Navegação Ciências Agrárias por Título

Resultados 1804-1823 de 3899

    • Genetic association between longevity and linear type traits of Holstein cows 

      Kern, Elisandra Lurdes; Cobuci, Jaime Araújo; Costa, Claudio Napolis; Pimentel, Concepta Margaret McManus; Braccini Neto, José (2015) [Artigo de periódico]
      Longevity is a desirable trait in the dairy industry because of its relationship to profitability. The aim of this study was to estimate genetic parameters for longevity measurements related to productive life, or life in ...

    • Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil 

      Almeida, Tatiana Prestes de; Kern, Elisandra Lurdes; Daltro, Darlene dos Santos; Braccini Neto, José; Pimentel, Concepta Margaret McManus; Thaler Neto, André; Cobuci, Jaime Araújo (2017) [Artigo de periódico]
      This study aimed to estimate heritability, genetic, and residual correlations between reproductive traits such as age at first calving, calving interval, dry period, and first service period and linear type traits measured ...

    • Genetic avaluation for persistency of lactation in Holstein cows using a random regression model 

      Cobuci, Jaime Araújo; Euclydes, Ricardo Frederico; Costa, Claudio Napolis; Torres, Robledo de Almeida; Lopes, Paulo Sávio; Pereira, Carmen Silva (2007) [Artigo de periódico]
      A model for analyzing test day records including both fixed and random coefficients was applied to the genetic evaluation of first lactation data for Holstein cows. Data comprising 87045 test-day milk yield records from ...

    • Genetic control of agronomic traits in an oat population of recombinant lines 

      Nava, Itamar Cristiano; Duarte, Ismael Tiago de Lima; Pacheco, Marcelo Teixeira; Federizzi, Luiz Carlos (2010) [Artigo de periódico]
      Understanding the genetic control of phenotypic traits is essential to increase the efficiency of selection for adapted, high-yielding genotypes. The purpose of this study was to determine the genetic control of nine traits ...

    • Genetic divergence among interspecific Paspalum hybrids based on seed production traits 

      Lopes, Rodrigo Ramos; Franke, Lucia Brandao; Souza, Cleber Henrique Lopes de; Bertoncelli, Patricia; Graminho, Larissa Arnhold (2017) [Artigo de periódico]
      The use of genetic divergence as a basis for identifying superior individuals, with greater heterozygosity, is important in view of the difficulty when selecting of dissimilar genotypes exhibiting high average for interest ...

    • Genetic diversity and symbiotic compatibility among rhizobial strains and Desmodium incanum and Lotus spp. plants 

      Granada, Camille Eichelberger; Strochein, Marcos; Vargas, Luciano Kayser; Bruxel, Manuela; Sa, Enilson Luiz Saccol de; Passaglia, Luciane Maria Pereira (2014) [Artigo de periódico]
      This work aimed to evaluate the symbiotic compatibility and nodulation efficiency of rhizobia isolated from Desmodium incanum, Lotus corniculatus, L. subbiflorus, L. uliginosus and L. glaber plants by cross-inoculation. ...

    • Genetic diversity assessed by microsatellite markers in the amphicarpic species Trifolium polymorphum Poir. 

      Conterato, Ionara Fatima; Schifino-Wittmann, Maria Teresa; Guerra, Divanilde; Büttow, Míriam Valli; Dall'Agnol, Miguel; Dahmer, Nair (2018) [Artigo de periódico]
      Trifolium polymorphum Poir. is an amphicarpic forage legume from southern Brazil, Uruguay, Argentina, Paraguay and Chile. Information on the genetic diversity of natural populations in natural grasslands in southern Brazil ...

    • Genetic diversity of a Paspalum notatum Flügge germplasm collection 

      Fachinetto, Juliana Maria; Dall'Agnol, Miguel; Souza, Cleber Henrique Lopes de; Weiler, Roberto Luis; Simioni, Carine (2017) [Artigo de periódico]
      The objective of this study was to assess the genetic diversity among accessions of Paspalum notatum based on morphological marker traits and identify those morphological traits that contribute most to the variability among ...

    • Genetic diversity of Piaractus mesopotamicus (Characiformes: characidae) broodstocks using in the restocking program of tietê river, Brazil 

      Rodriguez-Rodriguez, Maria Del Pilar; Lopera Barrero, Nelson Mauricio; Santos, Sílvio Carlos Alves dos; Vargas, Lauro; Streit Júnior, Danilo Pedro; Ribeiro, Ricardo Pereira (2013) [Artigo de periódico]
      The restocking programs are being used more frequently as methods of fish conservation. However, the reduction in the genetic diversity can affect survival of juveniles used in this programs and cause effects on the wild ...

    • Genetic diversity of Salminus brasiliensis (Characiformes: Characidae) collected in the passage ladder of the Canoas I hydropower plant in the Paranapanema River, Brazil 

      Gomes, Patrícia Cristina; Lopera Barrero, Nelson Mauricio; Vargas, Lauro; Streit Júnior, Danilo Pedro; Povh, Jayme Aparecido; Sirol, Rodolfo Nardez; Ribeiro, Ricardo Pereira (2013) [Artigo de periódico]
      The aim of this study was to evaluate the genetic diversity of Salminus brasiliensis collected three times in the passage ladder of the hydropower plant Canoas I, in the Paranapanema River (Brazil). Fish samples were ...

