Judul: Deteksi Status Mineral Pada Ayam Petelur Melalui Pengamatan Kandungan Mineral Telur Dan Biokimia Pada Darah
Abstrak: Serangkaian penelitian telah dilakukan di Fakultas Peternakan Institut Pertanian Bogor, untuk mempelajari metode pendugaan status mineral pada ayam petelur melalui pengamatan penampilan produksi, kandungan mineral telur dan pengamatan biokimia pada darah. Percobaan dilakukan dengan menggunakan Rancangan Acak Lengkap (RAL) terdiri dari empat perlakuan dan tiga ulangan. Tiga macam ransum defisien mineral masing-masing mengandung 25, 50 dan 75 persen dedak padi dan satu macam kepada tujuan ransum komersial sebagai kontrol telah diberikan 168 ekor ayam petelur selama dua bulan, untuk mempelajari pengaruh defisiensi terhadap penampilan produksi, kandungan mineral dengan mineral (Ca, P, Mg, Fe, Cu, Mn, dan Zn) pada kulit telur, kuning telur, serum dan tulang serta aktivitas enzim alkalin fosfatase Percobaan dilanjutkan dengan suplementasi multi mineral selama empat bulan, dengan tujuan untuk mengetahui kemampuan ayam petelur dalam memperbaiki penampilan prouksinya. Hasil yang diperoleh dalam penelitian ini menunjuk- bahwa defisiensi mineral secara nyata dapat menye- kan babkan terjadinya penurunan rataan konsumsi ransum, pro- duksi telur dan bobot telur pada bulan pertama terjadinya defisiensi. Suplementasi mineral dapat meningkatkan kembali rataan konsumsi ransum, produksi telur dan bobot telur, namun proses pemulihan ini memerlukan waktu yang cukup lama,….dst
Keyword: Mineral Status, Laying hens, Egg Mineral Content, Blood Biochemistry

Judul: Mempelajari Pengaruh Ransum Yang Kekurangan Ca, P, Beberapa Mineral Dan Vitamin Lain Terhadap Penampilan Dan Gambaran Darah Ayam Percobaan
Abstrak: Kalsium dan fosfor berperan dalam memelihara struktur kerangka serta aktifator beberapa enzim. Kekurangan mineral ini menyebabkan rakhitis pada hewan muda dan osteomalasia pada hewan dewasa (Girindra, 1988). Vitamin yang berperan dalam metabolisme kalsium dan fosfor pada unggas adalah vitamin D3. Vitamin ini di dalam hati diubah menjadi metabolit 25 - dihidroksikalsiferol dan selanjutnya diubah diginjal menjadi 1,25 - dihidroksikole-kalsiferol. Metabolit terakhir ini berperan dalam metabolisme kalsium dan fosfor (Ganong, 1980). Tujuan dari penelitian ini untuk melihat pengaruh ransum yang kekurangan kalsium, fosfor, beberapa mineral dan vitamin lain pada proses fisiologis serta akibatnya pada penampilan ayam percobaan. Pengaruh dari perlakuan dilihat dari pertambahan bobot badan, konsumsi dan efisiensi ransum serta gambaran total protein, albumin, globulin, kalsium, fosfor, hemoglobin, kholesterol darah dan hematokrit pada akhir penelitian. ...
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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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