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| Registros recuperados: 22 | |
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| FARIA, C. U. de; KOURY FILHO, W.; MAGNABOSCO, C. de U.; ALBUQUERQUE, L. G. de; BEZERRA, L. A. F.; LÔBO, R. B.. |
| The aim of this study was to estimate the components of variance and genetic parameters for the visual scores which constitute the Morphological Evaluation System (MES), such as body structure (S), precocity (P) and musculature (M) in Nellore beef-cattle at the weaning and yearling stages, by using threshold Bayesian models. The information used for this was gleaned from visual scores of 5,407 animals evaluated at the weaning and 2,649 at the yearling stages. The genetic parameters for visual score traits were estimated through two-trait analysis, using the threshold animal model, with Bayesian statistics methodology and MTGSAM (Multiple Trait Gibbs Sampler for Animal Models) threshold software. Heritability estimates for S, P and M were 0.68, 0.65 and... |
| Tipo: Separatas |
Palavras-chave: Características morfológicas; Nelore cattle; Genetic parameter; Morphological characteristics.; Gado Nelore; Genética Animal; Parâmetro Genético.; Animal genetics.. |
| Ano: 2009 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/578888 |
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| Vettorazzi,Julio Cesar Fiorio; Santa-Catarina,Renato; Poltronieri,Tathianne Pastana de Sousa; Cortes,Diego Fernando Marmolejo; Azevedo,Alinne Oliveira Nunes; Miranda,Daniel Pereira; Santana,Josefa Grasiela Silva; Ramos,Helaine Christine Cancela; Pereira,Messias Gonzaga. |
| ABSTRACT: The growing demand for quality of papaya by the domestic and international markets requires the development of genotypes that are capable of incorporating traits, such as high yield and fruit quality. This study estimated the genetic parameters and the specific combining ability of F4 papaya lines crossed to the SS-72/12 tester to identify genotypes with higher genetic value for hybrid production. We evaluated 169 treatments consisting of 62 topcross hybrid combinations, 97 F5 lines, and 10 controls in a 13 × 13 lattice design with five replicates and two plants per plot. The following traits were evaluated: plant height (PH), stem diameter (SD), first-fruit insertion height (FFIH), number of marketable fruits (NMF), number of deformed fruits... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya L.; Papaya breeding; Topcross; Genetic parameter. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000201102 |
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| Sousa,José Ernandes Rufino de; Silva,Martinho de Almeida e; Sarmento,José Lindenberg Rocha; Sousa,Wandrick Hauss de; Souza,Maria do Socorro Medeiros de; Ferreira,Isabel Cristina. |
| It was used 4,313 weight records from birth to 196 days of age from 946 Anglo-nubiana breed goats, progenies from 43 sires and 279 dams, controlled in the period from 1980 to 2005, with the objective of estimating covariance functions and genetic parameters of animals by using random regression models. It was evaluated 12 random regression models, with degrees ranging from 1 to 7 for direct additive genetic and maternal and animal permanent environment effect and residual variance adjusted by using animal age ordinary polynomial of third order. Models were compared by using likelihood ratio test and by Bayesian information criterion of Schwarz and Akaike information criterion. The model selected based on Bayesian information criterion was the one that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Covariance function; Genetic parameter; Goat; Legendre polynomial. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100015 |
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| SOUZA, J. C.; SILVA, L. O. C. da; RAMOS, K. E. F. A. de; ALENCAR, M. M. de; GADINI, C. H.; VELAZSCO GUTIERREZ, R. R.; VLECK, L. D. van. |
