Research Article

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Beef cattle; Marker assisted selection; QTL; SNP; Zebu

We analyzed the polymorphisms TFAM HaeIII, TFAM MboI and FABP4 MspA1I in three Nellore lines selected for growth in order to evaluate how selection affects the frequencies of these polymorphisms and evaluate their association with growth and carcass traits in Zebu cattle. Birth, weaning and yearling weights, rump height, longissimus muscle area, backfat ... more

D.R. Ayres; F.R.P. Souza; M.E.Z. Mercadante; L.F.S. Fonseca; H. Tonhati; J.N.S.G. Cyrillo; S.F.M. Bonilha; L.G. Albuquerque
03/23/2010
Beef cattle; Genetic and phenotypic correlations; Heritability; Maternal effect; Swiss cattle; Weight gain

Genetic parameters for traits related to postweaning growth in Braunvieh cattle, reared under tropical and sub-tropical conditions in Brazil, were studied. Weight traits were weight at 365 days of age (W365, N = 4055), at 450 days (W450, N = 3453), and at 550 days (W550, N = 1946), while weight gains were gain from weaning to 365 days of age (WGW365, N = 3060), from weaning to 450 days ( ... more

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01/06/2010
Beef cattle; Genetic evaluation; Longitudinal data; Random regression

Currently, many different data types are collected by beef cattle breed associations for the purpose of genetic evaluation. These data points are all biological characteristics of individual animals that can be measured multiple times over an animal´s lifetime. Some traits can only be measured once on an individual animal, whereas others, such as the body weight of an animal as it grows, ... more

S.E. Speidel; R.M. Enns; D.H. Crews
12/13/2013
Beef cattle; Carcass and meat quality traits; Myf6; MyoD1; PCR-RFLP; Polymorphism

Myogenic determination factor 1 (MyoD1) and myogenic factor 6 (Myf6) genes belong to the myogenic differentiation (MyoD) gene family, which play key roles in growth and muscle development. The study aimed to investigate the effects of variants in cattle MyoD1 and Myf6 on carcass and meat traits. We screened single nucleotide polymorphisms (SNPs ... more

X.H. Du; Q.F. Gan; Z.R. Yuan; X. Gao; L.P. Zhang; H.J. Gao; J.Y. Li; S.Z. Xu
12/19/2012
Bayesian inference; Beef cattle; Fertility; Genetic parameters

We estimated heritability for subsequent rebreeding (SR) of heifers and genetic correlations between this trait and weaning weight (WW), weight gain from weaning to yearling (WG), age at first calving (AFC), and mature cow weight (MW), in order to evaluate whether SR could be included as selection criterion in Nellore cattle. The SR of heifers was defined by attributing a value of 1 ( ... more

A.A. Boligon; F. Baldi; L.G. Albuquerque
08/29/2012
Age at first calving; Beef cattle; Hip height; Scrotal circumference; Weight gain

We investigated genetic associations between mature cow weight (MW) and weaning weight (WW), yearling weight (YW), weight gain from birth to weaning (GBW), weight gain from weaning to yearling (GWY), weaning hip height (WHH), yearling hip height (YHH), scrotal circumference (SC), and age at first calving (AFC). Data from 127,104 Nellore animals born between 1993 and 2006, belonging to ... more

I.C. Regatieri; A.A. Boligon; F. Baldi; L.G. Albuquerque
02/08/2012
Beef cattle; Performance tests; Random regression

The aim of this study was to estimate genetic parameters for body weights of individually fed beef bulls measured at centralized testing stations in South Africa using random regression models. Weekly body weights of Bonsmara bulls (N = 2919) tested between 1999 and 2003 were available for the analyses. The model included a fixed regression of the body weights on fourth-order orthogonal ... more

N.W. Selapa; K.A. Nephawe; A. Maiwashe; D. Norris
09/26/2014
Beef cattle; Gibbs sampling; Monte Carlo method; Threshold models

Finishing precocity visual score selection was adopted to estimate the time from birth to reach slaughter age. This study estimated (co)variance components and genetic correlations for the finishing precocity score at weaning (WP) and yearling (YP) stages by using daily weight gain (BWG = from birth to weaning; WYG = from weaning to yearling) and speed of weight gain (BWR = from birth to ... more

D.M. Everling; T. Bresolin; P.R.N. Rorato; R.O. Araujo; A.A. Boligon; T. Weber; M.A. Dornelles; L.T. Campos
02/21/2014
Beef cattle; Contemporary group; Genetic correlation; Heritability

Data from 69,525 animals were used to compare two types of analyses, one of them having the weaning management group (WEMANG) included as an effect in the contemporary group (F_WEMANG) and the other considering the weaning management group as a random effect, not related to the mathematical model (R_WEMANG) for post-weaning traits. The components of (co)variance were estimated for pre- ... more

V.B. Pedrosa; J.P. Eler; J.B.S. Ferraz; E. Groeneveld
07/25/2014
Beef cattle; Categorical trait; Conformation; Production traits

Records of 17,141 Nellore cattle participating in cattle championships, born from 1994-2009, were used to estimate genetic parameters between animal rank in cattle championships, evaluated from weaning to 36 months of age as repeated traits, and growth, fertility, and carcass traits, evaluated at 365 days of age as single traits. Two traits were defined for animal rank in cattle ... more

E.A.Simielli Filho; M.E.Z. Mercadante; J.A.I.I.Vasconc Silva; L.A. Josahkian

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