Jose Bergmann

• Federal University of Minas Gerais

The objectives were to conduct a genetic evaluation of residual feed intake (RFI) and residual feed intake adjusted for fat (RFIFat) and to analyse the effect of selection for these traits on growth, carcass and reproductive traits. Data from 945 Nellore bulls in seven feed efficiency tests in a feedlot were analysed. Genetic evaluation was perform...

Background Central testing is used to select young bulls which are likely to contribute to increased net income of the commercial beef cattle herd. We present genetic parameters for growth and reproductive traits on performance-tested young bulls and commercial animals that are raised on pasture and in feedlots. Methods Records on young bulls and...

The temperament of Guzerá females was evaluated to identify genetic and non­genetic factors influencing the expression of this trait, providing information to support decision­making in breeding programs. Temperament assessed by reactivity was evaluated in a livestock scale using visual scoring (TS) and an electronic device (TR). Measurements were...

This study was carried out to evaluate kinematics traits of young horses during free jumping regarding their success or not. One hundred and eight young Brazilian Sport Horses in five free jumpings attempts were record over a vertical obstacle of 0.60 m, 0.80 and 1.05 m height at 22-25 to 29-32 and 36-39 months of age, respectively. A total of 1.34...

Objetivou-se avaliar as características cinemáticas de potros nos saltos em liberdade, com sucesso ou insucesso. Foram avaliados 108 potros Brasileiro de Hipismo em cinco saltos, em liberdade, no obstáculo vertical com altura de 0,60 m aos 22-25 meses de idade; 0,80 m aos 29-32 meses de idade e 1,05 m aos 36-39 meses de idade. Foram filmados e aval...

RESUMO Dados de suínos das raças Landrace (LD) e Large White (LW) foram utilizados para estimar componentes de variância para número total de leitões nascidos (NTN), nascidos vivos (NV) e de leitões vivos ao quinto dia (LV5). Usou-se o método da máxima verossimilhança restrita (REML) para estimar componentes de variância. O modelo misto incluiu os...

Recently, horse breeding has achieved greater prominence in the Brazilian society and now it started to appear as a part of the Brazilian agribusiness. The state of Minas Gerais stands out as the main producer of equidae in Brazil. The aim of this work was to characterize the breeding of equidae in this State in order to support future researches i...

Este trabalho teve como objetivo avaliar o efeito do treinamento sobre as variáveis da cinemática de equinos jovens da raça Brasileiro de Hipismo no salto em liberdade. Foram utilizados 14 equinos da raça Brasileiro de Hipismo com idade de 40 a 42 meses, peso vivo de 436,3±11,6kg e 448,2±12,7kg e altura na cernelha de 1,57±0,03m e 1,58±0,03m ao iní...

The objective of this work was to determine the genetic parameters for weight from birth to 730 days of age in Indubrasil breed. Weight data set (82,481) of 20,890 animals from birth to 730 days of age were used. The genetic parameters were determined by random regression. A posteriori distributions of the parameters of interest were obtained by th...

The aims of this study were to estimate genetic parameters for scrotal circumference (SC) at 365 (SC365, n = 8,564), 455 (SC455, n = 7,463) and 550 (SC550, n = 4,447) days of age using different models and to verify the effect of adjustments for body weight and for weight gain (WG) on parameter estimates. Parameters were estimated using the REML me...

Introduction The study of kinematic patterns of young jumping horses can help to improve selection. This study was carried out to predict free jumping success of young horses using logistic regression to model jumping kinematic variables. Methods 108 untrained young B razilian S port H orses of both genders were studied. R eflective skin markers w...

Twenty-four young Nelore bulls were divided in group 1 (G1, at puberty) and group 2 (G2, after puberty), according to characteristics of seminal concentration and gradual motility of the spermatozoa. Zoothecnic, seminal and endocrine characteristics were evaluated at puberty and after puberty, at 12, 14, 16 and 18 months of age. The average of age,...

The objectives of the present study were to obtain posterior densities of genetic parameters for scrotal circumference (SC), testicular volume (TV), BW and age at puberty, determine their correlations, and to evaluate the inclusion of these traits as selection criteria for sexual precocity in Guzerat bulls. Two-trait analyses were performed includi...

The objective of this study was to estimate (co)variance components for weight at 550 days, average daily gain and an index with both traits, and to compare alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests. The heritability estimates were 0.73, 0.31 and 0.44 for weight at 550 days, average daily gain and i...