| Records on 105 465 Nellore calves born from 1977 to 1994 in eight regions of Brazil were studied to evaluate the effects fo genotype x environment interaction on weaning weight calves. Teh interactions were estimated by the genetic correlation of weaning weight in defferent regions. To eastimate the variance and covariance components to obtain the genetic correlation of weaning weight under different regions, a sire model and MTDFREML solftware wereused for two regions each time. The matematical model included the fixed effects of year(17) and month(12),sex(2) of calf, farm(419) and age of dam (covarable), and the random effect of sire(588) and dam (57 162). The sire components of variance for each of the regions where 20.33,28.08,17.72,29.80,34.36, 38.08,... |
| Tipo: Artigo de periódico |
Palavras-chave: Nelore; Peso ao destete; Genetic parameter; Gado de Corte; Parâmetro Genético; Nellore; Weaning weight. |
| Ano: 1997 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/44151 |
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| PEREZ, B. C.; PEIXOTO, M. G. C. D.; BRUNELI, F. A. T.; RAMOS, P. V. B.; BALIEIRO, J. C. C.. |
| Abstract: The objective of this study was to estimate variance components for oocyte and embryo production traits in Guzerá breed female donors, and investigate their associations with age at first calving (AFC). The traits analyzed were the number of viable oocytes (NOV), the number of grade I oocytes (NGI), the number of cleaved embryos (NCLV), and viable embryos produced (NEMB), and the percentages of viable oocytes (POV), grade I oocytes (PGI), cleaved embryos (PCLV), and viable embryos (PEMB). Data were obtained from 5173 ovary puncture and in vitro fertilization (IVF) sessions using 1080 Guzerá female donors of different ages, occurred from March 2005 to July 2013. Variables were log-transformed (logeX+1) prior to analysis. (Co)variance components... |
| Tipo: Separatas |
Palavras-chave: Bivariate analysis; Genetic parameter; Ovum pick-up; Permanent environment; Zebu cattle.; In vitro fertilization.. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1061463 |
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| 村澤, 七月; 中橋, 良信; 浜崎, 陽子; 堀, 武司; 加藤, 貴之; 口田, 圭吾; KUCHIDA, Keigo. |
| 黒毛和種ロース芯内脂肪交雑の配置バランスと，ロース芯内各領域の脂肪交雑や色調に関する画像解析形質の遺伝的パラメータを推定し，またその遺伝的趨勢を調査することを目的とした．北海道内の枝肉市場に上場された黒毛和種4,598頭（去勢3,485頭，雌1,113頭）を分析に用いた．ロース芯画像を慣性主軸の第1軸および第2軸で4つの領域に分割し，ロース芯全体と各領域から脂肪面積割合，あらさ指数，最大あらさ指数，細かさ指数，筋肉平均輝度および脂肪交雑平均輝度を画像解析によって算出した．また，各画像解析形質の領域間の標準偏差を配置バランス指標とした．脂肪面積割合の配置バランス指標は，他の形質のそれよりも高い遺伝率（0.13）を示した．脂肪面積割合の配置バランス指標と，ロース芯全体のあらさ指数および細かさ指数間の遺伝相関はそれぞれ0.38および−0.49であり，脂肪面積割合の配置バランスの改良は，あらい脂肪交雑を減らし，細かい脂肪交雑を増やすことで可能となることが示された．脂肪面積割合の配置バランスに関する遺伝的趨勢は，年々良くなっていることが示されたが，特定の象限のあらさ指数と細かさ指数において，近年望ましくない遺伝的趨勢が認められた． |
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Palavras-chave: Genetic parameter; Image analysis; Marbling arrangement; Rib eye. |
| Ano: 2010 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3929 |
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| 藤田, 千賀子; 鈴木, 三義. |
| 全国的データを用いて，在群期間の遺伝率および初産泌乳形質，体型形質，および繁殖形質との遺伝相関の推定を行った．データは，社団法人家畜改良事業団に1975年から集積された1993年9月以前に誕生した雌牛の誕生，淘汰，泌乳，および社団法人日本ホルスタイン登録協会で集積された体型と血統記録である．在群期間は誕生から96ヵ月までの打ち切りデータとした．計算機の制約からすべてのデータを用いた遺伝的パラメータの推定は困難であった．そこで，同じ牛群コードをもつ記録が同一サブセットに無作為に分割されるように，遺伝率およびデータ数の限られる体型形質との遺伝相関の推定には10個，データの多い形質の遺伝相関推定には100個のサブセットを作成し，その中の10個のサブセットを用いて，制限最尤法（REML）により分散成分の推定を行った．在群期間の遺伝率は0.07と低い値が推定された．在群期間と初産泌乳形質における遺伝相関の推定値は，0.08から0.16と低いが正の関係が認められた．初産泌乳形質の向上させながら，在群期間に対する改善が可能であると考えられた．体型形質との遺伝的関連では，体の大きい個体を選抜することは負の関係にある在群期間の改良を妨げとなる恐れがあるが，正の比較的大きな遺伝相関がある肢蹄（0.37）や乳器（0.34）などを用いた間接選抜は有効であることが示唆された．在群期間と初産分娩月齢においては小さい負の値が認められ，初産から2産の分娩間隔における遺伝相関の推定値は小さい正の傾向を示したが，2産から3産の分娩間隔は0.15とやや高くなった． |
