Judul: Pengaruh perbedaan kandungan serat kasar ransum terhadap penampilan produksi kelinci persilangan jantan
Abstrak: Dalam usaha meningkatkan penyediaan daging untuk meningkatkan gizi masyarakat, kelinci merupakan jenis ternak yang cukup potensial untuk dikembangkan. Kelinci dapat berkembangbiak dan mampu menggunakan lebih banyak proporsi hijauan dalam ransumnya. Kandungan serat kasar akan menentukan keefisienan penggunaan ransum. Semakin tinggi kandungan serat kasar, koefisien cerna dan keefisienan ransum semakin rendah. Bagi kelinci, serat kasar mempunyai nilai gizi yang rendah, tetapi dalam jumlah tertentu tetap dibutuhkan di dalam ransumnya. Hal ini mengingat fungsi serat kasar sebagai "bulk", sumber energi dan zat laksan.
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Judul: Pengaruh kastrasi dan kadar protein ransum terhadap saluran pecernaan, hati, pankreas dan produksi karkas komersial kelinci persilangan
Abstrak: Penelitian ini dilakukan di laboratorium Ternak Daging dan Kerja, Jurusan Ilmu Nutrisi dan Makanan Ternak, Fakultas Peternakan, Institut Pertanian Bogor, mulai tanggal 7 Juli sampai 22 September 1991. Tujuan dari penelitian ini adalah untuk mempelajari pengaruh kastrasi dan penggunaan ransum dengan kadar protein yang berbeda terhadap penampilan, karkas dan komponen karkas kelinci persilangan. Kelinci yang digunakan dalam penelitian ini adalah persilangan antara bangsa California dan New Zealand White, dengan bobot rata-rata 1026 ± 32.72 g sebanyak 24 ekor. Kelinci tersebut adalah kelinci lepas sapih dengan umur sekitar 2 bulan. Penelitian dilaksanakan dalam rancangan acak lengkap pola faktorial 2x3. Kelinci kas- trat (K1) dan Jantan (K2) sebagai faktor pertama, sedang- kan ransum dengan kadar protein 8.02% (R1), 13.94% (R2) dan 18.22% sebagai faktor yang kedua. Masing-masing perla- kuan dilakukan empat kali ulangan. Hasil Penelitian menunjukkan bahwa kadar protein ransum berpengaruh sangat nyata (P<0.01) terhadap konsum- si, pertambahan bobot badan, konversi ransum, bobot tubuh kosong, bobot karkas serta berpengaruh nyata (P<0.05) terhadap bobot otot total. Ransum dengan kadar protein 8.02% memberikan hasil yang sangat nyata (P<0.01) lebih rendah dari R2 dan R3. Kastrasi berpengaruh nyata (P<0.05) terhadap bobot lemak pinggang dan bobot lemak total, sedangkan pada peubah yang lain pengaruhnya tidak nyata. Interaksi antar perlakuan tidak memberikan hasil yang nyata terhadap semua peubah yang diamati....
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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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