Judul: Performa Domba yang diberi Rumput Brachiaria humidicola dan Legum Pohon (Leucaena leucocephala dan Gliricidia sepium) dengan Rasio yang Berbeda
Abstrak: This experiment was done to examine the addition effect of Gliricidia sepium and Leucaena leucocephala leaves mixed with Brachiaria humidicola on performance of sheep at UP3J. Twenty male sheep with initial body weight 13.95±1.46 kg were used in this experiment. The experiment used completely randomized block design with 5 treatments and 4 replications. The treatments were R1 (90% Brachiaria humidicola + 10% concentrate), R2 (80% Brachiaria humidicola + 10% legume + 10% concentrate ), R3 (70% Brachiaria humidicola + 20% legume + 10% concentrate), R4 (60% Brachiaria humidicola + 30% legume + 10% concentrate), and R5 (70% Brachiaria humidicola + 30% legume). Parameters observed in this experiment included feed consumption, daily body weight gain, feed efficiency, and Income Over Feed Cost (IOFC). Results showed that treatments improved protein consumption, but did not give significant effect on performance of sheep in UP3J. It is concluded that giving leaf of Brachiaria humidicola and legume (Gliricidia sepium and Leucaena luecocephala) at any level did not give any significant effect on sheep consumption, daily body weight gain, feed efficiency, and income over feed cost.
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Judul: Pemanfaatan Energi Pada Domba Di Up3 Jonggol Yang Mendapat Rasio Rumput Brachiaria Humidicola dan Legum Pohon (Leucaena Leucocephala dan Gliricidia Sepium) Yang Berbeda
Abstrak: This experiment was aimed to evaluate energy utilization of legume (Gliricidia sepium and Leucaena Leucocephala) mixed with concentrate and grass (Brachiaria humidicola) in male local sheep at UP3 Jonggol. This experiment was conducted according to completely randomized block design with five treatments and four replications which body weight as a block. The treatments were : R1 (90% Brachiaria humidicola + 10% concentrate), R2 (80% Brachiaria humidicola + 10% legume + 10% concentrate ), R3 (70% Brachiaria humidicola + 20% legume + 10% concentrate), R4 (60% Brachiaria humidicola + 30% legume + 10% concentrate), and R5 (70% Brachiaria humdicola + 30% legume). Rasio Gliricidia sepium and Leucaena Leucocephala in legume was 75% : 25%. Variables measured were dry matter and nutrient intake (crude protein, fat and fiber) and also energy utilization (intake, digestibility and metabolizable energy). Data were analyzed using analysis of variance and mean of treatment were further analyzed using Duncan test. The experiment showed that treatments affected (P<0.05) to the crude protein consumption. However, there were no effect of energy utilization in all treatments. It is concluded that the addition of 30% legume could increase crude protein intake but not for energy budget.
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Judul: Analisis Kestabilan Model Virus Komputer dengan Infeksi Tunda dan Pemulihan Tunda.
Abstrak: In this paper, a dynamical model is composed of computer virus model that considers time delay of infection and recovery processes. Stability analysis is performed to both models, i.e. the models with and without time delay. The model without time delay has two fixed points, which one of them is stable and the other is unstable. On the other hand, the model with time delay has fixed points which one of them is spiral stable. If the value of time delay is sufficiently large, then it will imply the stability changes from spiral stable to spiral unstable and subsequently the appearance of limit-cycle and Hopf bifurcation.
Keyword: computer virus model, Hopf bifurcation, time delay