A5058230865- Genetic and phenotypic traits in livestock
- Animal Genetics and Reproduction
- Effects of Environmental Stressors on Livestock
- Genetic Mapping and Diversity in Plants and Animals
- Meat and Animal Product Quality
- Rural Development and Agriculture
- Genetics and Plant Breeding
- Ruminant Nutrition and Digestive Physiology
- Livestock Management and Performance Improvement
- Animal Nutrition and Physiology
- Aquaculture Nutrition and Growth
- Reproductive Physiology in Livestock
- Agricultural and Food Sciences
- Vector-Borne Animal Diseases
- Helminth infection and control
- Cancer-related molecular mechanisms research
- Milk Quality and Mastitis in Dairy Cows
- Soil Management and Crop Yield
- Vector-borne infectious diseases
- T-cell and Retrovirus Studies
- Livestock and Poultry Management
- Fish biology, ecology, and behavior
- Agroforestry and silvopastoral systems
- Animal Behavior and Welfare Studies
- Insect Pest Control Strategies
Brazilian Agricultural Research Corporation
2011-2022
Universidade Federal de Lavras
2019
National Council for Scientific and Technological Development
1999-2014
Universidade do Tocantins
2011
Universidade Federal do Tocantins
2011
Agricultural Research Corporation
2005-2010
Institute of Animal Science and Pastures
2005
Meat from Bos taurus and indicus breeds are an important source of nutrients for humans intramuscular fat (IMF) influences its flavor, nutritional value impacts human health. Human consumption that contains high levels monounsaturated fatty acids (MUFA) can reduce the concentration undesirable cholesterol (LDL) in circulating blood. Different feeding practices genetic variation within between amount IMF acid (FA) composition meat. However, it is difficult costly to determine composition,...
Meat quality traits are economically important because they affect consumers' acceptance, which, in turn, influences the demand for beef. However, selection to improve meat is limited by small numbers of animals on which tenderness can be evaluated due cost performing shear force analysis and resultant damage carcass. Genome wide-association studies Warner-Bratzler measured at different times aging, backfat thickness, ribeye muscle area, scanning parameters [lightness, redness (a*),...
Studies are being conducted on the applicability of genomic data to improve accuracy selection process in livestock, and genome-wide association studies (GWAS) provide valuable information enhance understanding genetics complex traits. The aim this study was identify regions genes that play roles birth weight (BW), weaning adjusted for 210 days age (WW), long-yearling 420 (LYW) Canchim cattle. GWAS were performed by means Generalized Quasi-Likelihood Score (GQLS) method using genotypes from...
The development of linkage disequilibrium (LD) maps and the characterization haplotype block structure at population level are useful parameters for guiding genome wide association (GWA) studies, understanding nature non-linear between phenotypes genes. elucidation can reduce information several single nucleotide polymorphisms (SNP) into a block, reducing number SNPs in coherent way consideration GWA genomic selection studies. maximum average LD, measured by r2 varied 0.33 to 0.40 distance <...
This study evaluated the resistance of cattle different genetic groups to tick Rhipicephalus microplus and relationship with traits animals' hair coat. Cows Senepol×Nelore (SN), Angus×Nelore (AN) Nelore (NX) were submitted four consecutive artificial infestations, at 14-day intervals, each one approximately 20,000 larvae placed on lumbar region. From 19th 23rd day infestation five counts number ticks performed animal's left body side. The count data (TTC) transformed into log(10) (n+1), also...
The Canchim beef cattle (5/8 Charolais + 3/8 Zebu) has been selected for meat production in Brazil since late 1950. In the present work effects of growth hormone (GH) and insulin-like factor 1 (IGF-1) polymorphisms were investigated 688 animals born between 1998 2000. These belonged to two genetic groups, i.e., traditional new lineages. Genotype on expected breeding values birth weight (BW), weaning (WW) yearling (YW) by least square method. Significant found GH genotype YW (p < 0.05), with...
Stayability is a trait that has large impact on the costs of rural properties because it directly related to cow's ability produce certain number calves over given period time. Thus, objective this study was estimate genetic variance stayability (STAY) and its associations with age at first calving (AFC), body weight males females 420 days (BW420), scrotal circumference (SC420), in order provide support for evaluation program Canchim beef cattle. Genetic parameters were estimated by Bayesian...
Foram avaliados 27.523 e 21.746 registros das características conformação, precocidade musculatura à desmana ao sobreano, respectivamente, para estimar os componentes de covariância entre estas pesos corporais medidos nas mesmas idades. Para as análises dos dados, foram empregados modelos animais com efeitos genéticos direto materno efeito ambiente permanente materno. Máxima verossimilhança restrita foi empregada parâmetros genéticos. As estimativas herdabilidade escores desmama 0,13; 0,25...
The objective of this study was to investigate the presence genotype × environment interactions (G×E) for long-yearling weight in Canchim cattle (5/8 Charolais + 3/8 zebu) Brazil using reaction norms (RN). hierarchical RN model included fixed effect age animal (linear coefficient) and random effects contemporary groups additive genetic intercept slope group as effects. Contemporary most elemental representation management conditions beef were chosen represent environmental covariate RN....
Phenotypic data from female Canchim beef cattle were used to obtain estimates of genetic parameters for reproduction and growth traits using a linear animal mixed model. In addition, relationships among estimated breeding values (EBVs) these explored principal component analysis. The studied in age at first calving (AFC), second (ASC), interval (CI), bodyweight 420 days (BW420). heritability AFC, ASC, CI BW420 0.03±0.01, 0.07±0.01, 0.06±0.02, 0.24±0.02, respectively. correlations AFC with...
