Judul: Bungkil kacang tanah dalam ransum ayam broiler ditinjau dari kandungan
Abstrak: Tujuan penelitian ialah untuk menentukan cendawan dengan spesiesnya yang tumbuh pada bungkil kacang tanah yang menghasilkan aflatoksin dan persentase peoggunaan bungkil kacang tanah dalam ransum ditinjau dari segi aflatoksinnya serta pengaruhnya terhadap pertumbuhan ayam broiler. Penelitian ini terditi atas dua tahap yaitu penelitian pertama dan penelitian akhir.
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Judul: Pengaruh pemberian ransum dengan berbagai tingkat bungkil biji saga pohon ( Adenanthera pavonina, L. ) kukus terhadap performans ayam broiler
Abstrak: Penelitian ini berlangsung selama delapan minggu mu- lai tanggal 29 Oktober 1985 sampai dengan tanggal 24 De- sember 1985. Penelitian dilaksanakan di laboratorium Il- mu Nutrisi dan Makanan Ternak Unggas, Fakultas Peternak- an, Institut Pertanian. Bogor. Tujuan penelitian adalah mempelajari kemungkinan penggunaan bungkil biji saga pohon kukus dalam ransum ayam broiler dilihat dari konsumsi ransum, pertambahan bobot badan, konversi ransum, mortalitas dan "Income Over Feed and Chick Cost". Selain itu untuk mengetahui pula berapa persen. bungkil biji saga pohon kukus dapat diper- gunakan. dalam ransum tanpa memberikan pengaruh merugikan. Materi penelitian yang dipergunakan meliputi 160 ekor anak ayam umur sehari (AUS) tipe pedaging strain Ta- tum terdiri dari 80 ekor anak ayam jantan dan 80 ekor anak ayam betina, kandang pemeliharaan, peralatan kandang dan ransum penelitian terdiri dari 10 macam, 5 macam ran- sum "starter" dan 5 macam ransum "finisher", masing-ma- sing mengandung 0% (R), 5% (R2), 10% (R3), 15% (R) dan 20% (R) bungkil biji saga pohon kukus. Ransum di- susun isiprotein dan isokaloris dengan kandungan protein 23.2% untuk periode "starter" dan. 19.3% untuk periode "finisher" dengan energi metabolis kkal/kg ransum. masing-masing 3 100 Rancangan penelitian yang dipergunakan adalah Ran- cangan Acak Lengkap (RAL) dengan lima perlakuan dan empat ulangan.. Untuk mengetahui sampai sejauh mana pengaruh pemberian bungkil biji saga pohon kukus dalam ramsum ayam broiler dilihat dari performansnya, beda nyata dengan uji jarak Duncan, maka dilakukan uji Hasil analisa statistik menunjukkan, bahwa pemberian bungkil biji saga pohon kukus memberikan pengaruh sangat nyata (P0.01) terhadap konsumsi ransum, pertambahan bobot badan dan konversi ransum. Penggunaan bungkil biji saga pohon kukus dalam ran- sum ayam broiler ternyata hanya sampai dengan tingkat...
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Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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