Research Article

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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
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
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
02/03/2009
Beef cattle; Beef quality; Body composition; Brangus; Leptin

Leptin is a hormone that affects the regulation of feed intake, energy balance and body composition in mammals. Several polymorphisms in the bovine leptin gene have been associated with phenotypic variance of these traits. We evaluated two known single nucleotide polymorphisms (SNPs) in the leptin gene of 253 grazing Brangus steers. Brangus is a 5/8 Angus-3/8 Brahman composite. Data were ... more

P.M. Corva; G.V.Fernández Macedo; L.A. Soria; P. Mazzucco; M. Motter; E.L. Villarreal; A. Schor; C.A. Mezzadra; L.M. Melucci; M.C. Miquel
08/16/2012
Beef cattle; Beef quality traits; DNMT3b; SNPs

DNA methylation is essential for adipose deposition in mammals. We screened SNPs of the bovine DNA methyltransferase 3b (DNMT3b) gene in Snow Dragon beef, a commercial beef cattle population in China. Nine SNPs were found in the population and three of six novel SNPs were chosen for genotyping and analyzing a possible association with 16 meat quality traits. The frequencies of ... more

X. Liu; X.Y. Guo; X.Z. Xu; M. Wu; X. Zhang; Q. Li; P.P. Ma; Y. Zhang; C.Y. Wang; F.J. Geng; C.H. Qin; L. Liu; W.H. Shi; Y.C. Wang; Y. Yu
10/30/2015
Beef cattle; Genetic parameter; Greenhouse gas; Prediction equation

The objective of this study was to estimate the heritability of predicted daily enteric methane emissions (PME) from growing Nellore cattle. Dry matter intake (DMI) records of 955 Nellore animals that were born between 2004 and 2013, which were obtained in a postweaning performance test lasting 83 ± 15 days, were used. The PME of each animal, obtained as MJ/day and converted to g/day, was ... more

T.L.P. Sobrinho; M.E.Z. Mercadante; R.C. Canesin; J.N.S.G. Cyrillo; L.G. Albuquerque; R.H. Branco
09/23/2002
Capsicum annuum; Gene action; Heritability; Meloidogyne incognita; Monogenic inheritance; Resistance

Root-knot nematodes of the genus Meloidogyne are important pathogens affecting vegetable crop production in Brazil and worldwide. The pepper species Capsicum annuum includes both hot and sweet peppers; very little emphasis has been placed on breeding sweet peppers for nematode resistance. We report on the inheritance of resistance to Meloidogyne incognita ( ... more

F. de Souza-Sobrinho; W.Roberto Maluf; L.A.A. Gomes; V.Paulo Campos
03/28/2002
Asparagus officinalis L.; Heritability; Parent-offspring regression method; Selective criteria

To estimate the heritability values of characters frequently used as selective criteria, 32 half-sib families obtained from selected plants of three populations of the asparagus variety Argenteüil were evaluated in a randomized complete block design. The following characters were measured: days to emergence of the first spear, number and diameter of spears, number of stalks, plant ... more

V. Cravero; E. Cointry; I. Gatti; F.López Anido
09/30/2004
Carcass traits; Cattle; Heritability; Slaughter end points

We present estimates of heritability for carcass traits of cattle published in the scientific literature. Seventy-two papers published from 1962 to 2004, which reported estimates of heritability for carcass traits, were reviewed. The unweighted means of estimates of heritability for 14 carcass traits by slaughter end point (age, weight, and fat depth) were calculated. Among the three end ... more

A.Ríos Utrera; L.Dale Van Vleck

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