Research Article

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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
02/28/2002
Brown Swiss; Crossbreeding; Gir; Growth; Holstein; Jersey

The liveweights of 100 females sired by Holstein (H), Jersey (J) or Brown Swiss (BS) bulls out of Holstein-Friesian x Gir dams of 1/2 to 3/4 Holstein-Friesian fraction were compared. The animals were kept in a single herd under the same management. The data were analyzed separately for four age categories by least squares techniques. The models for cows and heifers older than 18 ... more

R.L. Teodoro; F.E. Madalena
12/11/2007
(Co)variance components; Composite beef cattle; Growth; Montana Tropical®; Tropics

The genetic analysis of composite data is very complicated, mainly because it is necessary to adjust data to the effects of heterosis and breed complementarity, and because there is usually considerable confounding of these data with several other effects, such as contemporary group effects, breed composition of the animal and maternal breed composition, among others. Data on birth weight (n ... more

G.B. Mourão; J.B.S. Ferraz; J.P. Eler; J.C.C. Balieiro; R.S. Bueno; E.C. Mattos; L.G.G. Figueiredo
03/30/2007
Brangus; Carcass; DNA; Growth; Growth hormone; SNP

Sequence polymorphisms in the growth hormone (GH) gene and its transcriptional regulators, Pit-1 and Prop-1, were evaluated for associations with growth and carcass traits in two populations of Brangus bulls Chihuahuan Desert Rangeland Research Center (CDRRC, N = 248 from 14 sires) and a cooperating breeding program (COOP, N = 186 from 34 sires). Polymorphisms were SNP mutations in intron 4 (C ... more

M.G. Thomas; R.M. Enns; K.L. Shirley; M.D. Garcia; A.J. Garrett; G.A. Silver
08/07/2007
Correlation; Genetic; Growth; Heritability

(Co)variance components and genetic parameters were estimated for body weights of a Romosinuano herd located in Sinú Valley, Cordoba, Colombia. Restricted maximum likelihood methods were used with a univariate animal model for birth weight, weaning weight (270 days), 16-month weight (480 days), weaning daily gain, and post-weaning daily gain. Models included random animal direct and maternal ... more

R.M. Sarmiento; J.P. Garcia
03/28/2007
Dog breeds; Growth; Polymorphism; SNP; SOCS2

Suppressor of cytokine signaling 2 (SOCS2) is a negative regulator of growth hormone signaling. The deletion of SOCS2 in mice results in a 30-50% increase in post-natal growth. In an effort to identify polymorphisms in the SOCS2 gene that may be associated with body size in dogs, we characterized the canine SOCS2 gene and analyzed its genetic diversity among small and large dog breeds ... more

G. Rincón; A.E. Young; D.L. Bannasch; J.F. Medrano
07/25/2006
Brahman; Carcass; DNA; Genetic marker; Growth; Growth hormone

Associations of DNA polymorphisms in growth hormone (GH) relative to growth and carcass characteristics in growing Brahman steers (N = 324 from 68 sires) were evaluated. Polymorphisms were an Msp-I RFLP and a leucine/valine SNP in the GH gene as well as a Hinf-I RFLP and a histidine/arginine SNP in transcriptional regulators of the GH gene, Pit-1 and Prop-1. Genotypic frequencies of ... more

V.R. Beauchemin; M.G. Thomas; D.E. Franke; G.A. Silver
09/27/2011
Crossbred cattle; Cubic; Growth; Piecewise; Random regression

Two analyses, cubic and piecewise random regression, were conducted to model growth of crossbred cattle from birth to about two years of age, investigating the ability of a piecewise procedure to fit growth traits without the complications of the cubic model. During a four-year period (1994-1997) of the Australian “Southern Crossbreeding Project”, mature Hereford cows (N = 581) were mated ... more

H.R. Mirzaei; W.S. Pitchford; A.P. Verbyla

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