Research Article

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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
02/11/2016
Bos indicus; Early puberty; GWAS; U6 spliceosomal RNA

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 this phenotype were ... more

A.V. Nascimento; M.C. Matos; L.O. Seno; A.R.S. Romero; J.F. Garcia; A.B. Grisolia; A.V. Nascimento; M.C. Matos; L.O. Seno; A.R.S. Romero; J.F. Garcia; A.B. Grisolia
07/14/2016
Body composition; Bos indicus; Candidate gene; Feed efficiency

Feed efficiency and carcass characteristics are late-measured traits. The detection of molecular markers associated with them can help breeding programs to select animals early in life, and to predict breeding values with high accuracy. The objective of this study was to identify polymorphisms in the functional and positional candidate gene NEUROD1 (neurogenic differentiation 1 ... more

P.S.N. de Oliveira; P.C. Tizioto; W. Malago; M.Ldo Nascimento; A.S.M. César; W.J.S. Diniz; M.M. de Souza; D.P.D. Lanna; R.R. Tullio; G.B. Mourão; deA. Mudadu; L.L. Coutinho; L.Cde A. Regitano; P.S.N. de Oliveira; P.C. Tizioto; W. Malago; M.Ldo Nascimento; A.S.M. César; W.J.S. Diniz; M.M. de Souza; D.P.D. Lanna; R.R. Tullio; G.B. Mourão; deA. Mudadu; L.L. Coutinho; L.Cde A. Regitano
06/21/2016
Bos indicus; Carcass quality; Carcass traits

Brahman cattle are important in tropical regions due to their ability to tolerate excessive heat and parasites. However, Brahman cattle exhibit lower carcass quality characteristics when compared to Bos taurus breeds. The objective of this study was to evaluate potential associations between single nucleotide polymorphisms (SNPs) in six candidate genes for carcass quality and ... more

A.M. Royer; C. Shivers; D.G. Riley; M.A. Elzo; M.D. Garcia; A.M. Royer; C. Shivers; D.G. Riley; M.A. Elzo; M.D. Garcia
09/02/2016
Bos indicus; GH4.1; Growth traits; LEPg.978; SNP

Polymorphisms in candidate genes can produce significant and favorable changes in the phenotype, and therefore are useful for the identification of the best combination of favorable variants for marker-assisted selection. In the present study, an assessment to evaluate the effect of 11 single nucleotide polymorphisms (SNPs) in candidate genes on live weight traits of registered Brahman ... more

N. Hernández; J.C. Martínez-González; G.M. Parra-Bracamonte; A.M. Sifuentes-Rincón; N. López-Villalobos; S.T. Morris; F. Briones-Encinia; E. Ortega-Rivas; V.I. Pacheco-Contreras; L.A. Meza-García; N. Hernández; J.C. Martínez-González; G.M. Parra-Bracamonte; A.M. Sifuentes-Rincón; N. López-Villalobos; S.T. Morris; F. Briones-Encinia; E. Ortega-Rivas; V.I. Pacheco-Contreras; L.A. Meza-García
02/26/2019
Bos indicus; GWAS; Nelore; Quality carcass

Many studies have explored variability to select cattle with high genetic potential for economic interest traits. Genetic variability is a powerful tool to improve production indexes in cattle, as it also is associated with variations in meat and carcass quality traits. We made a Genome-Wide Association Study of beef cattle of Bos indicus origin, in ... more

M.E. Carvalho; F.S. Baldi; P.A. Alexandre; M.H.A. Santana; R.V. Ventura; R.S. Bueno; M.N. Bonin; F.M. Rezende; L.L. Coutinho; J.P. Eler; J.B.S. Ferraz
10/22/2002
Beef cattle; Heritability; Selection; Tropics; Weights

(Co)variance components and genetic parameters were estimated for body weights of an elite Brahman herd under a designed, supervised management and genetic program, including strategic artificial insemination (AI). Restricted maximum likelihood methods were used with a univariate animal model for birth weight (BW) and a bivariate model for weaning weight (205-day weight, 205W) and 18 ... more

D. Plasse; O. Verde; J. Arango; L. Camaripano; H. Fossi; R. Romero; C.Rodriguez M.; J.L. Rumbos
03/06/2002
Beef cattle; Covariance functions; Efficiency of growth; Longitudinal data; Optimal size; Random regression models
J.A. Arango; D. Van Vleck
02/27/2004
Adjustment factors; Beef cattle; Genetic evaluation

Age-of-dam adjustment factors are used to preadjust birth and weaning weight data for national beef cattle genetic evaluations. Adjustments are used in order to make the means of the different age-of-dam subclasses similar so that a fair comparison of animals can be performed. A review was made of various research studies that have estimated age-of-dam adjustment factors for birth ... more

J.M. Rumph; D. Van Vleck
04/28/2005
Beef cattle; Feed efficiency; Genetic evaluation

Selection for the wide range of traits for which most beef breed associations calculate expected progeny differences focus on increasing the outputs of the production system, thereby increasing the genetic potential of cattle for reproductive rates, weights, growth rates, and end-product yield. Feed costs, however, represent a large proportion of the variable cost of beef production ... more

D.H.Denny Crews

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