Research Article

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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
05/23/2014
Bos indicus; Bos taurus; Real-time polymerase chain reaction; Tick

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 methods of parasite control. We evaluated ... more

R. Domingues; S. Wohlres-Viana; D.R.L. Reis; H.C. Teixeira; A.P. Ferreira; S.E.F. Guimarães; M.C.A. Prata; J. Furlong; R.S. Verneque; M.A. Machado
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
05/22/2015
Bos indicus; Bos taurus; Loin eye area; Sensory analysis; Shear force; Slaughter weight

We evaluated and compared carcass traits and meat quality in Nellore cattle and F1 crosses between Nellore and Araguaia, where 17 individuals were from the Nellore group and 19 were ½ Nellore and ½ Araguaia crosses. All animals belonged to the same birth season and were raised in pasture systems under the same nutritional, environmental, and management conditions. When the animals ... more

N.V. Costa; C. Aboujaoude; G.S. Vieira; V.V. Paiva; R.A.Moraes Neto; V.S. Gondim; L.R. Alves; M.C.L. Torres; R.C. Antunes
12/10/2002
Bos indicus; Bos taurus; Bovine pituitary Growth hormone gene expression; Recombinant bovine somatotropin

The effects of breed and of recombinant bovine somatotropin (rbST) treatment on growth hormone gene expression were studied in young bulls. The experiment was completely randomized in a [2 x 2]-factorial arrangement, using two levels of rbST (0 or 250 mg/animal/14 days), and two breed groups (Nelore and Simmental x Nelore crossbred). A cDNA encoding Bos indicus growth hormone ... more

S.M.Z. Di Mauro; L.R. Furlan; M.I.T. Ferro; M. Macari; J.A. Ferro
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
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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