23
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Correlações genéticas e fenotípicas entre características de conformação e produção de leite em bovinos da raça Pardo-Suíça no Brasil Translated title: Genetic and phenotypic correlations among type traits and milk yield of Brown Swiss Cattle in Brazil

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Foram avaliados dados de classificação para tipo fornecidos pela Associação Brasileira de Criadores de Gado Pardo-Suíço com o objetivo de avaliar os efeitos de fatores não-genéticos, estimar a herdabilidade e as correlações genéticas e fenotípicas das características lineares de tipo, características de classificação e a classificação final, bem como avaliar as correlações das características de tipo com a produção de leite. Para o estudo dos fatores não-genéticos foi utilizado o método dos quadrados mínimos, utilizando-se o procedimento GLM do SAS, e, para a estimativa da herdabilidade e correlações genéticas e fenotípicas, foi utilizado um modelo animal. Os componentes de variância e (co)variância foram obtidos com o programa MTDFREML (Multiple Trait Derivative Free Restricted Maximum Likelihood), utilizando a metodologia de máxima verossimilhança restrita livre de derivadas. Os efeitos não-genéticos influenciaram a avaliação da maioria das características de tipo, devendo ser considerados nas avaliações de conformação de bovinos desta raça. As estimativas de herdabilidade obtidas sugerem a possibilidade de ganhos genéticos moderados advindos da seleção para características de tipo. Devido às altas correlações genéticas entre as características lineares de tipo, programas de melhoramento para características de conformação podem ser implementados sem a necessidade de inclusão de todas as características. As correlações genéticas observadas entre algumas características de tipo e a produção de leite sugerem a participação destas na formação de índices de seleção para animais desta raça.

          Translated abstract

          Data of type classification from Brown Swiss Cattle Breeder`s Association of Brazil were used to evaluate non-genetic factors, heritability and genetic and phenotypic correlations of the linear type traits, classification traits and final score, as well as to evaluate correlations of type traits and milk yield. For the study of non-genetic factors was utilized the least square metolology using the GLM procedure of SAS, and, for estimate of heritability and genetic and phenotypic correlation was used an animal model. The REML metodology was used to obtain variance and covariance components to estimate heritability and genetic and phenotypic correlations. The non-genetic factors influenced most of the type traits and should be considered in the type evaluation of cattle of this breed. Heritability estimates suggest the possibility of moderate genetic gain for selection of type traits. Genetic correlations among some type traits were high, suggesting that some of them could be excluded from the used classification system. The genetic correlations between some type traits and milk yield suggest the participation of these in the elaboration of selection index of animals of this breed.

          Related collections

          Most cited references31

          • Record: found
          • Abstract: found
          • Article: not found

          Genetic and phenotypic correlations between linear type traits and production traits in Holstein-Friesian dairy cattle

          First lactation production and linear type records of 72 559Holstein-Friesian cows, calving from 1982 to 1989, were analysed by multivariate restricted maximum likelihood, using a sire model. The data comprised offspring of 1066 randomly used sires, and 91 proven i.e. widely used bulls. All phenotypic correlations between the type traits and the yield traits were small, but moderate genetic correlations were obtained between milk, fat and protein yield and angularity (~—0·43) and between the yield traits and udder depth (~0·44), indicating that higher yielding heifers are more angular and have deeper udders. The heritabilities of the type traits were in line with previous analyses, but those for milk, fat and protein yield were rather high at 0·47, 0·52 and 0·45 respectively
            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            SAS System for Linear Models

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Influence of Involuntary Culling on Optimum Culling Rates and Annualized Net Revenue

                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbz
                Revista Brasileira de Zootecnia
                R. Bras. Zootec.
                Sociedade Brasileira de Zootecnia (Viçosa )
                1806-9290
                December 2003
                : 32
                : 6
                : 1419-1430
                Affiliations
                [1 ] Universidade Federal de Viçosa Brazil
                [2 ] Faculdade de Ciêcias Agrárias do Pará
                [3 ] Universidade Federal de Viçosa Brazil
                [4 ] Universidade Estadual do Oeste do Paraná Brazil
                [5 ] Universidade Estadual de Santa Cruz
                [6 ] Associação de Criadores de Gado Holandês de Minas Gerais Brazil
                Article
                S1516-35982003000600017
                10.1590/S1516-35982003000600017
                5d141929-816c-401f-89c1-baafa73d562d

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-3598&lng=en
                Categories
                AGRICULTURE, DAIRY & ANIMAL SCIENCE
                VETERINARY SCIENCES

                Animal agriculture,General veterinary medicine
                Brown Swiss,genetic parameters,type traits,características de tipo,parâmetros genéticos,Pardo-Suíço

                Comments

                Comment on this article