This research aimed to evaluate the morphology of Brasileiro de Hipismo foals using digital image analysis and girth measurements to estimate body indexes of animals. The linear and angular measurements were obtained by digital images of the foals with camera triggered by Simi Reality Motion Systems®. The measures were based on anatomical landmarks...

The objective was to use various nonlinear models to describe scrotal circumference (SC) growth in Guzerat bulls on three farms in the state of Minas Gerais, Brazil. The nonlinear models were: Brody, Logistic, Gompertz, Richards, Von Bertalanffy, and Tanaka, where parameter A is the estimated testis size at maturity, B is the integration constant,...

The objectives of this study were to characterize testicular development, assess the existing association between scrotal circumference (SC) and testicular volume (VOL), as well as to identify testicular parameters in puberty of males of the Guzerat breed. Three hundred thirty males were evaluated, totaling 1757 observations every three months, fro...

El presente estudio caracterizó el desarrollo testicular, evaluó la asociación existente entre el perímetro escrotal (PE) y el volumen testicular (VOL) e identificó los parámetros testiculares en la pubertad en machos de la raza guzerat. Se evaluaron 330 machos que totalizaron 1757 observaciones realizadas cada tres meses, desde el destete hasta lo...

The objective of this study was to evaluate the effects of genetic group and environmental factors, including farm of origin, season of calving and lactation number, on the individual lactation curves of 1,010 Holstein-Gyr, Guzerat-Holstein, Holstein-Nellore, and Holstein-Zebu F1 cows on the experimental farms of the Agricultural Research Company i...

Two methodologies in genetic evaluation of growth curves of Nellore cattle were compared: the SAEM algorithm and the Two Step method. To implement these methodologies the Brody modified growth curve and the sire model were used. The difference between the SAEM and the Two Step is that SAEM estimates jointly the parameters of the model and genetics...

The objective of this study was to study the animal reactivity and correlate it with performance and meat quality of cattle finished in feedlots. A total of 20 animals of the Tabapuã breed and 20 animals of the Nellore breed were confined for 112 days: 28 days of adaptation and 84 days of data collection. Performance was determined by the average d...

Twenty-four Nelore bulls (Bos taurus indicus) were divided in three groups of eight animals each according to EP: Group 1 - EP above average (EP>22.8cm); Group 2 - EP 5% below average (EP between 21.6 and 22.6cm); and Group 3 - EP from 10 to 5% below average (EP between 20.1 and 21.2cm). For the AOL and EG analysis the 24 animals were divided in tw...

This study aimed to evaluate cluster analysis in classifying and selecting non linear models to describe Nelore beef cattle growth based on different goodness of fit criteria tests. A total of 12 non linear models were evaluated based on the following criteria: the determination coefficient (R2), error mean square (QME), Akaike information criterio...

Lactation curves were fitted from 1,340 lactations of F1 Holstein-Gyr, Holstein-Guzerat, Holstein-Nellore and Holstein-Undefined Zebu crossbred cows from two farms with milk controls carried out every 14 days. Nutritional management was based on pastures in the summer, and corn silage and sugar cane with urea during winter and concentrated rations...

Nutritional management studies to improve the performance of Mangalarga Marchador (MM) horses during the marcha test are limited. This study was designed to test the hypothesis that chelated trivalent chromium (CR) feed supplementation may reduce the suitability of the length of the interval between concentrate feeding and the marcha test among MM...

The Guzerat breed is well adapted to the tropical conditions of Brazil. After 1940, the widespread use of Guzerat cattle for crossing has reduced its population size. In 1994, a selection program for milk production traits was initiated in some purebred herds. However, its success is compromised by genetic drift and an increased inbreeding coeffici...

One hundred and fifteen unrelated Mangalarga Marchador horses were sampled from three geographically distinct regions of Minas Gerais State, Brazil (South, Southeast, and Northeast) and tested for 10 microsatellite loci. Genetic diversity and population structure parameters were estimated with ARLEQUIN 3.0, CERVUS 2.0, POPGENE 1.31, GENEPOP on the...

The effects of State and stud of origin, management (on pasture or in stable), gender, and age on morphometrics traits (measurements of 12 bone segments, 11 joint angles, two perimeters, and two heights) of 169 Mangalarga Marchador horses (82% females) raised in 11 herds of Minas Gerais and five from São Paulo State, were evaluated using the least...

