Judul: Pengaruh Substitusi Bungkil Kedelai dengan Tepung Maggot (Hermetia illucens) terhadap Konsumsi Zat Makanan dan Fermentabilitas Domba Garut Jantan
Abstrak: rendah. Protein diperlukan sebagai bahan penyusun beberapa hormon dan enzim untuk meningkatkan kualitas sperma. Penelitian ini bertujuan mengevaluasi penggunaan tepung maggot sebagai substitusi bungkil kedelai hingga 100% atau 20% penggunaannya dalam rasum terhadap konsumsi zat makanan dan fermentabilitas domba Garut pejantan. Rancangan acak lengkap dengan 3 perlakuan 4 ulangan (R1 : ransum mengandung bungkil kedelai 20%; R2 : ransum mengandung 10% bungkil kedelai dan 10% tepung maggot; R3: ransum mengandung 20% tepung maggot). Peubah yang diukur adalah konsumsi (rumput, konsentrat, bahan kering, zat makanan, dan TDN), total VFA, kadar amonia, pertambahan bobot badan harian, efisiensi penggunaan pakan, dan efisiensi penggunaan protein. Hasil penelitian menunjukkan bahwa penggunaan tepung maggot berpengaruh nyata terhadap konsumsi lemak tetapi tidak berpengaruh terhadap konsumsi rumput dan konsentrat, konsumsi zat makanan, TDN, total VFA, kadar amonia, PBBH, efisiensi penggunaan pakan dan efisiensi penggunaan protein. Dapat disimpulkan tepung maggot dapat menggantikan 100% tepung bungkil kedelai atau digunakan 20% dalam ransum domba Garut jantan.
Keyword: fermentability, maggot meal, soybean

Judul: Substitution of Soybean Meal with Maggot as a Source of Ruminant Protein on In Vitro Digestibility and Fermentability
Abstrak: Penelitian ini bertujuan mengevaluasi pengaruh perbedaan media hidup terhadap kandungan nutrien maggot Black Soldier Fly (BSF) dan mengevaluasi penggunaan tepung maggot sebagai sumber protein substitusi bungkil kedelai pada ransum ternak ruminansia terhadap fermentabilitas dan kecernaan ransum yang diuji secara in vitro. Budidaya maggot menggunakan media feses, media limbah rumah tangga, dan media roti. Kandungan protein yang tinggi pada maggot, yang digunakan untuk substitusi bungkil kedelai. Perlakuan pada penelitian yaitu P1= Sumber Protein Bungkil Kedelai + Bungkil Kelapa, P2= Substitusi 50% Protein Bungkil Kedelai, P3= Substitusi 100% Protein Bungkil Kedelai. Hasil penelitian menunjukkan bahwa perlakuan tidak berpengaruh nyata (P>0,05) terhadap pH, KcBK, KcBO, dan VFA, namun berpengaruh nyata (P<0,05) terhadap NH3. Maggot pada media feses menghasilkan nilai kandungan protein yang paling tinggi. Berdasarkan nilai fermentabilitas, tepung maggot dihasilkan dari media feses dapat menggantikan sumber protein bungkil kedelai tanpa memberikan hasil yang negatif terhadap fermentabilitas dan kecernaan rumen secara in vitro., This research is aimed to evaluate the effect of different live media on the nutritional content of maggot Black Soldier Fly (BSF) and evaluate the use of maggot flour as a protein source to replace soy bean meal in cattle rations ruminants towards fermentability and digestibility of rations that are tested by in vitro. Maggot cultivation uses feces media, household waste media, and bread media. High protein content in maggot, which is used as a substitute for soybean meal. The treatment in this research is P1 = Soy Bean Meal Protein Source + Cocos nucifera, P2 = Substitution of 50% Soy Bean Meal Protein Source, P3 = Substitution of 100% Soy Bean Meal Protein Source. The results showed that the treatment had no significant effect (P>0.05) on pH, KcBK, KcBO, and VFA, but had a significant effect (P<0.05) on NH3. Maggot in feces media produced the highest protein content value. The administration of maggot flour based on its fermentability value, maggot flour produced from feces substrate can replace soybean meal protein sources without give negative on towards fermentability and digestibility of the ration by in vitro.
Keyword: Black soldier fly, , digestibility, fermentabilty, in vitro

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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