Judul: Aktivitas Makan dan Status Gizi Lutung Perak (Trachypithecus cristatus) di Pusat Primata Schmutzer, Taman Margasatwa Ragunan, Jakarta
Abstrak: Silvered leaf monkeys (Trachypithecus cristatus) are primate that live in groups on trees and consume leaves. The feeding activities of silvered leaf monkey relates to the fulfillment of their dialy energy. The energy is needed for the continuity of the group existence. The feeding activities of silvered leaf monkeys have several activities. They are observing, taking, sorting, processing, biting, chewing, ingesting, pulling out their mouth, and disposing the feed. The study aimed to identify the feeding activities, kind and composition of feed, nutrient consumption and energy of silvered leaf monkeys (Trachypithecus cristatus) in Schmutzer Primate Center (PPS), Ragunan Zoo, Jakarta. Data is collected from June to September 2011 with total of 480 hours observations. The data collection for the feeding activities was performed using ad libitum and focal animal sampling methods. Based on the observations, there were three types of activities with the highest frequency. Such as resting, locomotion, and feeding activity at 44.87%, 40.89%, and 38.70%. Respectively the chewing feed activities on infants were the higest of the feeding activities (36.90%). Silvered leaf monkeys in Schmutzer Primate Center (PPS) have good palatability in type of lamtoro leaves (Leucaena glauca). The result of the study revealed that adult and infants monkeys have sufficient dry matter and protein consumption (40,5 g/BW/d, 8 g/BW/d and 63 g/BW/d, 12,5 g/BW/d), but less for fat and energy (2,37 g/BW/d, 23,87 kcal/BW/d and 3,75 g/BW/d, 37 kcal/BW/d), while nutrient recommendation
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Judul: Pendugaan Kebutuhan  Nutrien dan Kecernaan Pakan pada Lutung Kelabu (Trachypithecus cristatus Raffles 1812) di Pusat Penyelamatan Satwa Gadog-Ciawi Bogor
Abstrak: This experiment was aimed at studying nutrient requirement and digestibility of grey leaf monkey (Trachypithecus cristatus Raffles 1812) in Gadog Wildlife rescue Centre Ciawi, Bogor. This experiment used four female grey leaf monkeys to measure their feed consumption and digestibility. Feeds that were given were pohpohan, spinach, a fruit tree leaf (melinjo), green Chinese cabbage, kangkung and boiled sweet potato. Feed were given twice a day at 08.00 and 14.00. The variables measured in this study were temperature and relative humidity, feed consumption, nutrient digestibility, total digestible nutrient (TDN) and digestible nutrient (DE). The results of this study show that the most palatable feed for all grey leaf monkey is sweet patato and pohpohan. Feed that were consumed from the highest to the lowest amount are boiled sweet potato, pohpohan, green Chinese cabbage, kangkung, spinach, a fruit tree leaf (melinjo). The average for fresh intake were 624.6 ± 19.85 g/head/day. The average for nutrient consumption are 19.05 ± 1.23 ash/head/day, 23.03 ± 0.64 crude protein head/day, 13.20 ± 0.18 crude fiber/head/day, 2.36 ± 0.64 ether extract/head/day, 44.09 ± 1.71 N-free extract/head/day and 73.94 % Total Digestible Nutrient. Digestibility coefficient of grey leaf monkey 12.77 ± 0.61% are crude protein, 6.85 ± 0.45% crude fiber, 0.90 ± 0.15% ether extract, 27.85 ± 2.64% N-freextractives and DE 3.31 ± 0.23 Mcal DE/kg DM.
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Judul: Penggunaan Metode Homotopi untuk Menyelesaikan Persamaan KdV (Korteweg-de Vries)
Abstrak: Natural phenomena can be explained using nonlinear mathematical models. In this paper, we studied the solution of KdV equation using the Homotopy method. The KdV equation is used for describing both surface and internal waves. One of the solutions is called a solitary wave. The use of homotopy method to solve the KdV equation required a nonlinear operator which was determined by the nonlinear form of the KdV equation itself. Based on this operator, a recursive formula was obtained to get a sequence of the KdV solution. The higher the sequence order of the sequence used, the closer to the exact solution of the KdV equation.
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