The effects of State and stud of origin, management (on pasture or in stable), gender, and age on morphometrics traits (measurements of 12 bone segments, 11 joint angles, two perimeters, and two heights) of 169 Mangalarga Marchador horses (82% females) raised in 11 herds of Minas Gerais and five from Sao Paulo State, were evaluated using the least...

Avaliou-se o efeito da covariância genética aditiva direto-materna sobre estimativas de parâmetros genéticos e sobre a predição e a ordenação de valores genéticos de animais da raça Tabapuã. Os parâmetros genéticos foram estimados com base em 19646, 14276, 10663 e 6172 registros de pesos ao nascimento e ajustados para 205, 365 e 550 dias de idade e...

Genetic parameters were estimated for body weight and real-time ultra-sound loin-eye area, rump fat thickness, and back fat thickness using data from 1,325 yearling Guzera cattle (90.4% bulls and 9.6% heifers) and pedigree structure with 6,642 animals. Variance and covariance components were estimated using REML methodology and MTDFREML software. S...

Avaliou-se a influência do DNA mitocondrial sobre características de produção e reprodução em rebanho Gir. Foram analisados, segundo a origem mitocondrial (indicus ou taurus) e linhagem citoplasmática (fêmeas fundadoras), 3385 registros de produção total de leite (PT), produção de leite até os 305 dias de lactação (P305) e de período de lactação (P...

This study was carried out to evaluate the mitochondrial DNA effect on production and reproduction traits of Gir breed. A total of 3,385 records of milk production (MP), 305-day milk production (305-MP), and lactation length (LL); and 2,394 records of calving interval (CI), milk production per day of calving interval (MPPDCI), and age at first calv...

Genetic parameters were estimated for body weight and real-time ultra-sound loin-eye area, rump fat thickness, and back fat thickness using data from 1,325 yearling Guzera cattle (90.4% bulls and 9.6% heifers) and pedigree structure with 6,642 animals. Variance and covariance components were estimated using REML methodology and MTDFREML software. S...

Body weight records from 90 to 450 days of age of Nellore animals from the Southeast and Center West of Brazil were used do estimate covariance structures of age dependent random effects for each region using random regression models. Covariance components of the regression coefficients were estimated by EMREML using the software REML90. The fixed...

Body weight records from 90 to 450 days of age of Nellore animals from the Southeast and Center West of Brazil were used do estimate covariance structures of age dependent random effects for each region using random regression models. Covariance components of the regression coefficients were estimated by EMREML using the software REML90. The fixed...

The new Microscopy Center at the Federal University of Minas Gerais (UFMG) is presently in the final stages of construction. Here, we will describe the history as well as the technical aspects of this new facility, which will be fully available to the scientific, state and private enterprise communities in 2007. We envision that this multi-user fac...

Dados de 769.925 animais da raça Nelore, nascidos de 1965 a 2000, em 30 regiões distintas do Brasil, foram utilizados como base de dados para desenvolvimento de um programa computacional flexível, de fácil uso, que permitisse a identificação de linhagens fundadoras de rebanhos, com filtro por país, estado, região ou rebanho. Foi escolhida a região...

Records on 769,925 Nelore animals born from 1965 to 2000, in 30 regions of Brazil were used as base data to develop a flexible a ease use computational program for identifying maternal base lines in herds, allowing filter by country, state, region and herd. The Center-West region was selected for a detailed study of cytoplasmatic lines on weaning a...

The variance and covariance components, heritability for direct and maternal effects, correlations between direct and maternal effects and permanent environmental component of variance were estimated, using the REML methodology for birth weight (BW), weaning weight adjusted for 205 days (W205), weights at 365 (W365) and at 550 (W550) days of age in...

Images of 10 horses and 13 mares of Mangalarga Marchador breed were taken and digitalized to analyze the joint angle-time curves. Reflexives and adhesives markers were glued on 19 articulations points of the hindlimbs and forelimbs of the horses. The images were taken at 250 frames per second and the digitalization and analysis were made using a Si...

Images of 10 horses and 13 mares of Mangalarga Marchador breed were taken and digitalized to analyze the joint angle-time curves. Reflexives and adhesives markers were glued on 19 articulations points of the hindlimbs and forelimbs of the horses. The images were taken at 250 frames per second and the digitalization and analysis were made using a Si...