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Palavras-chave: Herd-life; Milk production; Type traits; Fertility traits; Genetic parameter. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2599 |
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| Reis Filho,João Cruz; Verneque,Rui da Silva; Torres,Robledo de Almeida; Lopes,Paulo Sávio; Raidan,Fernanda Santos Silva; Toral,Fabio Luiz Buranelo. |
| The objective of this study was to estimate genetic parameters and to evaluate the effects of inbreeding on productive and reproductive traits of dairy Gyr cattle. Single-trait animal models were used to estimate genetic parameters and solutions for inbreeding coefficients for milk (milk 305-d), fat (fat 305-d), protein (protein 305-d), lactose (lactose 305-d), and total solids (TS 305-d) yield up to 305 days of lactation, days in milk (DIM), age at first calving (AFC) and calving intervals (CI). The mean inbreeding coefficient was 2.82%. The models with linear and quadratic effects of inbreeding coefficients fitted the data better than the models without or with only linear effect of inbreeding coefficient for all traits. The increase in inbreeding... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Genetic parameter; Heritability; Inbreeding depression. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000500174 |
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| FRIDRICH, A. B.; SILVA, M. A.; VALENTE, B. D.; SOUSA, J. E. R.; CORRÊA, G. S. S.; FERREIRA, I. C.; VENTURA, R. V.; SILVA, L. O. C.. |
| Dados de pesos aos 205 (P205) e 365 (P365) dias de idade, de 46.408 animais Nelore, nascidos entre 1976 e 2000, provenientes de 530 rebanhos dos diversos estados brasileiros, foram utilizados para avaliar as interações genótipo x ambiente (IGA) e estimar herdabilidades direta e materna dos pesos pelo método da máxima verossimilhança restrita. O modelo estatístico utilizado incluiu efeitos fixos de grupo contemporâneo, idade da vaca ao parto (covariável) e efeitos aleatórios genéticos aditivo direto e materno. As correlações genéticas, estimadas para as características P205 e P365, cada uma considerada como característica distinta em cada uma das regiões Sul (S), Sudeste (SE), Centro-Oeste (CO), Norte (N) e Nordeste (NE), foram, respectivamente, 0,86 e... |
| Tipo: Artigo de periódico |
Palavras-chave: Bovino de corte; Nelore; Interação genótipo ambiente; Herdabilidade; Brasil; Canchim; Genotype environmental interaction; Genetic parameter; Heritability Brazil; Meio Ambiente; Melhoramento Genético Animal; Parâmetro Genético; Peso; Animal breeding; Beef cattle; Environment; Weight. |
| Ano: 2008 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/327077 |
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| CAVALCANTE NETO, A.; THOLON, P.; LUI, J. F.; LARA, M. A. C.; FONSECA, C.; RIBEIRO, M. N.; SARMENTO, J. L. R.. |
| Objetivou-se comparar modelos de regressão aleatória com diferentes estruturas de variância residual, a fim de se buscar a melhor modelagem para a característica tamanho da leitegada ao nascer (TLN). Utilizaram-se 1.701 registros de TLN, que foram analisados por meio de modelo animal, unicaracterística, de regressão aleatória. As regressões fixa e aleatórias foram representadas por funções contínuas sobre a ordem de parto, ajustadas por polinômios ortogonais de Legendre de ordem 3. Para averiguar a melhor modelagem para a variância residual, considerou-se a heterogeneidade de variância por meio de 1 a 7 classes de variância residual. O modelo geral de análise incluiu grupo de contemporâneo como efeito fixo; os coeficientes de regressão fixa para modelar a... |
| Tipo: Separatas |
Palavras-chave: Covariance functions; Genetic parameter; Sow; Função de covariância; Fêmea suína.; Parâmetro Genético.. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/908505 |
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| Registros recuperados: 22 | |
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