Mestrado em Ciências Veterinárias
URI Permanente para esta coleção
Nível: Mestrado Acadêmico
Ano de início: 2008
Conceito atual na CAPES: 4
Ato normativo: Homologado pelo CNE (PORTARIA 609 de 14 de março de 2019) Publicado no D.O.U - 18/03/2019
Periodicidade de seleção: Semestral
Área(s) de concentração: Ciências Veterinárias
Url do curso: https://cienciasveterinarias.ufes.br/pt-br/pos-graduacao/PPGCV/detalhes-do-curso?id=1451
Navegar
Navegando Mestrado em Ciências Veterinárias por Autor "Almeida, Maria Izabel Vieira de"
Agora exibindo 1 - 3 de 3
Resultados por página
Opções de Ordenação
- ItemCaracterísticas produtivas da população melhorada EGLRuzi#01 e da cultivar Kennedy de Brachiaria ruziziensis sob pastejo(Universidade Federal do Espírito Santo, 2018-02-27) Delprete, Sâmila Esteves_x000D_ .; Moreira, Gisele Rodrigues; Almeida, Maria Izabel Vieira de; Cunha, Gláucio de MelloThe objective was to evaluate productive characteristics under grazing of an improved population of Brachiaria ruziziensis, called EGLRuzi#01, comparing it with the Kennedy commercial cultivar, aiming to evaluate the possibility of launching EGLRuzi#01 as a new forage cultivar. The experiment was implemented in the Experimental Field José Henrique Bruschi (CEJHB) of Embrapa Gado de Leite, in Coronel Pacheco, Minas Gerais State, Brazil. An improved population of B. ruziziensis (EGLRuzi#01) obtained in the third cycle of intrapopulational recurrent selection of the Embrapa Gado de Leite forage breeding program and Kennedy comercial cultivar as a control was evaluated. The variables evaluated were: entrance height; soil cover; tiller population density; leaf percentage, stem and dead material; leaf:stem ratio; pre-grazing forage mass; exit height and post-pastage forage mass. The experimental design was a randomized block design, with two treatments (improved population EGLRuzi#01 and Kennedy cultivar), two blocks and five sub-blocks for the first period and twelve sub-blocks for the second period. Each sub-block was composed of the evaluation dates. The data were submitted to variance analysis (P<0.05) using the SAS MIXED procedure and the maximum likelihood method for estimation of variance components, considering fixed treatment effect and random effects of block and sub-block. There was no significant difference (P<0.05) regarding the entrance height of the animals in the pickets, however, there was a significant difference (P<0.05) for exit height. The exit heights for the EGLRuzi#01 improved population were above the predetermined of 30 cm for the first period and 25 cm for the second. This fact resulted in a lower leaf percentage and higher dead material in the second period (P<0.05). For the variables soil cover, leaf:stem ratio, pre-grazing ans post-grazing forage mass there was no significant difference (P<0.05). There was significant difference (P<0.05) for the tiller population density in the first period, in which the EGLRuzi#01 improved population presented higher value, with 27.90% more tillers per m² in relation to the Kennedy cultivar, a feature that is directly related to pasture perenniality and is related to pasture productivity, which makes interesting the higher tillering characteristic of EGLRuzi#01. Thus, the improved population of B. ruziziensis (EGLRuzi#01) presents superior productive characteristics to the cultivar Kennedy, like the greater tiller population density, that makes it promising to be launched like new commercial cultivar.
- ItemEficiência da seleção visual para produção de massa verde de forragem em Cynodon spp.(Universidade Federal do Espírito Santo, 2018-02-28) Fregulhia, Letícia Mária Costa; Benites, Flávio Rodrigo Gandolfi; Moreira, Gisele Rodrigues; Almeida, Maria Izabel Vieira de; Souza Sobrinho, Fausto deVisual selection is used constantly in the initial stages of selection cycles in breeding programs, aiding in the selection or disposal of genotypes. However, its efficiency in identifying superior genotypes has been questioned in some cultures. Thus, the objective of this work was to verify the efficiency of visual selection for green forage mass production in Cynodon spp. clones. For this purpose, 140 clones of Cynodon spp. together with the Tifton 85 (Cynodon sp.) and Jiggs (Cynodon dactylon) controls, in an enlarged block experiment. The evaluated characters were a note of vigor regarding green mass production and green forage mass production (kg), analyzed using the mixed model approach REML / BLUP. The efficiency of visual selection was estimated by the number of coincidences between plants when different selection strategies were performed. Genetic gains were estimated via genotype values of forage green mass production and vigor score, in the selection intensities where coincidence was obtained between selected plants above 80%. The selection of the BLUP means of the production of green forage mass (BLUP GMP) through selection of the BLUP averages of the vigor note (BLUP VN) resulted in the highest coincidence index (90%) in the selection intensity of 45%. The highest genetic gain was obtained in the intensity of selection of 35%, independent of the strategy. It is concluded that the visual selection in clones of Cynodon spp. for the production of green forage mass is efficient in discarding lower clones in the initial stages of a cycle of selection of the genetic improvement program of the genus Cynodon.
- ItemFaixas de classificação do coeficiente de variação para avaliação da precisão em experimentos com Brachiaria spp.(Universidade Federal do Espírito Santo, 2016-02-26) Taira, André; Moreira, Gisele Rodrigues; Almeida, Maria Izabel Vieira de; Barioni, GrazielaThe coefficient of variation (CV%) is a measure of relative dispersion used traditionally for the validation experiments. Through the method proposed by Garcia (1989) sought to new CV% rating bands for the validation experiments of the most diverse species of interest and response variables in agricultural sciences, but this depended on the normal distribution of CV% 'if thus limiting the availability of classifying a given variableresponse. Subsequently to the method of Costa et al. (2002) it was possible to sort groups of CV% of unknown distributions. Due to these studies the 20% value traditionally used for the validation experiments have been replaced by other reference values in the CV%. The only CV% rating bands for existing grasses prior to this work are those of Clement and Muniz (2002) based on publications between 1950 and 1990. According to the above, the objective was to propose new tracks classification of the coefficient of variation for the response variable for Brachiaria spp. Thus, CV% are tabulated-'s a response variable, experimental unit, and forage species in spreadsheets. We selected the most frequent variables in scientific articles indexed in Scielo, Directory Open Access Journals, Google Academics and Associação Brasileira de Zootecnia from 2000 to 2014. We tested the normality of the coefficients of variation with the Kolmogorov-Smirnov test modified by Lilliefors and Shapiro-Wilk, both the 5% significance level. We used the methods of obtaining Garcia classification tracks (1989) for CV% 's normal distribution, and the Costa et al. (2002) for all other with unknown distribution. For these CV's% sought to validate the tracks obtained by the method of Costa et al. (2002) using the chi-square adherence test corrected by Yates factor and when it was not used the Fisher's exact test, both at 5% significance. It is concluded that the coefficient of variation classification ranges for the variables crude protein, fiber, neutral detergent, acid detergent fiber, dry matter intake of pasture intake of total dry matter, leaf / culm, consumption of organic matter, dry matter intake of pasture intake of total dry matter, crude protein intake, fiber intake neutral detergent consumption of non-fiber carbohydrates, total digestible nutrients, grazing time, time rumination, and idle time obtained in this work can be recommended for the genus Brachiaria spp.