Factors affecting pregnancy rate of 5627 Zebu embryos in crossbred females with unknown proportions of Holstein and Zebu breeding were examined. After evaluation for developmental stage, quality, and viability, embryos were immediately transferred to recipients. Pregnancy diagnosis was conducted approximately 53 d after transfer; pregnancy rate was...

Utilizou-se o método dos quadrados mínimos para avaliar os efeitos da composição genética (CG) e dos fatores de meio sobre a produção total de leite (PL), duração da lactação (DL) e produção de leite por dia de intervalo de partos (P/I) (n=2.016) de 822 vacas mestiças (1/2, 3/4 e 7/8) Holandês-Gir, criadas no oeste de Minas Gerais. O efeito da capa...

Descreve-se uma nova metodologia para medir o temperamento dos bovinos por meio da reatividade, obtida por um dispositivo eletrônico que quantifica o número e a intensidade dos movimentos do animal em ambiente de contenção móvel, numa escala de 1 a 9.999 pontos. A reatividade foi comparada a características determinadas por outros dois métodos trad...

The effects of genetic composition (GC) and environmental factors on milk production (MP), lactation length (LL) and milk yield per day of calving intervals (P/I) (n=2,016) of 822 crossbred (1/2, 3/4 and 7/8) Holstein-Gyr cows, raised in the West of Minas Gerais State, Brazil, were evaluated using least squares methodology. The effect of predicted...

Data on 1,294 superovulations of Brahman, Gyr, Guzerat and Nellore females were used to evaluate the effects of: breed; herd; year of birth; inbreeding coefficient and age at superovulation of the donor; month, season and year of superovulation; hormone source and dose; and the number of previous treatments on the superovulation results. Four data...

Foram estudadas 1251 informações referentes aos pesos às idades-padrão de 205 (P205), 365 (P365) e 550 (P550) dias e idade ao primeiro parto (IPP) e primeiro intervalo de partos (IEP1) de fêmeas bovinas da raça Tabapuã. As médias, desvios-padrão e coeficientes de variação foram respectivamente: P205 – 173,9kg, 16,0kg e 9,2%; P365 – 225,7kg, 28,7kg...

Records on weaning, yearling and 550-day weights, age at first calving and first calving interval from 1251 Tabapuã females, born between 1987 and 1999, were used to estimate variance components and genetic parameters. Statistical analyses were performed and components of (co)variance and genetic parameters were estimated by the derivative-free alg...

Estimaram-se os parâmetros genéticos do peso à desmama ajustado para 240 dias de idade (PD240), da idade ao primeiro parto (IPP), da idade ao segundo parto (ISP) e do primeiro intervalo de partos (PIEP) em animais da raça Nelore, pelo método da máxima verossimilhança restrita, utilizando-se o aplicativo MTDFREML, sob modelo animal. As estimativas d...

Estimates of genetic parameters for weaning weight adjusted to 240 days of age (WW240), age at first calving (AFC), age at second calving (ASC) and first calving interval (FCI) in Nellore cattle using REML methodology (MTDFREML), were obtained. Heritability estimates from univariate analyses were: 0.48±0.20; 0.27±0.15; 0.14±0.16; and 0.03±0.13, for...

Pedigree information on 233,214 animal from the studbook of the Associacao Brasileira dos Criadores do Cavalo Mangalarga Marchador, related to 16 ancestors with, at least, 1% of genetic contribution to the actual population were used to describe the genetic structure of breed population. Principal component analyses were used to classify animals of...

A partir de informações de 286.047 animais registrados na Associação Brasileira dos Criadores do Cavalo Mangalarga Marchador, desde a sua fundação, em 1949, até dezembro de 1999, verificaram-se o coeficiente de endogamia e o tamanho efetivo da raça Mangalarga Marchador. A média do coeficiente de endogamia para toda a população foi de 1,3% e diferen...

Data on 286,047 Mangalarga Marchador horses from the studbook of the Associação Brasileira dos Criadores do Cavalo Mangalarga Marchador, born between 1949 and 1999 were used to describe the population genetic structure of the breed. Average inbreeding coefficient was 1.3% for all population and 22.6% of all animals were inbred with average inbreedi...

Variability in superovulatory response is a limiting factor for animal breeding programs using Multiple Ovulation and Embryo Transfer (MOET) nucleus schemes. To evaluate genetic factors affecting superovulory response, 1036 multiple ovulation records from 475 Brazilian Nellore embryo donors (daughters of 139 sires), 2.2-20.5-year olds, were analyze...