    • Genetic diversity of tambaqui broodstocks in stock enhancement programs 

      Moraes Neto, Américo; Ayres, Denise Rocha; Streit Júnior, Danilo Pedro; Lopera Barrero, Nelson Mauricio; Ferraz Filho, Paulo Bahiense; Corrêa Filho, Ruy Alberto Caetano; Bignardi, Annaiza Braga; Marciano, Caroline Michele Marinho; Murari, Pâmela Juliana Furlan; Povh, Jayme Aparecido (2017) [Artigo de periódico]
      Natural populations of tambaqui (Colossoma macropomum) have significantly decreased in recent decades especially due to human extraction activities. So that the environmental impact may be reduced, the restocking of fish ...

    • Genetic evaluation of oocyte and embryo production in dairy Gir cattle using repeatability and random regression models 

      Feltes, Giovani Luis; Negri, Renata; Raidan, Fernanda Santos Silva; Feres, Luiz Fernando Rodrigues; Ribeiro, Virgínia Mara Pereira; Cobuci, Jaime Araújo (2022) [Artigo de periódico]
      The objective of this work is to estimate genetic parameters and breeding values to improve embryo and oocyte production, using repeatability and random regression models (RRM) for Gir dairy cattle. We used 11,398 records ...

    • Genetic gain in apomictic species of the genus Paspalum 

      Pereira, Emerson André; Dall'Agnol, Miguel; Saraiva, Karla Médici; Simioni, Carine; Leães, Ana Paula Steiner; Silva, José Antonio Gonzalez (2017) [Artigo de periódico]
      The objective of this work was to provide means to obtain genetic gain in apomictic species of the genus Paspalum by identifying traits that simultaneously show high correlation and heritability. Thus, to determine the ...

    • Genetic parameters and predicted gains with selection of interspecific hybrids of Paspalum for seed production 

      Lopes, Rodrigo Ramos; Franke, Lucia Brandao; Souza, Cleber Henrique Lopes de; Bertoncelli, Patricia; Graminho, Larissa Arnhold; Pereira, Emerson André (2018) [Artigo de periódico]
      The aim of this study was to estimate the genetic parameters and predicted gains with selection of interspecific hybrids of Paspalum in relation to seed production traits Data were analyzed in randomized block design, with ...

    • Genetic parameters for five traits in Africanized honeybees using Bayesian inference 

      Padilha, Alessandro Haiduck; Sattler, Aroni; Cobuci, Jaime Araújo; Pimentel, Concepta Margaret McManus (2013) [Artigo de periódico]
      Heritability and genetic correlations for honey (HP) and propolis production (PP), hygienic behavior (HB), syrupcollection rate (SCR) and percentage of mites on adult bees (PMAB) of a population of Africanized honeybees ...

    • Genetic parameters for milk production by using random regression models with different alternatives of fixed regression modeling 

      Cobuci, Jaime Araújo; Costa, Claudio Napolis; Braccini Neto, José; Freitas, Ary Ferreira de (2011) [Artigo de periódico]
      Records of test-day milk yields of the first three lactations of 25,500 Holstein cows were used to estimate genetic parameters for milk yield by using two alternatives of definition of fixed regression of the random ...

    • Genetic parameters for production traits in primiparous Holstein cows estimated by random regression models 

      Biassus, Igor de Oliveira; Cobuci, Jaime Araújo; Costa, Claudio Napolis; Rorato, Paulo Roberto Nogara; Braccini Neto, José; Cardoso, Leandro Lunardini (2011) [Artigo de periódico]
      The objective of this study was to estimate genetic parameters for milk, fat and protein yields of Holstein cows using 56,508; 35,091 and 8,326 test-day milk records from 7,015, 4,476 and 1,114 cows, calves of 359, 246 and ...

    • Genetic parameters for test day milk yield of first lactation Holstein cows estimated by random regression using Legendre polynomials 

      Costa, Claudio Napolis; Melo, Claudio Manoel Rodrigues de; Packer, Irineu Umberto; Freitas, Ary Ferreira de; Teixeira, Nilson Milagres; Cobuci, Jaime Araújo (2008) [Artigo de periódico]
      Um total de 263.390 registros de produção de leite do dia do controle (PC) de 32.448 primeiras lactações de vacas da raça Holandesa com partos entre 1991 e 2001, disponibilizados pela Associação Brasileira de Criadores de ...

    • Genetic parameters for type traits in Holstein cows in Brazil 

      Campos, Rafael Viegas; Cobuci, Jaime Araújo; Costa, Claudio Napolis; Braccini Neto, José (2012) [Artigo de periódico]
      Data from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, ...

    • Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers 

      Claus, Luis Afonso Marques; Koetz Junior, Celso; Roso, Vanerlei Mozaquatro; Borges, Marcelo Henrique Favaro; Barcellos, Julio Otavio Jardim; Ribeiro, Edson Luis de Azambuja (2017) [Artigo de periódico]
      This study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data ...