Judul: Evaluasi Genetik Produksi Susu Sapi Fries Holland di PT Cijanggel-Lembang
Abstrak: Upaya perbaikan mutu genetik produksi susu sapi perah dapat ditempuh dengan melakukan seleksi pejantan dan induk, yang memerlukan informasi catatan individu ternak. Berdasarkan catatan produksi tersebut dapat dievaluasi kemampuan pewarisan sifat produksi terhadap keturunannya.
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Judul: Perbaikan Genetika Dalam Peningkatan Produksi Susu Ternak Sapi Perah Fries Holland
Abstrak: Tujuan dari penelitian ini adalah menseleksi mutu genetik ternak guna menentukan induk-induk sapi lokal yang berproduksi tinggi dan menentukan pejantan yang layak untuk dikembangkan. Data produksi susu yang digunakan adalah catatan produksi susu bulanan sapi-sapi perah Fries Holland (FH) di peternakan Poultry & Dairy Surya Farm, Sukabumi dari tahun 1983 sampai dengan tahun 1986. Cara seleksi yang digunakan adalah uji produksi susu yangterdiri dari uji produksi tiap individu dan uji turunan. Uji produksi tiap individu uji terhadap induk untuk melihat daya produksi susunya sebagai dasar untuk pemili- han bibit. Contoh yang digunakan adalah sebanyak 45 ekor sapi induk yang laktasi pada periode 1985/1986. Sedangkan uji turunan adalah untuk melihat kemampuan pejantan menurunkan sifat-sifat produksinya pada anak-anak nya. Dari lima ekor pejantan diperoleh 28 ekor anak (turunan)-nya dan dipakai sebagai contoh. Tiap anak dikelom- pokkan menurut pejantan (bapaknya) dan tiap anak pejantan dibagi menurut periode tanggal beranaknya. Periode selang waktu beranak terdiri dari Januari 1983- Desember 1984 dan Januari 1985 - Desember 1986 kemudian digunakan untuk uji DDC, EPI dan CC. Metode pengujian, DDC dan EPI digunakan pasangan produksi susu anak-induk, sedang metode CC adalah membandingkan produksi susu rata-rata dari anak pejantan yang diuji dengan produksi susu rata-rata anak pejantan lain. Hasil pengujian diperoleh, bahwa sapi-sapi induk yang produksi susunya diatas produksi rata-rata perusahaan sebanyak 57.70% dan selebihnya dibawah produksi rata-rata perusahaan (4421.60 liter/laktasi)…dst
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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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