Genetic And Environmental Correlations
Mostrando 37-48 de 69 artigos, teses e dissertações.
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37. Estimativa e parâmetros genéticos para características de crescimento e perímetro escrotal na raça Pardo Suíço Corte / Estimation of genetic parameters for growth traits and scrotal circumference in Braunvieh cattle
The aim of this study was to investigate a database of the Braunvieh cattle in Brazil, to estimate genetic parameters for growth traits, preweaning and postweaning weight gains and scrotal circumference, as well as carcass traits in purebreed and crossbreed Braunvieh cattle. The growth traits analyzed were birth weight (PN), weight at 120 days (P120), 205 da
Publicado em: 2008
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38. Estimativas de funÃÃes de covariÃncia para caracterÃsticas de crescimento da raÃa tabapuà utilizando modelo de regressÃo aleatÃria / Estimates of service for covariÃncia characteristics of growth of race tabapuà using model regressÃo random
The study used 28,873 weight records taken along the life of 6.471 animals of the race TabapuÃ, finery birth to 660 days of age, belonging to the animal archives of the Brazilian Association of Zebu Breeders (ABCZ) to estimate the covariÃnce functions using the models of random regression. The genetic, addictive direct an permanent environmental effects we
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/02/2007
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39. Genetic analyses of days to calving and their relationships with other traits in a Canchim cattle herd
Heritabilities and genetic correlations in a Canchim beef cattle herd were estimated using data on the following traits: male scrotal circumference at twelve months (SC12); days to first calving (DFC) for heifers; days to calving (DC) for cows; male and female weight (W) at twelve months (W12); heifer weight at the start of the first breeding season (WFBS) a
Genetics and Molecular Biology. Publicado em: 2007
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40. Influence of genetic and environmental factors on production and reproduction traits in a nellore cattle herd in Goias state HERD IN GOIAS STATE / Estudo da influência de fatores genéticos e ambientais sobre as características produtivas e reprodutivas em um rebalho de bovinos da raça Nelore no Estado de Goiás
The objective of this study was evaluate genetic and non-genetic factors which influence production and reproduction traits in a Nelore herd in Goiás state. Direct and maternal heritabilites and direct and common environmental effects were evaluated for birth weight (PN), weaning weight corrected for 205 days (P205), age at first calving (IPP), calving inte
Publicado em: 2007
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41. Genetic variability and agronomic characterization of heat tolerant Lettuce Progenies. / Variabilidade genética e caracterização agronômica de progênies de alface tolerantes ao calor.
The objective of this work was to estimate the genetic variability and the correlations between agronomic characters in thirteen progenies F7 of lettuce, and in the genitors: Verdinha, Regina and Tinto, and in the cultivars Luisa and Baba de Verão. The experiment was conducted in Vitória de Santo Antão PE, in the period from September to December of 2005.
Publicado em: 2006
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42. Controle genÃtico da qualidade da vagem em cruzamento de feijÃo-vagem x feijÃo-comum / Genetic control of pod quality in a cross between snap beans x common bean
Information on genetic control of pod quality in snap beans Phaseolus vulgaris L. are acarce in the literature, but are nonetheless important for decision-making during a breeding programme. The objective of this work was to study the types of gene action involved in phenotypic expression of pod quality in a cross between snap beans x common bean. Two segreg
Publicado em: 2006
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43. Estimation of genetic parameters for test-day milk yield in Holstein cows using a random regression model
Test-day milk yield records of 11,023 first-parity Holstein cows were used to estimate genetic parameters for milk yield during different lactation periods. (Co)variance components were estimated using two random regression models, RRM1 and RRM2, and the restricted maximum likelihood method, compared by the likelihood ratio test. Additive genetic variances d
Genetics and Molecular Biology. Publicado em: 2005-03
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44. EFFECT OF THE INCLUSION OF THE DIRECT-MATERNAL COVARIANCE ON THE ESTIMATIVE OF GENETIC PARAMETERS AND ON THE PREDICTION OF THE GENETIC VALUES FOR WEIGHT GAIN FOR CATTLE / EFEITO DA INCLUSÃO DA COVARIÂNCIA GENÉTICA DIRETA-MATERNA, NA ANÁLISE PARA ESTIMAR PARÂMETROS GENÉTICOS E PREDIZER VALORES GENÉTICOS PARA GANHO DE PESO EM BOVINOS DE CORTE.
The present study has as objective to evaluate the effect of the inclusion in the model of analysis, the covariance between the additive genetic direct and maternal effects, on the estimation of genetic parameters for average daily gain from birth to weaning (GMDND) and from weaning to 550 days of age (GMDDS), and on the prediction of genetic values and rank
Publicado em: 2005
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45. Isozyme Allelic Frequencies Related to Selection and Gene-Flow Hypotheses
Significant correlations between allelic frequencies and environmental variables in a number of insect species have been demonstrated by multivariate techniques. Since many environmental variables show a strong relationship to geographic location and since gene flow between populations can also produce patterns of gene frequencies which are related to the ge
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46. Genetic Analysis of Size-Scaling Patterns in the Mouse Mandible
The relationship between multidimensional form of the adult mouse mandible and body size is examined from an ontogenetic perspective. The origin and ontogeny of phenotypic correlations are described in terms of genetic and environmental covariance patterns between adult skeletal morphology and growth in body weight. Different ontogenetic patterns are observe
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47. Isozyme Genotype-Environment Associations in Natural Populations of the Harvester Ant, POGONOMYRMEX BADIUS
Harvester ants (P. badius) were collected from 49 localities in the southeastern U.S. Amylase and naphthylamidase activities were assayed by gel electrophoresis, and the frequencies of alleles controlling electrophoretic variation were calculated. Soil samples were analyzed and plotted against allelic frequencies. Climatographic and genetic data were analyze
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48. Quantitative Genetics of DROSOPHILA MELANOGASTER. I. Sexual Dimorphism in Genetic Parameters for Wing Traits
Sexual dimorphism in genetic parameters is examined for wing dimensions of Drosophila melanogaster. Data are fit to a quantitative genetic model where phenotypic variance is a linear function of additive genetic autosomal variance (common to both sexes), additive genetic X-linked variances distinct for each sex, variance due to common rearing environment of