Research Article

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01/25/2003
Africanized; Apis mellifera; Effective reproduction; Fertility; Reproduction; Varroa

Varroa destructor reproductive success is considered an important character for determining the resistance of honey bees to this mite parasite. However, most of the published data are not comparable due to the different methods of ascertaining and reporting reproduction. A recently published technique that involves reconstructing mite families in older worker brood gives ... more

M.H. Corrêa-Marques; L.Medina Medina; S.J. Martin; D. De Jong
07/05/2011
Fertility; Genetic association; Hatchability; Heritability; White leghorn

Studies estimating genetic parameters for reproductive traits in chickens can be useful for understanding and improvement of their genetic architecture. A total of 1276 observations of fertility (FERT), hatchability of fertile eggs (HFE) and hatchability of total eggs (HTE) were used to estimate the genetic and phenotypic parameters of 467 females from an F2 population generated by ... more

R.P. Savegnago; M.E. Buzanskas; B.N. Nunes; S.B. Ramos; M.C. Ledur; K. Nones; D.P. Munari
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
05/30/2014
Beef cattle; Censored records; Fertility; Heritability; Reproduction

The continuous trait age at subsequent rebreeding (ASR) was evaluated using survival analysis in Nellore breed cows that conceived for the first time at approximately 14 months of age. This methodology was chosen because the restricted breeding season produces censored data. The dataset contained 2885 records of ASR (in days). Records of females that did not produce calves in the ... more

M.H. Van Melis; L.G.G. Figueiredo; H.N. Oliveira; J.P. Eler; G.J.M. Rosa; M.L. Santana; F.M. Rezende; J.B.S. Ferraz
06/01/2010
Bos indicus; Dietary restriction; Growth hormone; Longevity; marker-assisted selection; Thrifty gene

Growth hormone (GH) is a part of the somatotropic axis that controls metabolism, growth, development and aging in a wide range of animals. Mutations that reduce GH signaling have been associated with extended life spans and increased longevity in ways similar to what is observed in dietary restriction (DR) models. However, the mechanism by which DR works is not well understood. Here, we ... more

S.U. Dani; M.A.C. Dani; I.L. Freire; S.P. Gouvea; F.B. Knackfuss; F.P. Lima; M.E.Z. Mercadante; E. Monteiro; S.M.G. Paggiaro; A.G. Razook; H.C. Yehia
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
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

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