Judul: Evaluasi beberapa ransum komersil terhadap persentase bobot karkas, lemak abdomen dan organ dalam ayam broiler
Abstrak: This research was carried out to study the effect of feeding 4 commercial chicken diets on carcass, abdominal fat and viscera of broilerc hicken. Fourty of broilers strain X from 200 Daya Old Chick which were kept in litter system during five weeks were observed in this experiment.This research used Completely Randomize Design consisted of 4 treatments and 5 replications.
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Judul: Produksi karkas dan penimbunan lemak abdominal ayam broiler hasil pemberian ransum komersial finisher, bungkil kedele, gaplek dan dedak halus secara terpisah
Abstrak: Penelitian ini dilaksanakan di Kandang Percobaan Ilmu Nutrisi dan Makanan Ternak Unggas, Jurusan Ilmu Nutrisi dan Makanan Ternak, Fakultas Peternakan, Institut Pertanian Bo- gor, deri tanggal 9 Maret sampai dengen 20 April 1988. Tu- juannya untuk mempelajari pengaruh pemberian ransum komer- sial finisher, bungkil kedele, gaplek dan dedak halus seca- ra terpisah terhadap bobot tubuh akhir, produksi karkas dan penimbunan lemak abdominal ayam broiler umur enam minggu. Duaratus ekor anak ayam umur sehari dari galur "Arbor Acres CP 707" yang digunakan dalam penelitian ini dipeliha- ra tanpa pembedaan jenis kelamin dalam boks kawat berukuran 1m x 1m x 0.43 m yang masing-masing berisi 10 ekor. Rancangan Percobaan yang digunakan adalah Rancangan A- cak Lengkap (RAL) dengan empat macam ransum perlakuan: R1 (ransum komersial), R2 (ransum komersial finisher, bungkil kedele, gaplek), R3 (ransum komersial finisher, bungkil ke- dele, dedak halus), R4 (ransum komersial finisher, bungkil kedele, gaplek, dedak halus) dengan masing-masing lima u- langan. Bobot tubuh akhir dianalisa dengan menggunakan si- dik ragam (Anova) dan uji jarak Duncan untuk membandingkan pengaruh antar perlakuan, sedangkan bobot dan persentase karkas dan lemak abdominal dianalisa dengan menggunakan si- dik peragam (Ancova). Hasil penelitian menunjukkan bahwa pengaruh macam ba- han penyusun ransum sangat nyata (P/0.01) pada bobot tubuh akhir, bobot dan persentase lemak abdominal, tetapi tidak nyata pada bobot karkas dan nyata (P/0.05) pada persentase karkas ayam broiler umur enam minggu. Rataan bobot tubuh akhir, bobot dan persentase karkas tertinggi dicapai oleh ayam-ayam yeng mendapat ransum kontrol (R1), sedangkan R4 menunjukkan hasil terendah. Rataan bobot dan persentase le mak abdominal berturut-turut dari yang terendah yaitu R3, R1, R2, R4. Secara keseluruhan penggunaan ransum komersial finish- er, bungkil kedele, gaplek dan atau dedak halus belum mampu memberikan keuntungan yang berarti bagi peternak dibanding- kan dengan ransum kontrol. Tetapi pada kondisi atau daerah...
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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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