The selection of beef cattle for feed efficiency (FE) traits is very important not only productive and economic but also reduced environmental impact livestock. Considering that FE multifactorial expensive to measure, the aim this study was identify biological functions regulatory genes associated with phenotype.Eight were differentially expressed between high low efficient animals (HFE LFE, respectively). Co-expression analyses identified 34 gene modules which 4 strongly traits. They mainly...

The objectives of this study were to characterize the allelic and genotypic frequencies polymorphisms in µ-calpain calpastatin genes, assess their association with meat tenderness animal growth Nellore cattle.We evaluated 605 Genetics Molecular Research 16 (1): gmr16018957 animals at 24 months age, on average, slaughter.The determined for molecular markers CAPN316, CAPN530, CAPN4751, CAPN4753, UOGACAST1.Analyses 7, 14, 21 days maturation performed samples longissimus thoracis obtained...

To estimate heritability (h2) for yearling heifer pregnancy and to the genetic correlation between scrotal circumference, 18,145 records of Nellore heifers exposed breeding at an age approximately 14 mo 25,466 contemporary young bulls were analyzed. Heifer was considered as a categorical trait, with value 1 (success) assigned that pregnant after rectal palpation 60 d end 90-d season 0 (failure) otherwise. A single-trait animal model two-trait including circumference used. Contemporary groups...

Estimates of (co)variance components and genetic parameters were obtained for birth, 205-d, 365-d weight Nelore cattle in Brazil, using single multiple-trait animal models. Data from the Brazilian Zebu Breeders Association (ABCZ). Records 27,549 calves sired by 587 bulls raised on pasture 57 herds analyzed restricted maximum likelihood fitting an model including direct maternal permanent environmental effects. Single analyses carried out. Heritability estimates effects lower than previous...

The current research was conducted to estimate the heritability coefficients and genetic correlations for performance carcass body composition traits in a single sire broiler line. analyzed were BW at 38 d, ultrasound records of pectoral muscle depth, feed intake, conversion ratio, 42 d. eviscerated BW, breast weight, leg abdominal fat content, heart gizzard liver intestine weight. number observations varied between 4,120 29,040 each trait. (co)variance components, heritability, correlation...

To estimate the heritability for probability that yearling heifers would become pregnant, we analyzed records of 11,487 Nellore animals participated in breeding seasons at three farms Brazilian states São Paulo and Mato Grosso do Sul. All were exposed to a bull age about 14 mo. The pregnancy was as categorical trait, with value 1 (success) assigned diagnosed pregnant by rectal palpation 60 d after end season 90 0 (failure) those not time. heritability, obtained Method R, 0.57 standard error...

Feed intake plays an important economic role in beef cattle, and is related with feed efficiency, weight gain carcass traits. However, the phenotypes collected for dry matter efficiency are scarce when compared other measures such as The use of genomic information can improve power inference studies on these measures, identifying regions that affect phenotypes. This work performed genome-wide association study (GWAS) (DMI) residual (RFI) 720 Nellore cattle (Bos taurus indicus). In general,...

The Montana Tropical® Composite is a recently developed beef cattle population that rapidly expanding in Brazil and other tropical countries. This mainly due to its improved meat quality adaptation climate conditions compared Zebu Taurine breeds, respectively. study aimed investigate the genetic architecture of ultrasound-based carcass traits cattle. Therefore, we estimated variance components parameters performed genome-wide association studies using weighted single-step Genomic Best Linear...

The aim of this study was to describe the population structure, inbreeding and quantify their effect for different weights, Santa Inês sheep. For reason, 6490 data production 17,097 animals in pedigree set were utilized evaluate birth weight (BW), at 60 days (W60) 180 (W180). genetic structure analysis realized by software ENDOG (v.4.6.), resulting some level 21.72% data, being 41.02% maximum value, average 10.74% inbred individuals. 2.33% relatedness 0.73%. effective number ancestors 156...

Scrotal circumference data from 47,605 Nellore young bulls, measured at around 18 mo of age (SC18), were analyzed simultaneously with 27,924 heifer pregnancy (HP) and 80,831 stayability (STAY) records to estimate their additive genetic relationships. Additionally, the possibility that economically relevant traits directly in females could replace SC18 as a selection criterion was verified. Heifer defined observation conceived remained pregnant, which assessed by rectal palpation 60 d....

We examined whether single-nucleotide polymorphisms (SNPs) in the calpain (CAPN) and calpastatin (CAST) genes, described from Bos primigenius taurus, are polymorphic Nellore cattle.We also looked for a possible association of linkage disequilibrium this polymorphism with tenderness longissimus dorsi muscle after 7, 14 21 days postmortem aging 638 purebred bulls.Meat was measured as Warner-Bratzler shear force.Additive dominance effects were tested SNPs three genotypic classes; substitution...

