Research Article

Related GMR Articles

08/14/2015
broiler; Genetic correlation; Gibbs sampling; Heritability; Liver fat trait; Restricted maximum likelihood

Intensive selection of broilers for improved growth rate is known to exert a negative effect on broiler health, such as an increase in body fat (and its related diseases). Excessive fat deposition in the liver can cause fatty liver hemorrhagic syndrome (FLHS); in addition, traits associated with liver fat have also been associated with FLHS. This study explored the genetic relationships ... more

M.J. Liang; Z.P. Wang; L. Xu; L. Leng; S.Z. Wang; P. Luan; Z.P. Cao; Y.M. Li; H. Li
02/19/2016
Bayesian analysis; Beef cattle; Genetic correlation; Heritability; Postweaning weight gain; Skin thickness

The objective of the present study was to estimate genetic parameters for skin thickness (ST) and postweaning weight gain (PWG550) in Nellore cattle. Records were obtained from 152,392 Nellore animals born between 2001 and 2011. ST was measured in the posterior region of the animal’s scapula with a millimeter caliper. The animals were assigned to different contemporary groups, formed on ... more

A.M. Maiorano; M.C.S. Oliveira; J.N.S.G. Cyrillo; L.G. Albuquerque; R.A. Curi; J.A.I.I.V. Silva; A.M. Maiorano; M.C.S. Oliveira; J.N.S.G. Cyrillo; L.G. Albuquerque; R.A. Curi; J.A.I.I.V. Silva
07/31/2006
Dairy cattle; MOET; Progeny test; Selection; Zebu

Genetic trends for 305-day milk yield (P305) in Brazilian Guzerat herds under selection were compared. Data from 4898 lactations of 3179 purebred and crossbred cows from various regions of Brazil were used. Milk yield was adjusted for mature age and the contemporary groups were defined as herd and calving year. Genetic parameters were estimated using the MTDFREML program. The model included ... more

M.G.C.D. Peixoto; R.S. Verneque; R.L. Teodoro; V.M. Penna; M.L. Martinez
10/31/2011
Bos indicus; Cattle genome; Dairy cattle; Daughter design

Fourteen Brazilian Gir sire families with 657 daughters were analyzed for quantitative trait loci (QTL) on chromosome 6 affecting lactose and total solids. Cows and sires were genotyped with 27 microsatellites with a mean spacing between markers of 4.9 cM. We used a 1% chromosome-wide threshold for QTL qualification. A QTL for lactose yield was found close to marker MNB66 in three ... more

A.A. Silva; A.L.S. Azevedo; K. Gasparini; R.S. Verneque; M.G.C.D. Peixoto; B.R. Panetto; S.E.F. Guimarães; M.A. Machado
12/21/2011
Alternative splicing; Dairy cattle; Lactoferrin gene; Mastitis

Bovine lactoferrin (bLF) is a member of the transferrin family; it plays an important role in the innate immune response. We identified novel splice variants of the bLF gene in mastitis-infected and healthy cows. Reverse transcription-polymerase chain reaction (RT-PCR) and clone sequencing analysis were used to screen the splice variants of the bLF gene in the mammary ... more

J.M. Huang; Z.Y. Wang; Z.H. Ju; C.F. Wang; Q.L. Li; T. Sun; Q.L. Hou; S.Q. Hang; M.H. Hou; J.F. Zhong
08/26/2011
Dairy cattle; Fertility; Growth hormone; IGF-1; Single nucleotide polymorphism

The somatotrophic axis (GH-IGF) is a key regulator of animal growth and development, affecting performance traits that include milk production, growth rate, body composition, and fertility. The aim of this study was to quantify the association of previously identified SNPs in bovine growth hormone (GH1) and insulin-like growth factor 1 (IGF-1) genes with direct ... more

M.P. Mullen; C.O. Lynch; S.M. Waters; D.J. Howard; P. O’Boyle; D.A. Kenny; F. Buckley; B. Horan; M.G. Diskin
05/11/2010
ATP1A1 gene; Dairy cattle; Heat stress; K+-ATPase; Na+; SNP

Heat stress produces oxidative stress and affects the alternation of plasma K+ and Na+. Since Na+,K+-ATPase is sensitive to oxidative stress and critical for maintaining the homeostasis of these two ions, we examined the genetic polymorphism of the ATP1A1 gene in 160 Holstein cows using polymerase chain reaction low ionic strength ... more

Y.X. Liu; X. Zhou; D.Q. Li; Q.W. Cui; G.L. Wang
07/30/2013
Dairy cattle; Lactoferrin; Mastitis; TLR4

Mastitis remains a major cattle disease with great global economic implications. Various approaches are currently employed in attempts to improve understanding of mastitis resistance and develop phenotypic markers for use in breeding programs (e.g., somatic cell score), including QTL discovery, wide-genome association studies, and identification of candidate genes related to immune ... more

A.M. Carvajal; P. Huircan; A. Lepori
08/29/2012
Alternative splicing; C4A gene; Dairy cattle; Mastitis; Transcription pattern

The complement system helps in the direct lysis of invading pathogens and modulates phagocytic, humoral and cellular immune responses. Complement 4 is a critical component in complement activity and protection against many bacterial pathogens because it is essential to classical and lectin activation pathways. We used reverse transcription and PCR to investigate alternative splicing and ... more

Y. Yang; J.M. Huang; Z.H. Ju; Q.L. Li; L. Zhou; R.L. Li; J.B. Li; F.X. Shi; J.F. Zhong; C.F. Wang
06/15/2012
Covariance function; Dairy cattle; Genetic parameters; Milk yield persistency

With the objective of evaluating measures of milk yield persistency, 27,000 test-day milk yield records from 3362 first lactations of Brazilian Gyr cows that calved between 1990 and 2007 were analyzed with a random regression model. Random, additive genetic and permanent environmental effects were modeled using Legendre polynomials of order 4 and 5, respectively. Residual variance was ... more

R.J. Pereira; R.S. Verneque; P.S. Lopes; M.L. Santana; M.R. Lagrotta; R.A. Torres; A.E.Vercesi Filho; M.A. Machado

Pages