DEGRADABILIDADE IN SITU DE SILAGENS DE MILHETO EM OVINOS

Abstract

The objective of this study was to evaluate and to comparein situ dry matter (DM), crude protein (CP) and neutral detergentfiber (NDF) degradabilities of three pearl millet genotypes silages(BRS-1501, NPM-1 e CMS-3), incubated at 6, 12, 24, 48 and 96hours in sheep. The experimental design was a randomized blockin split plot arrangement, and the means compared by SNK test at5% significance level. Values of effective degradability at 2.0%/h,5.0%/h and 8.0%/h passage rates were: 48.5%, 39.6% and 35.8%for BRS-1501 silage, 46.3%, 38.1% and 35.0% for NPM-1 silageand 47.8%, 40.2% and 36.9% for CMS-3 silage, respectively. Thehighest degradation rate (2.08% / h), solubility (74.4%) and effectivedegradability of CP were observed for CMS-3. The potentialdegradability (A) of NDF was equal to the potentially degradablefraction (B1) in all silages, whose values were 52.3% (BRS-1501),57.6% (NPM-1) and 46.6% (CMS-3). CP fraction of pearl milletsilages presented high solubility and CMS-3 silage showed betterquality of this fraction. Low NDF degradabilities were observedfor all silages. According to the findings of this work, the BRS-1501 and CMS-3 silages presented better nutritional value than theNPM-1 due to their highest effective degradabilities.

Keywords

• Nutritive value
• roughage
• ruminants
• supplementation