Judul: Performa ayam broiler dengan pakan silase ransum komersil
Abstrak: The experiment was conducted to evaluate the effect of silage of commercial diet on feed consumption, feed conversion, body weight gain and frnal body weight of broiler. The experiment was conducted in Completely Randomized Design using 120 day old chicks (DOC) Cobb 500 strain. The animals were divided into 15 group and assigned randomly to one of three dietary treatments, namely: RO (commercial diet as control), R1 (50% silage of commercial diet + 500/0 control ration) and R2 (1W/o silage of commercial diet). The results showed that dietary treabnents significantly (PQ),Ol) influenced feed consumption and feed conversion, but the treatments did not significantly influence body weight gain and final body weight Feed consumption and feed conversion of broiler fed 50% silage was significantly higher compared with that of control. Feed consumption of broiler fed 1 W? silage was significantly lower compared with that of control, but the diet compared with control produced similar feed conversion. It was concluded that silage could be used up to 108% for broiler ration without negative effect on broiler's performance. Keywords : silage commercial diet, performance, broiler
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Judul: Performa ayam broiler dengan pakan silase ransum komersil
Abstrak: Penelitian ini bertujuan untuk mengetahui efektifitas dan taraf penggunaan silase ransum terhadap performa ayam broiler. Ternak yang digunakan, DOC (Day Old Chick) sebanyak 120 ekor yang dipelihara selama 5 minggu. Penelitian ini dilaksanakan dari bulan September sampai Oktober 2005. Ransum penelitian mengandung protein kasar sebesar 23,21% dan kandungan gross energy sebesar 4.284 kkal/kg. Perlakuan dalam penelitian ini adalah ransum komersil sebagai kontrol (R0), ransum campuran dengan rasio 50% ransum komersil: 50% ransum komersil yang dibuat silase (R1), ransum komersil yang dibuat silase (100% silase) (R2). Ransum dan air minum diberikan ad libitum. Rancangan percobaan yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap dengan 3 perlakuan dan 5 ulangan. Setiap ulangan terdiri dari 8 ekor ayam. Data yang diperoleh dianalisis dengan ANOVA (Analysis of Variance), dan jika berbeda nyata dilanjutkan dengan uji kontras orthogonal. Peubah yang diamati meliputi konsumsi ransum, pertambahan bobot badan, bobot badan akhir, konversi ransum dan mortalitas. Hasil penelitian menunjukkan bahwa pemberian silase ransum sangat nyata (P<0,01) mempengaruhi konsumsi ransum. Rataan konsumsi ransum selama perlakuan adalah 1.897 sampai 2.168 g/ekor, Konsumsi perlakuan R1 sangat nyata (P<0,01) lebih tinggi dibandingkan dengan kontrol dan konsumsi perlakuan R2 sangat nyata (P<0,01) lebih rendah daripada kontrol, tetapi perlakuan tidak nyata mempengaruhi pertambahan bobot badan dan bobot badan akhir. Perlakuan R2 mempunyai nilai konversi ransum yang tidak nyata dibandingkan kontrol, tetapi perlakuan R1 mempunyai nilai konversi ransum yang sangat nyata (P<0,01) lebih tinggi dibandingkan dengan kontrol. Mortalitas selama penelitian sebanyak 1 ekor. Hasil penelitian menunjukkan bahwa pemberian silase ransum tidak berpengaruh negatif terhadap performa ayam broiler.
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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