Data from the Brazilian Mangalarga Marchador Breed Association, including information on 292,012 animals borned from 1949 to 2000 were used to describe population structure. Frequency tables, central tendency and variation measurements according to owner, breeder, type of registration (known and unknown pedigree), year and month of births, progeny...

Data from the Brazilian Mangalarga Marchador Breed Association, including information on 292,012 animals borned from 1949 to 2000 were used to describe population structure. Frequency tables, central tendency and variation measurements according to owner, breeder, type of registration (known and unknown pedigree), year and month of births, progeny...

Efeitos de estádio da lactação, idade à classificação e grupo contemporâneo de rebanho, ano e estação de classificação foram considerados nas análises de 21 características lineares de tipo e pontuação final de 2.122 animais da raça Holandesa, filhos de 178 reprodutores e nascidos em 83 rebanhos. Utilizou-se o método dos quadrados mínimos nas análi...

Correlações genéticas e fenotípicas entre 21 características lineares de tipo e produção de leite em até 305 dias de lactação foram estimadas pela máxima verossimilhança restrita sob modelo animal, a partir de dados da Associação de Criadores de Gado Holandês de Minas Gerais. Nas análises das características lineares, os efeitos fixos utilizados no...

Stage of lactation, classification age and herd-year-season contemporary group effects were considered in the analyses of 21 linear type traits, in addition to final score using 2,122 Brazilian Holstein cows, from 83 herds and daughters of 178 sires. Least square methodology was applied in the analyses of variance. With the exception of fore udder...

Genetic and phenotypic correlations between 21 linear type traits and 305-day milk production were estimated by restrict maximum likelihood methodology, in a multiple-trait animal model, using data from Associação de Criadores de Gado Holandês de Minas Gerais. The highest genetic correlations between milk production and rear udder width (.60), and...

Genetic, environmental and phenotypic correlations between libido, testicular measurements, body weight and semen traits were estimated by multiple-trait-restricted maximum likelihood (MTDFREML) under animal models. Reproductive records, collected from 1992 to 1997, of 288 Nellore bulls were used. Estimates of heritability for libido unadjusted, ad...

Data on 71,991 animals of the Campolina horse breed studbook recorded from 1951 to 2000 were used to describe the population structure of the breed. Most of the animals (86.6%) originated from the Southeast States of Brazil. The average number of births per year was 1,159, and the maximum number of births (5,107) was observed in 1991. From the tota...

A partir das informações de 71.991 eqüinos da raça Campolina, registrados de 1951 até 2000 pela Associação Brasileira dos Criadores do Cavalo Campolina, observou-se que 86,6% dos animais pertenciam à região Sudeste. A média anual do número de nascimentos de 1951 a 1998 foi de 1.159 animais, sendo 5.107 o ápice em 1991. Dos 3.361 criadores e dos 4.8...

Data from 273 Nellore bulls borned from 1992 to 1998 and with average age of 31 month were used to estimate by restricted maximum likelihood procedure the heritability for scrotal circumference (SC), libido (LIB), sperm motility (MOT), vigor (VIG), concentration (CON) and porcentage of defects (PD) and the genetic correlations between these traits....

Dados de 273 touros Nelore nascidos de 1992 a 1998 e com idade média de 31 meses foram utilizados para estimar as herdabilidades do perímetro escrotal (PE), libido (Lib), motilidade (mot), vigor (vig), concentração (con) e taxa de anormalidade seminal (ta) e as correlações genéticas entre essas características. Com o uso do método da máxima verosim...

Este estudo teve por objetivo medir o efeito da interação genótipo-ambiente (IGA) em algumas características de crescimento em bovinos Nelore. Os dados foram coletados em duas fazendas, em regiões distintas do Estado de Minas Gerais, Sul (faz I) e Noroeste (faz II), e correspondem aos pesos de 2.896 animais à pré-desmama (PD), 2.605 à desmama (DM)...

The objectives of this experiment were to quantify the relationships among variables observed before the breeding season and fertility of 321 Nelore heifers and to use these variables to fit prediction equations for heifers fertility, using logistic regression methodology. Variables analysed were: birth weight, weaning weight, yearling weight and b...

