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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
04/05/1999 |
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Data da última atualização: |
04/05/1999 |
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Autoria: |
LEWONTIN, R. C.; HUBBY, J. L. |
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Afiliação: |
Department of Zoology, University of Chicago (Chicago, Illinois). |
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Título: |
A molecular approach to the study of genic heterozygosity in natural populations. II. Amount of variation and degree of heterozygosity in natural populations of Drosophila pseudoobscura. |
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Ano de publicação: |
1966 |
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Fonte/Imprenta: |
Genetics, v.54, p.595-609, 1966. |
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Idioma: |
Inglês |
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Conteúdo: |
As pointed out in the first paper of this series (Hubby and Lewontin 1966), no one knows at the present time the kinds and frequencies of variant alleles present in natural populations of any organism, with the exception of certain special classes of genes. For human populations we know a good deal about certain polymorphisms for blood cell antifens, serum proteins, and metabolic disorders of various kinds but we can hardly regard theses, a priori, as typical of the genome as a whole. Clearly we need a method that will randomly sample the genome and detect a major proportion of the individual allelic substitutions that are segregating in a population. In our previous paper, we discussed a method for accomplishing this end by means of a study of electrophoretic variants at a large number of loci and we showed that the variation picked up by this method behaves in a simple Mendelin fashion so that phenotypes can be equated to hemozygous and heterozygous genotypes at single loci. |
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Palavras-Chave: |
Estudo genetico; Mosca-da-fruta; Natural population; Populacao natural; Populations; Study of genic. |
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Thesagro: |
Genética; População. |
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Thesaurus Nal: |
Drosophila pseudoobscura; genetics. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01775naa a2200253 a 4500
001 1795574
005 1999-05-04
008 1966 bl --- 0-- u #d
100 1 $aLEWONTIN, R. C.
245 $aA molecular approach to the study of genic heterozygosity in natural populations. II. Amount of variation and degree of heterozygosity in natural populations of Drosophila pseudoobscura.
260 $c1966
520 $aAs pointed out in the first paper of this series (Hubby and Lewontin 1966), no one knows at the present time the kinds and frequencies of variant alleles present in natural populations of any organism, with the exception of certain special classes of genes. For human populations we know a good deal about certain polymorphisms for blood cell antifens, serum proteins, and metabolic disorders of various kinds but we can hardly regard theses, a priori, as typical of the genome as a whole. Clearly we need a method that will randomly sample the genome and detect a major proportion of the individual allelic substitutions that are segregating in a population. In our previous paper, we discussed a method for accomplishing this end by means of a study of electrophoretic variants at a large number of loci and we showed that the variation picked up by this method behaves in a simple Mendelin fashion so that phenotypes can be equated to hemozygous and heterozygous genotypes at single loci.
650 $aDrosophila pseudoobscura
650 $agenetics
650 $aGenética
650 $aPopulação
653 $aEstudo genetico
653 $aMosca-da-fruta
653 $aNatural population
653 $aPopulacao natural
653 $aPopulations
653 $aStudy of genic
700 1 $aHUBBY, J. L.
773 $tGenetics$gv.54, p.595-609, 1966.
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
10/02/2020 |
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Data da última atualização: |
28/04/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
FERREIRA, T. A.; MARTINSA, P. G. M. A.; GOUVEIA, G. C.; ABREU, L. R. A.; GOUVEIA, A. M. G.; FACO, O.; COLOSIMO, E. A.; FURUSHO-GARCIA, I. F.; PEREIRA, I. G. |
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Afiliação: |
TALITA A. FERREIRA, Federal University of Jequitinhonha and Mucuri Valleys (UFVJM) - Diamantina, MG, Brazil; Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil; PAULO G.M.A. MARTINSA, Federal University of Jequitinhonha and Mucuri Valleys (UFVJM) - Diamantina, MG, Brazil; GABRIELA C. GOUVEIA, Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil; LUÍZA R.A. ABREU, Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil; AURORA M.G. GOUVEIA, Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil; OLIVARDO FACO, CNPC; ENRICO A. COLOSIMO, Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil; IRAIDES F. FURUSHO-GARCIA, Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil; IDALMO G. PEREIRA, Federal University of Minas Gerais (UFMG) - Belo Horizonte, MG, Brazil. |
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Título: |
Proportional hazard models associated with the survival of dairy goats reared in a tropical environment. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Small Ruminant Research, v. 184, Mar. 2020. |
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DOI: |
