Judul: Daily Feed Consumption Patterns of Brahman Cross One Month After Fettening with Additional Depolarization of Katuk
Abstrak: Katuk depolarisasi adalah pakan tambahan yang biasa digunakan untuk meningkatkan produksi susu pada sapi perah. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian ransum yang mengandung katuk depolarisasi terhadap konsumsi pakan dan performa pertumbuhan pejantan Brahman Cross satu bulan setelah penggemukan feedlot. Perlakuan pakan meliputi ransum GGL (pakan kontrol), GGL ransum + 100 gram bubuk katuk, GGL ransum + 100 gram pelet katuk. Peubah yang diamati adalah konsumsi pakan segar, konsumsi bahan kering, bobot badan, pertambahan bobot badan harian dan konversi pakan. Analisis data yang digunakan adalah analisis deskriptif dan analisis uji T. Penambahan katuk depolarisasi pada ransum GGL tidak mempengaruhi konsumsi pakan (segar dan bahan kering), pertambahan bobot badan harian dan konversi pakan pejantan Brahman Cross satu bulan setelah penggemukan. Hasil penelitian menunjukkan bahwa penambahan katuk depolarisasi terhadap pertambahan bobot badan harian, konsumsi pakan segar, konsumsi bahan kering , dan konversi pakan relatif sama., Depolarized katuk is a feed additive commonly used for increasing milk yield in dairy cow. This study aimed to determine the effect of feeding ration containing depolarized katuk on feed consumption and growth performance of Brahman Cross bull one month after feedlot fattening. The feed treatments included GGL ration (control feed), GGL ration + 100 gram katuk powder, GGL ration + 100 gram katuk pellet. The variables observed were the feed consumption as fed and dry matter, body weight, daily body weight gain and feed conversion. The data analysis used is descriptive analysis and t test analysis. The addition of depolarized katuk (Sauropus androgynus) on GGL ration did not affect the feed consumption (as fed and dry matter), daily body weight gain and feed conversion of Brahman Cross bull one month after fattening. The results showed that the addition of depolarized katuk on the performance of daily body weight gain, fresh feed consumption, dry matter consumption, and feed conversion were relatively the same.
Keyword: body weight gain, brahman cross, feed consumption, feed conversion, katuk depolarisasi

Judul: Profile of Raw Materials of Katuk Depolarization and Palatability of Katuk Feed Additive on Sheep and Cattle
Abstrak: Daun tanaman katuk (Sauropus androgynus (L.) Merr) sebagai obat atau imbuhan pakan (feed additive) dapat meningkatkan produksi ternak dan sekresi air susu baik pada manusia maupun hewan. Diketahui bahwa tanaman katuk memiliki bagian lain yang bisa dimanfaatkan dan diolah untuk dijadikan tepung pelet katuk, yaitu batang lunak. Bagian batang lunak secara proporsional dapat sebagai bahan baku pengganti daun dalam proses produksi pelet feed additive untuk ternak. Penelitian ini bertujuan untuk mengetahui pemanfaatan batang lunak sebagai bahan baku pellet katuk depolarisasi dan palatabilitas katuk terhadap domba dan sapi potong. Penelitian menggunakan 8 ekor domba dan 12 ekor sapi potong untuk uji palatabilitas dan menggunakan 18 kg tanaman katuk. Hasil penelitian menunjukkan bahwa panjang batang lunak yang dipanen pada periode pertama tidak berbeda nyata (p>0,05) dengan panen periode kedua, namun untuk bobot daun dan bobot panjang batang lunak berbeda nyata dengan panen periode kedua (p<0,05). Panen periode pertama menghasilkan bobot daun dan batang lunak lebih tinggi dari panen periode kedua. Hasil uji palatabilitas terhadap domba menunjukan baik pelet D maupun pelet DBL sama-sama disukai oleh domba. Uji palatabilitas pelet dan bubuk katuk terhadap sapi melihatkan perbedaan yang nyata (p<0,05), sapi lebih menyukai katuk dalam bentuk pelet dibanding bubuk., Katuk plant leaves (Sauropus androgynus (L.) Merr) as a drug or feed additive (feed additive) can increase livestock production and milk secretion in both humans and animals. It is known that the katuk plant has other parts that can be utilized and processed to make katuk pellet flour, namely the soft stem. The soft stem portion can be proportionately as raw material for leaf replacement in the process of producing feed additive pellets for livestock.This research aims toknowing the utilization of soft stems as raw material for depolarizing katuk pellets and the palatability of katuk for sheep and beef cattle.The study used 8 sheep, 12 cows for palatability testing and used 18 kg of katuk plants.The results showed that the length of soft stems harvested in the first period was not significantly different (p>0,05) from the second period, but leaf weight and soft stem length were significantly different from those of the second period (p<0,05). The first harvest period resulted in higher leaf and soft stem weights than the second period harvest. The results of the palatability test on sheep showed that both D pellets and DBL pellets were equally favored by sheep. The palatability test of pellets and katuk powder on cattle showed a significant difference (p<0,05), cattle preferred katuk in the form of pellets compared to powder.
Keyword: harvest period, katuk, palatability, pellets

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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