Data from 2073 Brasileira pony horses, born from 1974 to 1994, were used to predict breeding values and to study genetic trends of 10 linear traits. Derivative free restricted maximum likelihood methodology and MTDFREML algorithm were used for breeding value predictions. Genetic trend was accessed using weighted least squares estimates for regressi...

Os objetivos deste trabalho foram quantificar o relacionamento entre variáveis observadas antes da estação de monta e a fertilidade de 321 novilhas e usar tais variáveis no desenvolvimento de equações para predizer a fertilidade das novilhas usando-se metodologia de regressão logística. As variáveis foram: pesos ao nascer, à desmama e a um ano de i...

Dez medidas lineares de 2073 pôneis da raça Brasileira, nascidos de 1974 a 1994, foram utilizadas para obter méritos genéticos e avaliar tendências genéticas no período. Méritos genéticos foram preditos utilizando a metodologia da máxima verossimilhança restrita livre de derivadas, com o aplicativo MTDFREML. Tendências genéticas foram avaliadas pel...

The objective of this study was to measure the genotype-environment interaction (GEI) effect on some growth traits in Nellore cattle. Data from 2,896 records of pre-weaning (PW), 2,605 of weaning (WW) and 1,522 of post-yearling (YW) weights with a total of 9,911 pedigree animals from two farms of different regions of Minas Gerais State, South (farm...

Data from Brasileiro de Hipismo Stud Book, collected by the breed Association (ABCCH), from July 1977 to September 1998 were analyzed. Final data set included 19,303 animals, 11,508 Brasileiro de Hipismo (BH) and 7,795 of other foundation breeds. Data were analyzed for frequency, central tendency and range of variation according to owner, breeder,...

Records of birth, 100-day, weaning, yearling and 550-day weights of 7,587 calves born from 1977 to 1997, and 25,812 pedigree data were used to estimate variance components and genetic parameters of Simmental cattle raised on farms in Brazil, with MTDFREML procedure under animal model. The estimates of total, direct and maternal heritabilities, gene...

Registros de pesos ao nascimento, aos 100, 205, 365 e 550 dias de idade, de 7587 animais controlados pela Associação Brasileira de Criadores da Raça Simental, criados em 150 fazendas e em diversos estados do Brasil, foram usados para estimar os componentes de variância e os parâmetros genéticos dessas características. O peso padronizado aos 205 dia...

Data of 109.200 lactations were used to verify the effects of heterogeneity of variance on genetic evaluation of cows and bulls of Holstein breed raised in Brazil. Total milk production adjusted foradult age was used to classify the herds among three classes of phenotypic standard deviation: Low (<1427 kg), medium (between 1427 kg and 1625 kg) and...

The objectives of this work were to estimate of genetic parameters for scrotal circumference (SC) at 12 (SC12, n=652) and 18 (SC18, n=607) months of age, age at first calving (AFC, n=1,582), first (FCD, n=1,582) and second (SCD, n=644) calving dates and first calving interval (FCI, n=644) in Nellore cattle. Parameters were estimated using REML meth...

Utilizaram-se 15 touros selecionados entre 158, por meio de exame andrológico, qualidades físicas e morfológicas do sêmen e biometria testicular (teste 1) e de comportamento sexual (teste 2) que os classificaram de bons a excelentes. Organizaram-se dois grupos experimentais, G1 e G2, o primeiro composto por cinco touros e 400 vacas, estabelecendo,...

Foram obtidas estimativas de parâmetros genéticos para peso ao nascimento (PN) e ao sobreano (PSOB), ganhos de peso pré- (GPNDES) e pós-desmama (GP345), dias para 160 (D160) e 300kg (D300) de peso vivo, e taxas de crescimento relativo pré- (TCR1) e pós-desmama (TCR2), utilizando 60.470 animais Nelore. Adotou-se o método REML, sob modelo animal. Par...

From 158 sexually mature Nellore bulls evaluated for sexual soundness using physical and morphological characteristics of semen and scrotal circumference (test 1) and sexual behavior (test 2) 15 were classified either as good or excellent and they were selected. Bulls were randomly divided into two experimental groups: group 1-with five bulls for m...

Four functions to characterize scrotal circumference (SC) growth in Nellore bulls were compared to identify which was the most suitable for biological interpretation. Nellore bulls (n = 532), born between September and December of 1992 to 1994 were used in the study. Measurements were made on fixed dates in January, April, July and October of each...

