07/01/2008
Bos indicus; Bos taurus; Guzerat; Mitochondrial DNA; production; Reproduction

The observation of bovine mitochondrial DNA (mtDNA) polymorphisms allows the separation of American zebu cattle, according to its maternal lineage ancestry, into two groups: one with Bos indicus mtDNA and other with Bos taurus mtDNA. The aim of the present study was to determine the productive and reproductive differences between these two groups, in a Guzerat dairy herd. The ... more

J.C.C. Paneto; J.B.S. Ferraz; J.C.C. Balieiro; J.F.F. Bittar; M.B.D. Ferreira; M.B. Leite; G.K.F. Merighe; F.V. Meirelles
10/31/2011
Bos indicus; Cattle genome; Dairy cattle; Daughter design

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 lactose yield was found close to marker MNB66 in three ... more

A.A. Silva; A.L.S. Azevedo; K. Gasparini; R.S. Verneque; M.G.C.D. Peixoto; B.R. Panetto; S.E.F. Guimarães; M.A. Machado
06/01/2010
Bos indicus; Dietary restriction; Growth hormone; Longevity; marker-assisted selection; Thrifty gene

Growth hormone (GH) is a part of the somatotropic axis that controls metabolism, growth, development and aging in a wide range of animals. Mutations that reduce GH signaling have been associated with extended life spans and increased longevity in ways similar to what is observed in dietary restriction (DR) models. However, the mechanism by which DR works is not well understood. Here, we ... more

S.U. Dani; M.A.C. Dani; I.L. Freire; S.P. Gouvea; F.B. Knackfuss; F.P. Lima; M.E.Z. Mercadante; E. Monteiro; S.M.G. Paggiaro; A.G. Razook; H.C. Yehia
08/12/2013
Bos indicus; marker-assisted selection; Molecular breeding value; Protein turnover; Residual feed intake

We looked for possible associations of SNPs in genes related to protein turnover, with growth, feed efficiency and carcass traits in feedlot Nellore cattle. Purebred Nellore bulls and steers (N = 290; 378 ± 42 kg body weight, 23 months ± 42 days old) were evaluated for daily feed intake, body weight gain (BWG), gross feed efficiency, feed conversion ratio, partial efficiency of growth, ... more

R.C. Gomes; S.L. Silva; M.E. Carvalho; F.M. Rezende; L.F.B. Pinto; M.H.A. Santana; T.R. Stella; F.V. Meirelles; R. Júnior; P.R. Leme; J.B.S. Ferraz
12/03/2012
Bos indicus; Insulin-like growth factor; Polymorphisms; Yearling weight

Meat quality is an important trait for the beef industry. Backfat thickness, ribeye area, and shear force are traits measured late in life, and the investigation of molecular markers associated with these traits can help breeding programs. In cattle, some polymorphisms have been related to production traits. Thus, the purpose of this study was to assess the presence of polymorphisms in ... more

P.C. Tizioto; S.L. Meirelles; R.R. Tulio; A.N. Rosa; M.M. Alencar; S.R. Medeiros; F. Siqueira; G.L.D. Feijó; L.O.C. Silva; R.A.A.Torres Júnior; L.C.A. Regitano

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