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1st Int. Transborder Conf. of the Timor Island: Timor %u2013 Science without borderDili, 7-8 May 202526Fibre Components and Their Relation to In Vitro Organic Matter Digestibility of Tropical Feedstuff Commonly Fed to Ruminants in The Province of East Nusa Tenggara, IndonesiaI G. N. Jelantik*, M. L. Mullik and I. Benu1Fac. Anim. Husbandry, Marine and Fishery Sciences, Universitas Nusa Cendana, Indonesia*Corresponding author: igustingurahjelantik@staf.undana.ac.idAbstractA total of 23 feedstuffs commonly used for ruminant feeding in the province of Nusa Tenggara Timur were evaluated for their fibre composition and in vitro organic matter digestibility (IVOMD). Fibre components analyzed included crude fibre (CF), neutral detergent fibre (NDF), acid detergent fibre (ADF), acid detergent lignin (ADL), cellulose, and hemicellulose. Data were statistically compared among feed classes using analysis of variance, regression analyses were conducted to examine the relationship between fibre components and IVOMD. Results showed substantial variation in fibre content both among and within feed classes. Crude fibre content was significantly higher (P<0.05) in grasses and lowest in concentrate feeds. The NDF, ADF, and ADL contents were found to significantly influence IVOMD (P<0.05), whereas other fibre components did not show a significant effect. Among the fibre components, lignin (R%u00b2 = 0.520) and ADF (R%u00b2 = 0.401) were the best predictors of IVOMD. In conclusion, the fibre composition and digestibility of ruminant feedstuffs in Nusa Tenggara Timur vary widely across and within feed classes, with lignin and ADF content serving as the most reliable predictors of digestibility.Keywords: fibre composition, Organic matter digestibility, Acid detergent lignin, Nusa Tenggara Timur