The aims of the present study were to estimate genetic parameters, as well as phenotypic, genetic and environmental trends for age at first calving (AFC) and calving intervals (CI) on Gyr dairy breed, using a multivariate derivative-free restricted maximum likelihood (MTDFREML) with an animal model. The mathematic model for calving interval include...

Informações de genealogia e produção, cedidas pela Associação Brasileira de Criadores da Raça Simental (ABCRS), relativas aos pesos desde o nascimento até um ano de idade, foram utilizadas para estimar, sob modelos alternativos, os componentes de variância e os parâmetros genéticos em animais da raça Simental no Brasil. A matriz de parentesco inclu...

Informações de genealogia e produção, cedidas pela Associação Brasileira de Criadores da Raça Simental (ABCRS), relativas aos pesos desde o nascimento até um ano de idade, foram utilizadas para estimar, sob modelos alternativos, os componentes de variância e os parâmetros genéticos em animais da raça Simental no Brasil. A matriz de parentesco inclu...

O objetivo do estudo foi estimar os parâmetros e as tendências fenotípica, genética e ambiental para idade ao primeiro parto (IPP) e intervalo de partos (IDP) na raça Gir, com o emprego de análises uni e bivariadas sob o método da máxima verossimilhança restrita, por meio de algoritmo livre de derivadas (MTDFREML), que ajusta o modelo animal. O mod...

Dados de 36.755 primeiras lactações de vacas holandesas, filhas de 866 reprodutores, distribuídas em diferentes estados no período de 1980 a 1993, foram estratificados em rebanhos de acordo com o desvio-padrão fenotípico da produção de leite ajustada para idade adulta, em três níveis: baixo (11.713 lactações), médio (12.764 lactações) e alto (12.27...

The objectives of this work was to evaluate possible changes in the morphological measurements among genetic groups (GG) Indubrazil, Nellore and Tabapuan and among the GG of their daughters F1 Holstein x Indubrazil (HxI), Holstein x Nellore (HxN) e Holstein x Tabapuan (HxT), besides the heritability estimates coefficients (h2) for these traits. Lea...

To evaluate the effects of cytoplasm lineage (CL) the body weight (BW, n = 707) and greasy fleece weight (FW, n = 703) of females and fiber wool diameter (FD, n = 350 males) of males sheep from yearling Merino sheep were used. The pedigree information included 3,645 animals and an average of 10 generations. The Maximum Restricted Likelihood methodo...

The objective of this work was to estimate the (co) variance components and direct and maternal heritability of the body weights of sheep of Santa Inês breed. A total of 3,771 lambs weights records of the Santa Inês hair sheep breed, progenies of 114 sires, and 758 ewes were analyzed, obtained from experimental herds of EMBRAPA - SNPA from 1985 to...

DFREML methodology and animal models were used to estimate heritabilities and genetic correlations between reproduction traits (age at first calving and first calving interval) and milk yield limited to 305 days in the first and second lactation. Original data file had 118,894 records on milk yield and reproductive traits of Brazilian Holstein fema...

Data from 7,823 Brazilian pony horses were used to characterize the breed in relation to Riding Horse Proportion System. It was also evaluated the effects of genetics and environmental factors on these proportions. The region of origin, type of registration (known and unknown pedigree), and sex were important sources of variation of all proportion...

The objective of this study was to evaluate genetic differences in temperament, scored from 1 (very good) to 5 (very poor temperament) among IND, NEL and TAB females, as well as among their F 1 Holstein x Zebu daughters. In addition, heritability estimates (h 2) for the trait were obtained. Least square methodology was used to verify differences in...

Mixed model methodology under univariate and bivariate animal models was used to estimate genetic parameters of scrotal circumference (SC) unadjusted (h2U) and adjusted (h2A) for body weight, from field data on 875 Nellore males sired by 80 bulls. The models included random effect of animal, the fixed effects of age of dam, year of birth, and month...

Data from 7723 animals registered in the Brazilian Pony Horse Association, in the period of 1971 to 1966, were used to estimate the genetic and phenotypic parameters of 10 linear measures, using restricted maximum likelihood methodology under single and two traits animal models. Besides the random animal effects, the fixed effects considered in the...

The objective of this work was to evaluate the genetic and environmental effects on 10 linear measures of Brazilian ponies breed. Data from 7723 animals were used, registered in the Genalogical Registration book of the Brazilian Pony Horse Association, in the period of 1971 to 1996. For all analyzed traits (withers and croup heights, lengths of hea...