Rumen degradation of oats and corn at two rumen environments and degradation of wheat bran, rice bran and sugar beet pulp

Ernesto Jahn B.1 , Fernando 8órquez L.2, María Isabel Monsalve S.2, Gustavo Contreras C.2, Gabriel Ormeño R.1 y Héctor Manterola B.3

In the first trial, the in situ rumen degradation of oats and maize grain was evaluated. 80th grains were studied under two different rumen conditions produced by high and low concentrate levels. Four Hostein-Friesian cows with rumen fistulae in their last third of prenancy were used. The second trial, the in situ degradation of wheat bran, rice bran and sugar beet pulp was evaluated. Three Holstein cows were used. Five 9 of each feedstuff was incubated in nylon bags of 15 x 9 cm with 1600 porous per cm during 1, 2, 4, 8, 12, 24, 36 and 48 hours. Each sample was analyzed for its contents of dry matter, protein and acid detergent fibre. In the first trial the potential maximum disappearance values in maize grain, were: 92, 83 and 66% for dry matter, protein and acid detergent fiber. In contrast, for similar components, the values for oat grain were: 75, 93 and 26%, respectively. Both grains had different degradation curves (P < 0.05), and in both environments the pH differences were small. Level of concentrate did not affect dry matter and crude degradation. In the second trial the dinamics of the digestion was different between the three feedstuffs evaluated and potential disappearance of the wheat bran, rice bran and sugar beet pulp were: 74, 63 and 92% for dry matter; 81,71 and 76% for protein; 31, 16 and 86% for acid detergent fiber, respectively.

Keywords: in situ, digestibiliy, corn, oats, beet pulp, wheat bran.
1 Centro Regional de Investigación Quilamapu (INIA). Casilla 426, Chillán, Chile.
2 Universidad de Concepción, Departamento Producción Animal, Casilla 537, Chillán, Chile.
3 Universidad de Chile, Casilla 1004, Santiago, Chile.