The objective of this study was to evaluate the genetic relationship between postweaning weight gain (PWG), heifer pregnancy (HP), scrotal circumference (SC) at 18 months age, stayability 6 years age (STAY) and finishing visual score (PREC), determine potential these traits as selection criteria for improvement growth reproduction in Nellore cattle. HP defined observation that a conceived remained pregnant, which assessed by rectal palpation 60 days. STAY whether or not cow calved every year...

Abstract Improving nutrient utilization efficiency is essential for livestock, given the current scenario of increasing demand animal protein and sustainable resource use. In this context, understanding biology feed (FE) in beef cattle allows development markers identification selection best animals production. Thus, 98 young Nellore bulls were evaluated FE at end experiment liver samples from six High Feed Efficient (HFE) Low (LFE) collected extraction, digestion analysis by HPLC-MS/MS....

O presente trabalho teve por objetivo desenvolver um modelo bioeconômico para determinação de ponderadores econômicos utilizados em índices seleção programas melhoramento genético bovinos corte.Foi desenvolvido cenário padrão, onde, termos absolutos, as características maior relevância econômica foram o rendimento carcaça, ligadas à fertilidade do rebanho, seguidas pelas peso e ganho último referentes mortalidade.Os valores genético-econômicos obtidos foram, habilidade permanência (HP)...

The objective of the present study was to determine presence genotype by environment interaction (G × E) and characterize phenotypic plasticity birth weight (BW), weaning (WW), postweaning gain (PWG) yearling scrotal circumference (SC) in composite beef cattle using reaction norms model with unknown covariate. animals were born between 1995 2008 on 33 farms located throughout all Brazilian biomes latitude −7° −31°, longitude −40° −63°. contemporary group chosen as environmental descriptor,...

The study of population structure by pedigree analysis is useful to identify important circumstances that affect the genetic history populations. intensive use a small number superior individuals may reduce diversity This situation very common for beef cattle breeds. Therefore, objectives present were analyze and possible inbreeding depression on traits economic interest in Marchigiana Bonsmara breeds test inclusion individual coefficient (Fi) or increases (ΔFi) evaluation model...

The aim of this study was to estimate variance components and identify genomic regions pathways associated with resistance gastrointestinal parasites, particularly Haemonchus contortus, in a breed sheep adapted tropical climate. Phenotypes evaluations were performed verify divided into two categories: i) farm phenotypes, assessing body condition score (BCS), degree anemia assessed by the famacha chart (FAM), fur (FS) feces consistency (FC); ii) lab comprising blood analyses for hematocrit...

O objetivo deste trabalho foi estimar os coeficientes de herdabilidade da idade ao primeiro parto, dias para o parto (DPP), duração gestação (DG) e perímetro escrotal (PE) bem como a correlação genética entre estas características reprodutivas medidas nas fêmeas, na raça Nelore. A avaliada em fêmeas expostas pela primeira vez touro torno 14 meses (IPP14), 26 (IPP26). Foram analisados conjuntos dados que variaram 6.030 94.637 observações. As análises foram processadas utilizandose modelos...

Dados de perímetro escrotal e características reprodutivas medidas na fêmea foram analisados com o objetivo estimar coeficiente herdabilidade cada característica a correlação genética entre as características. Os dados obtidos em 11 fazendas pertencentes uma mesma empresa, situadas nos Estados São Paulo, Mato Grosso do Sul Goiás. componentes variância estimados por máxima verossimilhança restrita utilizando modelo animal bi-característica. Para repetidas, utilizados dois modelos matemáticos:...

The objectives of the current study were to assess feasibility using stayability traits improve fertility Nellore cows and examine genetic relationship among stayabilities at different ages. Stayability was defined as whether a cow calved every year up age 5 (Stay5), 6 (Stay6), or 7 (Stay7) yr more, given that she provided opportunity breed. Data analyzed based on maximum posteriori probit threshold model predict breeding values liability scale, whereas Gibbs sampler used estimate variance...

Studying genetic parameters and changes in Santa Ines sheep is important, because it the commonest breed Brazil. This study obtained data from 37,735 pedigree records of lambs over 12 years (2003-2014) 33 flocks 10 Brazilian States; 11,851 performance were available. (Co)variance components, breeding values estimates by derivative-free restricted maximum likelihood a univariate analysis that included maternal additive permanent environmental effects. Birth weight, weaning weight at 180 days...