Abstract
The aim of this study was to evaluate forage quality and absorption of heavy metals in grasses of grazing lands in mine revegetation area. Grazing land was dominated by Brachiaria decumbens (BD), which occupied about 87% in the pasture’ syielding ability of 14.8 Mg DM/ha/year, followed by Centrocema pubescens (CP), Calopogonium mucunoides (CM) and Imperata cylindrica (IC) at 6, 4 and 3%, respectively. Both of in vitro dry matter digestibility and organic matter digestibility were the highest in BD and CM, followed by CP and the lowest in IC. Structural carbohydrates of cellulose and hemicelluloses were the highest in BD, contrary to Acid Detergent Lignin (ADL) concentration, which was the highest in IC and the lowest in BD, while CP and CM showed the middle in ADL and cellulose concentrations among the four forage species. Heavy metals of nickel (Ni), chromium (Cr) and lead (Pb) were detected in the order of Ni > Cr > Pb in the grasses examined and harvested on mine-revegetation area in Sorowako, Indonesia.
Highlights
It is important to support the national meat selfsufficiency program in Indonesia and one of the essential factors that must be prepared is the availability of forages to livestock
The characters of forage quality studied were In Vitro Dry Matter Digestibility (IVDMD) and Organic Matter Digestibility (IVOMD), estimated by the pepsincellulase assay (Goto and Minson, 1977) method and Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), by the method of Goering and Van Soest (1970)
Grazing land was dominated by Brachiaria decumbens (BD), which occupied about 87% from 14.8 Mg DM/ha/year of the pasture yielding ability, followed
Summary
It is important to support the national meat selfsufficiency program in Indonesia and one of the essential factors that must be prepared is the availability of forages to livestock. The decreasing trends of farmland and grazing land due to property and urbanization caused more difficulty in forage supply for livestock. Grasses are the most commonly seeded plants in revegetation programs and produce large amounts of biomass, adapted to initiate regrowth rapidly after mowing or grazing. Grasses have fibrous root systems that hold soil particles in place, thereby controlling erosion (Skousen and Zipper, 2010). Grasses are obtained readily and at reasonable cost and are welladapted to the infertile, droughty and/or acidic sites often associated with mined areas (Skousen and Zipper, 2010).
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