Judul: Studi Penggunaan Cassabio dalam Ransum terhadap Penampilan Ayam Pedaging dan Kandungan Amonia (NH3) dalam Ekskreta
Abstrak: Peternakan ayam pedaging telah berkembang menjadi salah satu usaha nasional yang penting di bidang usaha perunggasan di Indonesia, dimana perkembangan usaha ini memberikan kontribusi nyata dalam pembangunan pertanian. Industri perunggasan memiliki nilai strategis khususnya dalam penyediaan protein hewani untuk memenuhi kebutuhan dalam negeri dan peluang ekspor. Saat ini ayam pedaging memberikan kontribusi 60.73% pemenuhan protein hewani nasional, kemudian disusul daging sapi sebesar 23.39% (Balitbang 2006)
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Judul: Performa Ayam Broiler yang Diberi Ransum dengan Penambahan Cassabio
Abstrak: Ayam broiler merupakan salah satu jenis hewan ternak yang umum dibudidayakan di Indonesia. Ayam broiler memiliki sifat genetik yang semakin baik di setiap generasi, salah satunya dapat dilihat dari semakin pendeknya umur panen. Perbaikan genetik harus diikuti dengan pemberian ransum yang lebih efisien dan ekonomis. Onggok Sebagai salah satu pakan alternatif berasal dari limbah pengolahan tepung tapioka yang ketersediaannya melimpah, namun nilai nutrisinya rendah. Fermentasi dengan Aspergillus niger sebagai inokulum dan urea, zeolit, serta ammonium sulfat sebagai sumber sulfur diharapkan dapat meningktkan kualitas onggok fermentasi (cassabio). Tujuan penelitian ini adalah untuk mengetahui performa ayam broiler yang diberi ransum dengan penambahan berbagai level cassabio. Ayam yang digunakan pada penelitian ini adalah ayam broiler strain Ross berumur satu hari sebanyak 240 ekor yang diproduksi oleh PT Cibadak Indah Sari Farm. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 5 taraf perlakuan dan 4 ulangan. Perlakuan terdiri atas C0 (ransum kontrol), C10 (ransum mengandung 10% cassabio), C20 (ransum mengandung 20% cassabio), C30 (ransum mengandung 30% cassabio), C40 (ransum mengandung 40% cassabio), dan RKm (Ransum komersial sebagai pembanding). Peubah yang diamati adalah konsumsi air minum, konsumsi ransum, pertambahan bobot badan, konversi ransum, persentase karkas, dan mortalitas. Data dianalisis menggunakan analisis sidik ragam (ANOVA) dan bila berbeda nyata dilanjutkan dengan Uji Lanjut Duncan (Gaspersz, 1991). Data performa yang terbaik dari perlakuan (C0, C10, C20, C30, dan C40) selanjutnya dibandingkan dengan Ransum Komersial (RKm).
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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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