Assessing biomass production and crude protein content of leucaena as cattle feed under different land types in eastern Indonesia
Yusuf Akhyar Sutaryono, Dahlanuddin Dahlanuddin, Dedi Supriadi, Ryan Aryadin Putra, Ruth Stella Thei
University of Mataram, Fac. of Animal Science; Dept. of Animal Nutrition, Indonesia
Cattle fattening based on Leucaena (Leucaena leucocephala cv Tarramba) has been adopted widely in eastern Indonesia as it has been proven to significantly improve cattle growth and farm income. However, farmers often fail to match the number cattle they raise with the availability of leucaena, resulting in shortage of Leucaena to formulate a balanced diet especially in the dry season. An experiment was conducted to measure biomass production and crude protein (CP) content of Leucaena (around three years of age, 1×3 m planting distance) on 6 sites in Sumbawa Island, representing flat land, tilted land (10-15o) and slope land (30-45o). Data were collected 4 times in a year to cover early wet season, late wet season, early dry season and late dry season. The annual dry matter (DM) production of the leucaena was 12.5, 7.7 and 5.9 tons/ha for the flat, tilted and slope land respectively. The respective biomass production in the wet season was 5.40, 2.78 and 2.21 kg fresh weight/tree. The fresh biomass production declined significantly to 2.21, 1.02 and 0.70 kg/tree respectively in the dry season. The percentage of edible part in rainy season was similar at around 70% of total biomass production for all land types. During the dry season, the edible part remaied the same at around 70% for the flat land but declined to around 60% in tilted and sloping land types. The DM contents were similar at 24-26% on all land types but increased significantly to around 33% in the dry season only for the Leucaena planted on slope, while the organic matter content remained the same at about 91% DM. The CP contents of Leucaena were significantly different between land types; 20.68% for flat land, 19.75% for tilted land and 18.76% for slope land. The values for biomass production and CP content of Leucaena on the flat, tilted and slope lands are a very valuable reference for calculating leucaena availability and for formulating balanced cattle diet in these land types during the wet and dry seasons.
Keywords: Biomass production, land type, Leucaena, protein content
Contact Address: Yusuf Akhyar Sutaryono, University of Mataram, Fac. of Animal Science; Dept. of Animal Nutrition, Jl. Majapahit no 62, 83125 Mataram, Indonesia, e-mail: ysf_25yahoo.com