Judul: Pengaruh Sistem Perkawinan Asortatif terhadap Karkas Puyuh Betina Umur 8 Minggu
Abstrak: Penelitian i n i dilakukan d i Laboratorium Pemuliaan Unggas, Bagian Ilmu Produksi Ternak Unggas, Fakultas Peternakan, I n s t i t u t Pertanian Bogor. Mmulai tanggal 30 November 1983 sampai tanggal 10 Maret 1984. Tujuan penelitian ini adalah untuk mengetahui pengaruh sistem perkawinan asortatif terhadap karkas puyuh bet ina umur 8 rninggu.
Keyword: 

Judul: Pengaruh sistem perkawinan asortatif terhadap bobot telur, fertilitas, daya teras dan bobot tetas anak puyuh
Abstrak: Penelitian ini dilakukan di Laboratorium Pemuliaan dan Genetika ternak Fakultas Peternakan, Institut Pertani- an Bogor, yang berlangsung dari tanggal 14 November 1983 sampai dengan tanggal 22 Januari 1984. Tujuan penelitian ini adalah untuk mendapatkan infor- masi kriteria seleksi pada puyuh yang tepat dan terarah dengan cara mengetahui pengaruh sistem perkawinan asorta- tif yang berdasarkan sifat fenotipik jenis warna bulu ter- hadap bobot telur, fertilitas, daya tetas dan bobot tetas anak puyuh. Sebagai materi digunakan puyuh tetua sebanyak 80 ekor yang terdiri dari 32 ekor puyuh betina berbulu coklat, 32 ekor puyuh betina berbulu coklat hitam, 8 ekor puyuh jan- tan berbulu coklat dan 8 ekor puyuh jantan berbulu coklat hitam. Kandang yang digunakan adalah kandang yang berben- tuk "individual cage sistem baterei, dengan ukuran 16x26 x16 cm. Kandang berdinding dan berlantai kawat 1x1 cm yang dilengkapi dengan tempat makan dan minum. Kedalam satu kandang diisi dengan satu ekor puyuh betina dan puyuh jantan dirotasikan 1 x 24 jam secara bergilir untuk menga- wini puyuh-puyuh betina. Puyuh-puyuh disebarkan kedalam setiap kandang sesuai dengan perlakuan yang masing-masing perlakuan terdiri dari empat ulangan. Rancangan yang digunakan untuk mengetahui hubungan jenis kelamin dan warna bulu terhadap bobot badan puyuh tetua Rancangan Acak Lengkap Percobaan Faktorial 2x 2. Untuk mengamati pengaruh empat macam sistem perkawinan dan empat periode penetasan terhadap bobot telur, fertilitas, daya tetas dan bobot tetas anak puyuh, digunakan Rancangan Acak Lengkap Percobaan Faktorial 4 x 4. Analisis statis- tik yang digunakan Analisis Sidik Ragam, sedangkan uji lanjutan terhadap bobot telur, fertilitas, daya tetas dan bobot tetas anak puyuh adalah Uji Beda Nyata Jujur. Hasil pengamatan menunjukkan bahwa bobot badan puyuh tetua betina sangat nyata (PL kan dengan puyuh tetua jantan. 0.01) lebih berat dibanding....
Keyword: 

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.
Keyword: