Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-10-26T13:54:10Z No. of bitstreams: 2 carla_silva_chaves.pdf: 465218 bytes, checksum: 61fac981c650f80191edf0c6f87da7fc (MD5) license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-10-26T13:55:12Z (GMT) No. of bitstreams: 2 carla_silva_chaves.pdf: 465218 bytes, checksum: 61fac981c650f80191edf0c6f87da7fc (MD5) license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) / Made available in DSpace on 2015-10-26T13:55:12Z (GMT). No. of bitstreams: 2 carla_silva_chaves.pdf: 465218 bytes, checksum: 61fac981c650f80191edf0c6f87da7fc (MD5) license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Previous issue date: 2011 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / O estudo foi conduzido no campo experimental da Embrapa Gado de Leite (Coronel Pacheco, MG), com objetivo de avaliar as caracter?sticas nutricionais, estruturais e produtivas de gen?tipos de capim-elefante sob estrat?gias de lota??o intermitente. Utilizou-se o esquema fatorial 2x2x2 (dois gen?tipos, CNPGL 92-198-7 e CNPGL 00-1-3; duas intercepta??es luminosas ao corte, 90 e 95%; duas alturas de res?duo p?s-pastejo, 30 e 50 cm), no delineamento inteiramente casualizado, com tr?s repeti??es. O rebaixamento do dossel foi realizado via pastejo direto por novilhas mesti?as Hol?ndes x Zebu utilizando a t?cnica ?mob grazing?. As caracter?sticas estruturais e produtivas foram avaliadas a partir de coletas realizadas rente ao solo e o valor nutritivo foi determinado no material amostrado. O gen?tipo CNPGL 92-198-7 apresentou menor per?odo de descanso e mais ciclos de pastejo, refletindo em maior produ??o de forragem dentro da esta??o de crescimento. O manejo com res?duo p?s-pastejo com 30 cm resultou em melhor rela??o l?mina/colmo e consequente percentagem de l?mina foliar, com superioridade do gen?tipo CNPGL 92-198-7 sobre o gen?tipo CNPGL 00-1-3. O gen?tipo CNPGL 92-198-7 apresentou superioridade em rela??o ao gen?tipo CNPGL 00-1-3 no que ser refere ? taxa de ac?mulo de forragem e n?mero de perfilhos. O gen?tipo CNPGL 92-198-7 apresentou maior teor de PB e DIVMS e menor teor de FDN sob 90% de intercepta??o luminosa e res?duo p?s-pastejo de 30 cm. O gen?tipo CNPGL 00-1-3 obteve melhor valor nutritivo sob 95% de intercepta??o luminosa. O gen?tipo CNPGL 92-198-7 apresentou maior taxa de degrada??o na IL de 90% e no res?duo p?s-pastejo de 30 cm, j? o gen?tipo CNPGL 00-1-3 obteve maior taxa de degrada??o na IL de 95% sob 30 cm de res?duo p?s-pastejo. Recomenda-se o uso do gen?tipo CNPGL 92-198-7, manejando este sob IL de 95% e res?duo p?s-pastejo de 30 cm que ? a condi??o que esta forrageira atinge sua maior produtividade. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2011. / ABSTRACT The study was conducted at Embrapa Gado de Leite (Minas Gerais, Brazil), to evaluate the nutritional characteristics, structural and production of elephant grass genotypes under intermittent stocking strategies. There had been used a 2x2x2 factorial (two genotypes, CNPGL 92-198-7 and CNPGL 00-1-3; two light interceptions to cut, 90 and 95%, two post-grazing residue heights, 30 and 50 cm) in a completely randomized design with three replications. The lowering of the canopy was accomplished via direct grazing of crossbred Holstein x Zebu heifers using the technique "mob grazing". The structural and productive characteristics were assessed from samples taken at ground level and nutritive value was determined in the sampled material. The genotype CNPGL 92-198-7 presented a shorter rest period and more grazing cycles, resulting in a higher forage production in the growing season. The management with post-grazing residue of 30 cm height resulted in better value for blade/stem and a resulting percentage of leaf blades, with superiority of genotype CNPGL 92-198-7 compared to genotype CNPGL 00-1-3. The genotype CNPGL 92-198-7 has showed to be superior to the genotype CNPGL 00-1-3 in relation to forage accumulation rate and number of tillers. The genotype CNPGL 92-198-7 has a higher content of CP and IVDMD and lower NDF content under 90% light interception and post-grazing residue height of 30 cm. The genotype CNPGL 92-198-7 showed the highest degradation in 90% IL, and height post-grazing of 30 cm, as the genotype CNPGL 00-1-3 had the highest rate of degradation in IL of 95% under 30 cm of height post-grazing. It is recommended the use of genotype CNPGL 92-198-7, handling this under 95% IL and height post-grazing residue of 30 cm which is the condition that the forage is at its highest productivity.