Valor nutritivo de cultivares de capim-elefante (Pennisetum purpureum Schum. ) sob condições de pastejo / Elephant grass (Pennisetum purpureum, Schum. ) cultivars nutritive value under grazing conditions

RESUMO

Com objetivo de avaliar as cultivares (cvs.) de capim-eletante: Merckeron Pinda, Mercker-86-México, Porto Rico e Cameroon sob pastejo, conduziu-se este experimento em Santa Maria-RS. Para avaliação, foram Utilizadas novilhas e vacas em lactação da raça Holandês em pastejo rotativo. O valor nutritivo foi estimado a partir dos teores de proteína bruta (PB) e coeficientes de digestibilidade in vitro da matéria orgânica (DIVMO) determinados sobre amostras da parte aérea das plantas, colmos, tolhas e extrato da forragem paste jada. As cvs. apresentaram valor nutritivo bastante equilibrado, diferindo quanto aos teores de PB das folhas e DIVMO destas e do extrato da forragem pastejada: obtendo os melhores resultados com as cvs. Merckeron Pinda e Mercker-86-México.

ABSTRACT

To evaluate four different elephant grass cultivars (cvs.): Merckeron Pinda, Mercker-86-Mexico, Porto Rico and Cameroon, under grazing conditions. Holstem heiters and cows were used in a rotational grazing system. This work was undertaken at the experimental area of the Animal Science Department, Federal University Campus, Santa Maria-RS. Nutritivo value was estimated through crude protein (PB) and in vitro organic matter digestibility (DIVMO) coefficients from samples of the aerial part of plants, stalks and leaves, and an extract of the area being pasteured, collected by hand, simulating grazing. The cvs. have shown very similar nutritivo values, but there were differences in PB for leaves and DIVMO for leaves and for the extract of the simulated grazing; Merckeron Pinda and Mercker-86-Mexico were the best.