Judul: Pendugaan kebutuhan energi metabolis dan protein ayam broiler berdasarkan hasil pemberian makanan cara kafetaria
Abstrak: Telah dilakukan penelitian di Fakultas Peternakan IPB Bogor, bertujuan menggali informasi seberapa jauh kemampuan ayam broiler dengan perilaku dan pengalamannya ikut menentukan menyusun ransum memenuhi kebutuhannya. Ransu yang disusun tidak saja berdasarkan kandungan nutriennya tetapi juga berdasarkan selera ayam diduga akan lebih efektif penggunaannya. Ransum yang disusun bagaimanapun baiknya akan gagal memenuhi fungsinya bila tidak dimakan atau di tolak. Ransum sempurna adalah ransum yang cukup mengandung nutrien dan disukai ayam. Berdasarkan hasil hipotesa yang didapatkan ,ditetapkan perlunya modifikasi penyusunan dan penyediaan ransum untuk meningkatkan keefektifan dan keefisienan penggunaan ransum sesuai kondisi lingkungan khas Indonesia.
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Judul: Nilai energi metabolis silase ransum komersil pada ayam broiler
Abstrak: Tujuan penelitian ini adalah untuk mengetahui nilai energi metabolis silase ransum komersil pada ayam broiler. Ternak yang digunakan adalah ayam broiler umur lima ininggu sebanyak 15 ekor dengan bobot badan rata-rata 1.463,13 ± 57,34 gram. Empat ekor ayam broiler diberi ransum komersil (RO), empat ekor ayam broiler diberi 50% silase ransum komersil dan 50% ransum komersil (R1), empat ekor ayam broiler diberi 100% silase ransum komersil (R2) dan sisanya tiga ekor ayam broiler dipuasakan untuk mengukur nilai energi endogenous. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan tiga perlakuan dan empat ulangan, dengan tiap ulangan terdiri atas satu ekor ayam broiler. Data yang diperoleh dianalisa menggunakan sidik ragam (ANOVA) dan jika memberikan hasil yang berbeda nyata dilanjutkan dengan uji kontras ortogonal. Perlakuan memberikan pengaruh yang tidak nyata terhadap energi metabolis (EMS, EMSn. EMM dan EMMn). Rataan nilai retensi nitrogen RO, RI dan R2 berturut-turut adalah 0,93; 0,92 dan 0,88 gram. Rataan kandungan EMSn RO, R1 dan R2 berturut-turut adalah 3.350,26; 3.191,96 dan 3.295,13 kkal/kg. Dapat disimpulkan bahwa pemberian silase ransum komersil sampai taraf 100% tidak berpengaruh negatif terhadap nilai energi metabolis. yang ditunjukkan dengan samanya nilai energi metabolis dengan kontrol. Silase ransum komersil ini menghasilkan nilai EMS, EMSn, EMM dan EMMn berturut-turut sebesar 3.577.80; 3 295,13; 4.176,56 dan 3.893,89 kkal/kg.
Keyword: silase, ransum komersil, energi metabolis, ayam broiler

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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