Degradabilidade in situ dos grãos de crambe, girassol e soja, e de seus coprodutos em ovinos

Abstract

In situ ruminal degradability of crambe, sunflower and soybean seeds and their by-products in sheep feeding. Ruminal degradability of crambe, sunflower and soybean grains and their by-products in sheep was evaluated by an "in situ" technique. Three 40 kg-Santa Ines fistulated sheep provided with ruminal cannula and kept in individual pens were analyzed. Feeds were incubated in the rumen in the following decreasing order 72, 48, 24, 18, 6, 3 and 0h. The potentially degradable fraction for DM in sunflower meal amounted to 73.7%, whereas it reached 34.6% in the case of CP, with medium ruminal degradation. Sunflower grain had low ruminal degradability for DM and CP (33.55 and 25.98%). Crushed soybean grain had soluble fraction of 23.15 and 7.79% respectively for DM and CP, with an effective degradability of 75.6 and 70.89%. Further, soybean whole grain presented low soluble fraction for DM and CP, respectively 4.79 and 8.73%, with low ruminal degradability. Crambe whole grain and crushed meal had the highest ADF rates, with low ruminal degradability for DM and CP. Rates for potentially degradable and soluble fraction were similar. Evaluated feeds had medium ruminal degradability, except for soybean crushed meal with the highest rate in ruminal degradability.