Research Article

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Average daily gain; Beef cattle; Feed efficiency; Genome-wide association study; Nellore; Single nucleotide polymorphism

Weight gain is a key performance trait for beef cat­tle; however, attention should be given to the production costs for better profitability. Therefore, a feed efficiency trait based on per­formance can be an interesting approach to improve performance without increasing food costs. To identify candidate genes and ge­nomic regions associated with residual body weight gain (RWG), we ... more

M.H.A. Santana; R.C. Gomes; Y.T. Utsunomiya; H.H.R. Neves; F.J. Novais; M.N. Bonin; H. Fukumasu; J.F. Garcia; P.A. Alexandre; G.A.Oliveira Junior; L.L. Coutinho; J.B.S. Ferraz
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Bayesian; Beef cattle; Cross breeding; Gibbs sampling; Productive efficiency; Reproductive efficiency

Beef cattle production requires reproductive efficiency. However, measures of reproductive traits are not usually collected; consequently, correlated traits that could be used as indicators would be useful. We examined associations between measures of reproductive and productive efficiency that could be used as selection indicators. Data from 194 dams of the genetic groups Angus x Nelore ... more

L.N. Silva; E. Gasparino; R.A.A.Torres Júnior; E. Filho; L.O.C. Silva; M.M. Alencar; M.D.Souza Júnior; J.V.F. Battistelli; S.C.C. Silva
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Beef cattle; Heritability; Selection; Tropics; Weights

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Beef cattle; Covariance functions; Efficiency of growth; Longitudinal data; Optimal size; Random regression models
J.A. Arango; D. Van Vleck
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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

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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
04/22/2009
Beef cattle; Feed intake; Genetic (co)variances

It is generally accepted that feed intake and growth (gain) are the most important economic components when calculating profitability in a growth test or feedlot. We developed a single post-weaning growth (feedlot) index based on the economic values of different components. Variance components, heritabilities and genetic correlations for and between initial weight (IW), final weight (FW), ... more

R.R. van der Westhuizen; J. van der Westhuizen
03/10/2009
Beef cattle; Genetic and phenotypic correlation; Heritability; Maternal effect; Suizo cattle; Weight gain

The objective of this study was to estimate genetic parameters for pre-weaning traits of Braunvieh cattle raised under tropical conditions in Brazil. The weight and weight gain parameters were birth weight (BW, N = 9955), weight at 120 days of age (W120, N = 5901), weaning weight at 205 days (WW, N = 6970), weight gain from birth to 205 days (GAIN205, N = 6013), weight gain from birth to 120 ... more

D.C. Cucco; J.B.S. Ferraz; L.F.B. Pinto; J.P. Eler; J.C.C. Balieiro; E.C. Mattos
02/25/2009
Beef cattle; Feedlot profitability; Growth efficiency; Post-weaning growth

The aim of this study was to identify factors influencing profitability in a feedlot environment and to estimate genetic parameters for and between a feedlot profit function and productive traits measured in growth tests. The heritability estimate of 0.36 for feedlot profitability shows that this trait is genetically inherited and that it can be selected for. The genetic correlations between ... more

R.R. van der Westhuizen; J. van der Westhuizen; S.J. Schoeman
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

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