Nelore is the major beef cattle breed in Brazil with more than 130 million heads. Genome-wide association studies (GWAS) are often used to associate markers and genomic regions growth meat quality traits that can be assist selection programs. An alternative methodology traditional GWAS involves construction of gene network interactions, derived from results several AWM (Association Weight Matrices)/PCIT (Partial Correlation Information Theory). With aim evaluating genetic architecture...
In beef cattle, growth, reproductive, and carcass traits have been studied for improving productivity quality of meat products. The aim this study was to estimate genetic parameters birth (BW), weaning (WW) yearling (YW) weights, scrotal circumferences at (SCW) (SCY), age first calving (AFC), ribeye area (REA) back fat thickness (BFT) in order provide support the evaluation program composite Canchim breed. Data on 12 967 7481 (WW), 5131 (YW), 1447 (SCW), 1224 1400 2082 (REA BFT) animals were...
Beef cattle breeding programs in Brazil have placed greater emphasis on the genomic study of reproductive traits males and females due to their economic importance. In this study, genome-wide associations were assessed for scrotal circumference at 210 d age, 420 age first calving, second Canchim beef cattle. Data quality control was conducted resulting 672,778 SNPs 392 animals.Associated observed (435 SNPs), followed by (12 calving (six (four SNPs). We investigated whether significant within...
Summary Candidate gene strategy has been proposed to direct the search for quantitative trait loci, and polymorphisms at these loci have associated with several production traits in bovine. A total of 211 animals resulting from crosses between Nelore females sires either Aberdeen Angus, Canchim Simmental breeds were analyzed restriction fragment length (RFLPs) κ ‐casein, β ‐lactoglobulin (LGB) growth hormone GH genes. Average daily gain birth weaning (GBW) yearling (GWY) by a statistical...
The ASAP1 gene is located in a QTL region for meat production traits and to access the role of gene, association between SNP this beef cattle was studied. For this, about 270 steers reference families Nelore breed were used. investigation marker effects on performed using mixed model under restricted maximum likelihood method. Novel shear force measured at 24 h post mortem (P≤0.0083) described population cattle. This polymorphism accounted 1.13% total additive variance 17.51% phenotypic...
Meat quality involves many traits, such as marbling, tenderness, juiciness, and backfat thickness, all of which require attention from livestock producers. Backfat thickness improvement by means traditional selection techniques in Canchim beef cattle has been challenging due to its low heritability, it is measured late an animal's life. Therefore, the implementation new methodologies for identification single nucleotide polymorphisms (SNPs) linked are important strategy genetic carcass meat...
Beef cattle require dietary minerals for optimal health, production and reproduction. Concentrations of in tissues are at least partly genetically determined. Mapping genomic regions that affect the mineral content bovine longissimus dorsi muscle can contribute to identification genes control balance, transportation, absorption excretion could be associated metabolic disorders. We applied a genome-wide association strategy genotyped 373 Nelore steers from 34 half-sib families with Illumina...
Recent technological advances in genomics have allowed the genotyping of cattle through single nucleotide polymorphism (SNP) panels. High-density SNP panels possess greater genome coverage and are useful for identification conserved regions due to selection, known as selection signatures (SS). The SS detectable by different methods, such extended haplotype homozygosity (EHH); integrated score (iHS), which is derived from EHH. aim this study was identify Canchim (composite breed), genotyped...
Os dados são relativos aos pesos de animais da raça Tabapuã, nascidos no período 1959 a 1996 em várias regiões brasileiras. As observações foram analisadas com o objetivo avaliar as mudanças genéticas aditivas diretas e maternas dos padronizados para 205 (P205), 365 (P365) 550 (P550) dias idade. estimativas componentes (co) variância utilizadas cálculo valores genéticos obtidas pelo método máxima verossimilhança restrita livre derivadas (REML), usando aplicativo MTDFREML, cujo modelo...
Resistance of beef cattle heifers to the tick Boophilus microplus was evaluated by artificial infestation 66 following genetic groups: 16 Nelore (NE), 18 Canchim x (CN), Angus (AN) and Simmental (SN). The animals, with a mean age 16.5 months, were maintained no chemical control in Brachiaria decumbens pasture. Four infestations 20,000 B. larvae carried out 14 days apart from day 22 each number engorged female ticks (> 4.5 mm) counted on left side heifer. Data analyzed as percentage return...
Summary A population of 1398 Canchim (CA) cattle was genotyped to assess the association an insulin‐like growth factor 1 ( IGF1 ) gene microsatellite with phenotypic variation and estimated breeding values pre‐weaning, weaning post‐weaning traits. After initial analysis, genotype only had a significant effect P < 0.05) on birth weight (BW) adjusted 240 days (WW240). For these two traits, direct maternal were using restricted maximum likelihood reml ). Two analyses carried out. In first...
Resistance to natural infection by gastrointestinal nematodes was compared in 67 female calves of the following genetic groups: Nelore (NX); 1/2 Senepol+1/2 (SN); and Aberdeen Angus+1/2 (AN). The NX (n=26), SN (n=23) AN (n=18) animals were monitored for 14 months, during which they remained without treatment, allowed graze a tropical environment. Eggs per gram feces (EPG), coprocultures packed cell volume (PCV) carried out monthly. No significant effects interaction between groups month/year...
Os objetivos neste trabalho foram avaliar as relações entre os escores visuais de estrutura corporal, precocidade e musculosidade ao sobreano (aproximadamente 550 dias idade) com características crescimento para verificar possibilidades utilizar essas como critérios seleção. Foram obtidas estimativas dos componentes covariâncias por máxima verossimilhança restrita empregando-se um modelo animal o efeito fixo grupo contemporâneo a idade covariável (efeitos linear quadrático). grupos...