RESPONS KECERNAAN NUTRIEN DAN PERTUMBUHAN TIKUS (Rattus norvegicus) TERHADAP SIFAT FISIK SUMBER SERAT RANSUM [The Effect of Physical Characteristic of Dietary Fibres on Nutrient Digesibility and Body Weight Gain in Rattus norvegicus]

Abstract

ABSTRAK Penelitian ini bertujuan untuk mengevaluasi konsumsi dan kecernaan bahan kering, bahan organik dan lemak serta pertambahan bobot hidup tikus sebagai respons terhadap penambahan pakan sumber serat dalam ransumnya pada aras 1,3-1,5%. Dua puluh lima ekor tikus (Rattus Norvegicus) dengan rataan berat hidup 65,85 + 8,19 g, dikelompokan dalam rancangan acak kelompok dan diberi 5 jenis ransum berbeda sebagai perlakuan. Ransum mengandung bahan sumber serat sebagai berikut: ampas jahe (Jahe), ampas nenas (Nenas), ampas teh (Teh), ampas teh + onggok (Teh-O) dan ampas teh + kulit rajungan (teh- R). Tikus menunjukkan konsumsi bahan kering 9,49-11,72 g per hari dan bahan organik 8,92-11,10 g per hari. Kadar serat kasar ransum 3,92-4,12% memungkinkan pertumbuhan tikus 1.71 to 4.64 g per hari. Koefisien cerna bahan kering, bahan organik dan lemak tidak berbeda antar ransum dan berturut-turut berkisar sekitar 80,31-85,00%, 83,88-88,11% dan 67,51-93,70%. Kadar serat hingga 35% dari kadar serat total 4% tidak berpengaruh terhadap kecernaan bahan kering, bahan organic dan lemak. Namun serat kasar ransum diduga mempengaruhi penyerapan zat makanan dan penimbunannya dalam jaringan tubuh. Kata kunci: tikus, serat, nutrien, konsumsi, kecernaan, bobot badan ABSTRACT This experiment aimed to evaluate the intake and digestibility of dry matter, organic matter and fat, and weight gain in mouse as a response to the inclusion of different type of fibrous feed in their rations at level of 1.3-1.5%. Twenty five of mouse (Rattus norvegicus) with average body weight of 65.85 + 8.19 g were grouped, and were alloted in a randomized block design and were offered five rations as treatments. The rations contained different source of fibres : ginger pulp (Jahe), pineapple pulp (Nenas), tea pulp (Teh), tea pulp + cassava by-product (Teh-O), tea pulp + crabs shall (Teh-R). The mouse had dry matter intake of 9.49 -11.72 g per day; and organic matter intake 8.92-11.10 g per day. The dietary fibre content of 3.92-4.12% allowed growth rate of 1.71 to 4.64 g per day. The digestibility coefficient of dry matter, organic matter and fat were not different among rations and varied from 80.31 to 85.00%, from 83.88 to 88.11% and from 67.51 to 93.70%, respectively. The fibre level up to 35% of the 4% total fibre had no significant effect on digestibility of dry matter, organic matter and fat. However, the dietary fibre might alter the nutrient absorption and its deposisition in the body tissue. Keywords: mouse, fibre, nutrient, intake, digestibility, gain