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EnglishThe objective of this work was to verify the MS production and nutritive value of five clones of Pennisetum. The samples were taken from an utile area of 2,0 m2 in each plot. After clipping the forage to standarize, four cuts were performed with 60-d intervals. In each plot, three tillers were oven-dried and grinded for laboratory analysis. The following response variables were determined: dry matter concentration (MS), crude protein (PB), neutral detergent fiber (FDN), acid detergent fiber (FDA), ether extract (EE), mineral matter (MM), in vitro dry matter digestibility (DIVMS), total carbohydrates (CHOT), and non-fibrous carbohydrates (CNF). The evaluated genotypes presented average MS yield of 1.7 and 2.1 t/ha/cut, for leaf blade and stem, respectively. Average nutritive value was 21.1 and 15.1% for MS; 9.1 and 5.3% for PB; 73.2 and 77.7% for FDN; 40.3 and 47.4% for FDA; 9.6 and 11.6% for MM; 1.9 and 0.7% for EE; 56.2 and 56.3% for DIVMS; 79.3 and 82.4% for CHOT; and 11.4 and 9.7% for CNF, in leaf blades and stem, respectively. The clones presented medium to high heritability, similar biomass production and nutritive value, when harvested at 60 days of regrowth in the conditions of the forest zone of Pernambuco. portuguesObjetivou com este trabalho verificar a producao e valor nutritivo de cinco genotipos de Pennisetum (IRI-381, Venezuela, Elefante B, HV-241 e Hexaploide) sob corte na Zona da Mata Seca de Pernambuco. As amostras foram obtidas de uma area util de 2,0 m2, num delineamento em blocos casualizados com 6 repeticoes. Apos o corte de uniformizacao, efetuaram-se quatro cortes a intervalos de 60 dias. Foi tomada uma amostra de tres perfilhos de cada parcela. Foram avaliados os percentuais de materia seca (MS), proteina bruta (PB), fibra em detergente neutro (FDN), fibra em detergente acido (FDA), extrato etereo (EE), materia mineral (MM), digestibilidade in vitro da materia seca (DIVMS) carboidratos totais (CHOT) e carboidratos nao fibrosos (CNF). Os genotipos avaliados apresentaram rendimento medio de MS de lâminas foliares de 1,7 t/ha/corte e de colmos de 2,1 t/ha/corte, nao havendo diferenca entre clones (p>0,05). Nas lâminas foliares e nos colmos, respectivamente, observou-se 21,1 a 15,1% para MS; 9,1 a 5,3% para PB; 73,2 a 77,7% para FDN; 40,3 a 47,4% para FDA; 9,6 a 11,6% para MM; 1,9 a 0,7% para EE; 56,2 a 56,3% para DIVMS; 79,3 a 82,4% para CHOT e 11,4 a 9,7% para CNF. Os clones apresentaram de media a alta herdabilidade e rendimento forrageiro e valor nutritivo semelhantes, quando manejados aos 60 dias de idade nas condicoes da Zona da Mata Seca de Pernambuco. |
