Revista Brasileira de Zootecnia
On-line version ISSN 1806-9290
VELOSO, Cristina Mattos et al. Ruminal degradabilities of dry matter and crude protein of tropical forages. R. Bras. Zootec. [online]. 2006, vol.35, n.2, pp. 613-617. ISSN 1806-9290. http://dx.doi.org/10.1590/S1516-35982006000200039.
In situ DM and CP degradabilities of leaflets of three tropical legumes: leucaena (Leucaena leucocephala (Lam.) de Wit), pigeon pea (Cajanus cajan (L.) Millsp.), and glycine (Neonotonia wightii) and of leaves of two other tropical forages: ramie (Boehmeria nivea (L.) Gaudich) and cassava (Manihot esculenta Crantz) were determined in this trial. Three grams of pigeon pea, glycine, and ramie and 5 g of leucaena and cassava were incubated in the rumen of four steers for 3, 6, 12, 18, 24, and 48 hours. Effective degradabilities of DM and CP assuming a passage rate of 5%/hour were greater than 60%. Degradation rates, except for pigeon pea, were also high in this study. Forages had high total digestibility of protein (greater than 88%), except for pigeon pea leaflets that was 69%. Pigeon pea was the forage with the lowest potential for ruminal protein degradation.
Keywords : cattle; ruminal incubation; legumes.