Produção de forragem, composição botânica e valor nutritivo de pastos nativos do Massif Central- França

• Autor(a) principal: Rodrigues, Augusto Manoel
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• Texto Completo: http://repositorio.uem.br:8080/jspui/handle/1/1602
• topic: Plantas forrageiras; Fatores edafoclimáticos; Plantas nativas; Forragicultura; Forragem; Digestibilidade; Intensidade de exploração; Fertilização; Gramínea; Massif Central; França.; Forage plants; Edaphoclimatic factors; Native plants; Forage; Forage; Digestibility; Intensity of exploitation; Fertilization; Grassy; Massif Central; France.; Ciências Agrárias; Zootecnia

This study aimed to characterize the variability of herbage yield and nutritive value (crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and acid detergent lignin (ADL) and organic matter digestibility) of milêniograss (Brazil) and of the meadows of the Central Massif (France) in relation to fertilization and production systems. The experiment was conducted from spring to summer of 2005 in farm milk in the region of Puy of Dome and in the French National Institute for Agricultural Research (Inra), in the Auvergne region of the Massif Central of France. Samples were collected at two harvest dates along the first cycle of growth during 2005 and 2006 (at heading and at flowering of Dactylis glomerata, respectively). The chemical composition analyses and feed value were estimated by Near Infrared Spectroscopy (Nirs). The results let classify the meadows in six groups in relation to the characteristics of the environment (altitude and rainfall), fertilization practices, nutritive value and botanical composition. The six groups of meadows showed variations in the digestibility of 65 to 77% in function of the climatic effects and production system. The herbage yield in 2005 was 2.98 t ha-1 of DM differing of 2006 with yield of 2.58 t ha-1 of DM. The groups G1, G3 and G4 of meadows had higher yield herbage in relation to the treatment of group G6. The lower intensity exploration had lower nutritive value at the first harvest date. However, the nutritive value decreases more slowly than for the most intensive treatments. The organic matter digestibility of lower intensity exploration was higher than the most intensive treatments at the second harvest date. Based on the results, it may conclude that the high intensity of exploration presents reduction of the diversity of meadows from temperate climate increasing the participation of grasses and reducing the participation of forbs. This experimentation allows enlarging the nutritive value references of native grasses for the tables of feed values of INRA. In addition, it will contribute to the improvement of sustainable production of meat and milk of the Auvergne farms.