Use of morphologic descriptors and trait heritability in dwarf elephant grass clonesABSTRACT -The experiment was carried out with the objectives to evaluate the use of morphologic descriptor in the characterization and selection of dwarf elephant grass genotypes, and to evaluate the heritability of the evaluated traits. Nine dwarf elephant grass clones were used (Taiwan A.146 -2.14, Taiwan A.146 -2.27, Taiwan A.146 -2.37, Taiwan A.146 -2.114, Merker México -6.2, Merker México -6.5, Merker México -6.31, cv. Mott, and CNPGL92F198.7) was allotted to a randomized complete block design was used with three replications. The morphologic descriptors were applied every 60 days after the staging cut. A total of five cuts were performed at 60-day intervals using a height of 10 cm from ground level. Among the evaluated dwarf elephant grass clones the tallest ones were more desirable, and this trait should be considered at the moment of selection. Heritability estimate was high for all evaluated traits of dwarf elephant grass, varying from 66% for sheath wax to 100% for mid-rib color. The Taiwan A.146 -2.37 clone was similar to the Mott cultivar. Heritability values showed genetic variability among clones, detected at 60 days regrowth. Some of the used morphologic descriptors allowed characterization of the evaluated genotypes. The clones Taiwan A. 146-2.27, Taiwan A. 146-2.37, Taiwan A. 146-2.114, and Merker México 6.31were the tallest and showed greater total tillering intensity, and were more desirable, presenting greater potential for use under cutting.Key Words: desirability, dwarf elephant grass, forage breeding IntroduçãoO capim-elefante (Pennisetum purpureum Schum) tem sido bastante estudado em programas de melhoramento genético em todo o Brasil visando à seleção de materiais superiores e adaptados a cada realidade ambiental do País (Freitas et al., 2004). A aplicação dos descritores morfológicos de capim-elefante visa, geralmente, caracterizar novos R. Bras.
rendimentos para ensilagem e sua composição bromatológica. Sobre a prática da ensilagem foi feito amplo levantamento sobre os trabalhos que discutem suas etapas e a correlação entre a idade de corte para ensilagem e a qualidade da matéria obtida após o processo de ensilagem. Avaliação de indicadores de qualidade da silagem como teores de matéria seca (MS), Proteína Bruta (PB), nitrogênio amoniacal (N -NH3), poder tampão, carboidratos solúveis (CHOs) e pH. Principais grupos de bactérias fermentadoras das silagens, bactérias ácidoláticas (BAL) e bactérias ácido-butíricas (BAB). Ampla literatura foi consultada para verificação dos principais aditivos atribuídos ao capim elefante e sua influência sobre os aspectos fermentativos, nutricionais e a digestibilidade da silagem obtida. Palavras-chave: Ensilagem; Conservação; Forragem. Use of different additives in elephant grass silage (Pennisetum purpureum, Schum.
SOUZA, R.A. et al. As tendências de mercado da carne suína. PUBVET, Londrina, V. 5, N. 25, Ed. 172, Art. 1163, 2011 PUBVET, Publicações em Medicina Veterinária e Zootecnia. As tendências de mercado da carne suína
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