https://doi.org/10.1016/j.smallrumres.2020.106063 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Increasing the functional life of a doe in order to keep the most productive females in the herd as long as possible can result in a reduction of replacement costs because of the better utilization of the animal in the production system. Thus, the objective was to evaluate the influence of environment effect, and morphometric and type traits on the culling that limits the stay of a doe of an exotic dairy goat breed reared in a tropical climate in the herd (stayability). The data utilized in the present study had information of 1439 Saanen does, born between 2000 and 2015, from 17 herds. The stay in the herd for longer than 28 months of age (STAY28), that is lack of culling, was defined as successful; the does? records were then not censored (C?=?1). On the other hand, does kept in the herd for less than 28 months had their records censored (C?=?0), once we considered that she still would kid. Does sold to other farmers were considered censored. Information regarding birth year, birth season, herd, six morphometric traits, and 12 visual appraisal-scored traits were evaluated. The Cox proportional hazard rate and the Kaplan-Meier models were fitted to analyze the data. Birth year, body length, rump width, feet and legs soundness, udder, and teat conformation were the traits that affected STAY28. For each birth year, body length, and rump width, reductions of 4 %, 2 %, and 5 % were observed on the culling hazard of a doe, respectively. Does with great scores for traits related to the mammary system were prematurely culled from the herd. In conclusion, STAY28 can be used as a selection criterion based on the aforementioned morphological and type traits, since it is effective to early detect individuals that will stay longer and more productive in a herd. Therefore, these traits should be considered in breeding programs. MenosAbstract: Increasing the functional life of a doe in order to keep the most productive females in the herd as long as possible can result in a reduction of replacement costs because of the better utilization of the animal in the production system. Thus, the objective was to evaluate the influence of environment effect, and morphometric and type traits on the culling that limits the stay of a doe of an exotic dairy goat breed reared in a tropical climate in the herd (stayability). The data utilized in the present study had information of 1439 Saanen does, born between 2000 and 2015, from 17 herds. The stay in the herd for longer than 28 months of age (STAY28), that is lack of culling, was defined as successful; the does? records were then not censored (C?=?1). On the other hand, does kept in the herd for less than 28 months had their records censored (C?=?0), once we considered that she still would kid. Does sold to other farmers were considered censored. Information regarding birth year, birth season, herd, six morphometric traits, and 12 visual appraisal-scored traits were evaluated. The Cox proportional hazard rate and the Kaplan-Meier models were fitted to analyze the data. Birth year, body length, rump width, feet and legs soundness, udder, and teat conformation were the traits that affected STAY28. For each birth year, body length, and rump width, reductions of 4 %, 2 %, and 5 % were observed on the culling hazard of a doe, respectively. Does with great scores for trait... Mostrar Tudo |
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Palavras-Chave: |
Caprino leiteiro; Conformação corporal; Conformation traits; Survival analysis. |
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Thesagro: |
Cabra Leiteira; Eficiência Reprodutiva; Longevidade; Melhoramento Genético Animal; Sobrevivência. |
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Thesaurus NAL: |
Brazil; Dairy goats; Longevity; Reproductive performance; Saanen; Survival rate. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 03074naa a2200409 a 4500
001 2120068
005 2020-04-28
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.smallrumres.2020.106063$2DOI
100 1 $aFERREIRA, T. A.
245 $aProportional hazard models associated with the survival of dairy goats reared in a tropical environment.$h[electronic resource]
260 $c2020
520 $aAbstract: Increasing the functional life of a doe in order to keep the most productive females in the herd as long as possible can result in a reduction of replacement costs because of the better utilization of the animal in the production system. Thus, the objective was to evaluate the influence of environment effect, and morphometric and type traits on the culling that limits the stay of a doe of an exotic dairy goat breed reared in a tropical climate in the herd (stayability). The data utilized in the present study had information of 1439 Saanen does, born between 2000 and 2015, from 17 herds. The stay in the herd for longer than 28 months of age (STAY28), that is lack of culling, was defined as successful; the does? records were then not censored (C?=?1). On the other hand, does kept in the herd for less than 28 months had their records censored (C?=?0), once we considered that she still would kid. Does sold to other farmers were considered censored. Information regarding birth year, birth season, herd, six morphometric traits, and 12 visual appraisal-scored traits were evaluated. The Cox proportional hazard rate and the Kaplan-Meier models were fitted to analyze the data. Birth year, body length, rump width, feet and legs soundness, udder, and teat conformation were the traits that affected STAY28. For each birth year, body length, and rump width, reductions of 4 %, 2 %, and 5 % were observed on the culling hazard of a doe, respectively. Does with great scores for traits related to the mammary system were prematurely culled from the herd. In conclusion, STAY28 can be used as a selection criterion based on the aforementioned morphological and type traits, since it is effective to early detect individuals that will stay longer and more productive in a herd. Therefore, these traits should be considered in breeding programs.
650 $aBrazil
650 $aDairy goats
650 $aLongevity
650 $aReproductive performance
650 $aSaanen
650 $aSurvival rate
650 $aCabra Leiteira
650 $aEficiência Reprodutiva
650 $aLongevidade
650 $aMelhoramento Genético Animal
650 $aSobrevivência
653 $aCaprino leiteiro
653 $aConformação corporal
653 $aConformation traits
653 $aSurvival analysis
700 1 $aMARTINSA, P. G. M. A.
700 1 $aGOUVEIA, G. C.
700 1 $aABREU, L. R. A.
700 1 $aGOUVEIA, A. M. G.
700 1 $aFACO, O.
700 1 $aCOLOSIMO, E. A.
700 1 $aFURUSHO-GARCIA, I. F.
700 1 $aPEREIRA, I. G.
773 $tSmall Ruminant Research$gv. 184, Mar. 2020.
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