Temperament is fundamental to animal production due its direct influence on the animal-herdsman relationship. When compared calm animals, aggressive, anxious or fearful ones exhibit less weight gain, lower reproductive efficiency, decreased milk and higher herd maintenance costs, all of which contribute reduced profits. However, temperament a trait that complex difficult assess. Recently, new quantitative system, REATEST®, for assessing reactivity, phenotype temperament, was developed....

The Brazilian Guzerá population originated from a few founders introduced India. These animals adapted well to the harsh environments in Brazil, were selected for beef, milk, or dual-purpose (beef and milk), extensively used produce crossbred animals. Here, impact of these historical events with regard structure genetic diversity meta-population was evaluated. DNA samples 744 (one dairy, nine dual-purpose, five beef herds) genotyped 21 microsatellite loci. Ho, He, PIC, Fis, Fit, Fst...

The aim of this study was to estimate genetic parameters for 305-day cumulative milk yield and components, growth, reproductive traits in Guzerá cattle.The evaluated were first-lactation yields (kg) (MY305), fat (FY305), protein (PY305), lactose (LY305), total solids (SY305); age at first calving (AFC) days; adjusted scrotal perimeter (cm) the ages 365 (SP365) 450 (SP450) body weight 210 (W210), (W365), (W450) days. (co)variance components estimated using restricted maximum likelihood method...

The objective of this work was to compare random regression models for the estimation genetic parameters Guzerat milk production, using orthogonal Legendre polynomials. Records (20,524) test-day yield (TDMY) from 2,816 first-lactation cows were used. TDMY grouped into 10-monthly classes analyzed additive effect and environmental residual permanent effects (random effects), whereas contemporary group, calving age (linear quadratic effects) mean lactation curve analized as fixed effects....

Objetivando determinar a melhor idade para inclusão do farelo de girassol (FG) e o seu nível nas rações frangos corte, bem como, avaliar viabilidade econômica desta inclusão, 480 pintos corte com 3 dias idade, metade cada sexo, foram distribuídos em um delineamento inteiramente ao acaso. Os tratamentos experimentais consistiram uma combinação níveis FG (0, 4, 8 12%) idades fornecimento destas (I1= 3-21, I2= 22-35 I3= 36-42 dias), sendo: T1= 0% I1, I2 I3; T2= 4% T3= 8% T4= 12% T5= na I1 T6=...

Inbreeding has been associated with the impairment of reproductive performance in many cattle breeds. Although usage biotechnologies increasing bovine populations, not much attention given to impact inbreeding over cow's on artificial reproduction. The objective this study was estimate vitro embryo production a Guzerá breed population. coefficient (F), calculated as half co-ancestry individual's parents, used an inbreeding. coefficients donor, sire (used fertilization) and embryos were...

Four models for in vitro embryo production traits Guzerá cattle were compared: Gaussian (untransformed variable – LIN and transformed logarithmic scale LOG), Poisson (POI) zero-inflated (ZIP). Data consisted of 5716 ovum pick-up fertilization records performed 1205 cows from distinct regions Brazil. Analyzed count the number viable oocytes (NOV), grade I (NGI), degenerated (NDG), cleaved embryos (NCLV) produced (NEMB). Heritability varied 0.17 (LIN) to 0.25 NOV; 0.08 (LOG) 0.18 (ZIP) NGI;...

Abstract The present study evaluated the heat stress response pattern of dual‐purpose Guzerá cattle for test‐day (TD) milk yield records first lactation and estimated genetic parameters trends related to stress. A total 31,435 TD from 4,486 lactations cows, collected between 1986 2012, were analysed. Two random regression models considered days in (DIM) and/or temperature × humidity‐dependent (THI) covariate. Impacts −0.037, −0.019 −0.006 kg/day/THI initial intermediate stages observed when...

Abstract Individual variation in milk fatty acid (FA) composition has been partially attributed to stearoyl‐CoA desaturase 1 ( SCD1 ) gene polymorphisms taurine breeds, but much less is known for Zebu breeds. This study investigated the phenotypic FA composition, and influence of variants on this trait fat indices (DI) Gir cows. The functional impact was predicted using bioinformatics tools. Milk blood samples were collected from 312 cows distributed 10 herds five states Brazil. identified...

ABSTRACT: The aim of this study was to explore the pattern genetic lactation curves Guzerá cattle using cluster analysis. Test-day milk yields 5,274 first-lactation cows were recorded in a progeny test. A total 34,193 monthly records analyzed with random regression animal model Legendre polynomials fit additive and permanent environmental effects mean trends. Hierarchical non-hierarchical analyses performed based on EBVs for test-day yield, peak persistency, partial cumulative 305-day...

O interesse ao reproduzir em cativeiro animais selvagens com potencial comercial, como a perdiz (Rhynchotus rufescens), pode ser uma alternativa viavel preservacao desta especie nativa. Assim sendo, conhecer eficiencia reprodutiva desses cativeiro, torna-se imprescindivel. presente trabalho teve por objetivo analisar os dados de dois ciclos postura 51 familias perdizes, compostas duas femeas e um macho, durante o periodo setembro 1999 marco 2001. peso medio das machos, quando eles iniciaram...

The Guzerá breed evolved from the introduction of breeds India, mainly Kankrej breed, into Brazilian livestock at end 19th century. adapted well to climatic conditions Brazil, where it is considered a dual-purpose and has been used for pasture-based beef, milk or production systems with use low-medium inputs. importance this genetic resource in tropical regions moved breeders implement National Breeding Program Improvement 1994, based on both progeny testing MOET nucleus schemes. We sought...

The Red Sindhi cattle breed was imported to Brazil in small numbers.Nowadays, the herds of this are distributed Northeast, Southeast and Midwest regions country.In study, DNA samples animals originating from 15 Northeast have been analyzed obtain ancestry proportions, gain a better understanding current population structure Brazil.Samples were genotyped using three different single nucleotide polymorphism (SNP) marker panels.Those markers used with approach unsupervised hierarchical...

The objective of this study was to estimate genetic parameters for test-day milk yield (TDMY) in Guzerá cows using random regression models. Additive and permanent environmental effects were modeled by on fourth- fifth-order orthogonal Legendre polynomials, respectively. residual variances heterogeneous, with seven classes. Heritability estimates TDMY ranged from 0.24 0.52, higher heritabilities yields during early lactation. Genetic correlations between TDMYs -0.03 0.95. phenotypic all...

Abstract This study aimed to investigate the feasibility of genomic prediction for productive and reproductive traits in Guzerá cattle using single-step BLUP (ssGBLUP). Evaluations included 305-day cumulative yields (first lactation, kg) milk, lactose, protein, fat, total solids; adjusted body weight (kg) at ages 450 days, 365 210 days; age first calving (in days), from a database containing 197,283 measurements males females born between 1954 2018. The pedigree 433,823 animals spanning up...