Judul: Kualitas Karkas Kambing Kacang dan Domba Garut yang Digemukkan Menggllnakan Pakan Mengandung Konsentrat Bulir Sorgum
Abstrak: Sorghum is one of cereal plant that has big potency as feed for sheep and goat. The objective of the research was to evaluate carcass quaiity of kacang goat and gamt sheep fed with concentrate contain sorghum grain. Total twelve kacang goat and gamt sheep were used for the research. Data of carcass quality were collected and analyzed by Analysis of COvariance (ANCOVA) with initial body weight, slaughter weight and half carcass from left side weight were used as co variable. Result shows that kacang goat had lower average daily gain (ADG) than gamt sheep (P<0.05). Carcass percentage of kacang goat with average slaughter weight 17.17 kg was 38.65% with percentage of lean, fat bone from carcass were 62.44%, 10,56% and 27% respectively. Whcreas carcass percentage of garut sheep with average slaughter weight 23 .70 kg was 40.55% with percentage of lean, fat bone from carcass were 60.48%, 16.71 % and 22.81 % respectively. In addition, the data for commercial carcass cuts showed that percentage of leg cut from kacang goat was significantly lower than garut sheep (P<O.OI), whereas muscle (lean) percentage of leg and shank cuts from kacang goat was significantly higher than garut sheep (P<O.OI). In contrast, rack cuts from kacang goat was significantly lower than garut sheep (P<O,OI). Bone percentage of shoulder, rack, loin and breast cuts were very significantly higher for kacang goat than garut sheep (P<O.OI).
Keyword: Bogor Agricultural University (IPB), Carcass, Concentrate contain shorgum grain, garut sheep

Judul: Kualitas Fisik, Kimia Dan Histologi Daging Kambing Kacang Dan Domba Garut Yang Diberikan Pakan Berbasis Sorgum.
Abstrak: Sorgum (Sorghum bicolor L.) merupakan salah satu jenis tanaman serealia yang mempunyai potensi besar untuk dikembangkan di Indonesia karena mempunyai kemampuan adaptasi yang tinggi. Biji sorgum potensial digunakan sebagai pakan konsentrat karena termasuk dalam bahan sumber karbohidrat (73g/100g) dengan kandungan energi metabolisnya mencapai 3212 kkal kg-1(NRC 1994). Sorgum juga mempunyai kandungan protein yang tinggi (12.99%) dan lemak yang rendah (2.34%) dibandingkan jagung dengan kandungan protein (8.7%) dan karbohidrat (72.4 g/100g). Biji sorgum potensial digunakan sebagai pakan konsentrat, namun terdapat faktor yang menjadi pertimbangan dalam penggunaan sorgum yaitu kandungan tannin sehingga penelitian ini perlu dilakukan untuk mengevaluasi nilai mutu daging baik secara fisik maupun kimia, serta profil otot daging kambing dan domba lokal yang diberikan pakan berbasis sorgum yang dipelihara secara intensif. Enam ekor kambing Kacang dan enam ekor domba Garut umur kurang dari satu tahun dipelihara secara intensif selama 100 hari. Pakan yang diberikan adalah konsentrat berbasis sorgum (20% bulir sorgum). Daging bagian Longissimus dorsii di analisis berdasarkan kualitas fisik, kimia dan histologi ototnya. Analisa kualitas fisik meliputi uji warna, keempukan, daya mengikat air dan susut masak. Analisa kualitas daging secara kimia meliputi uji kadar protein, kadar lemak, kadar kolesterol, kadar karbohidrat, kadar air dan abu. Profil histologi daging dianalisis dengan menggunakan pewarnaan Haematoxylin-Eosin (HE) standar (Kiernan, 1990) dan pewarnaan jaringan ikat dengan Masson Trichrome (Kiernan, 1990). Parameter yang diamati adalah luas penampang otot, luas fasikulus, jumlah otot per fasikulus, persentase area otot per fasikulus, persentase jaringan ikat perfasikulus, jarak antar fasikulus dan persentase jaringan ikat dalam jarak fasikulus. Berdasarkan hasil diperoleh rataan kualitas fisik daging meliputi nilai pH daging, pH daging kambing (6.03±0.10) dan pH daging domba (5.79±0.08). Daging kambing dan domba keduanya tergolong daging sangat empuk, dimana keempukan daging kambing (2.73±0.33 kg cm-2) dan daging domba (1.86 ±0.23 kg cm-2). Lemak pada daging kambing lebih rendah (2.00 ±0.56) dari daging domba (4.78 ±1.77). Profil otot daging dapat menggambarkan kualitas daging. Daging domba memiliki luas fasikulus yang lebih besar, jumlah otot per fasikulus lebih sedikit dan jarak antar fasikulus lebih panjang, sehingga secara mikroskopis kualitas daging domba lebih baik dari daging kambing. Pakan berbasis sorgum menghasilkan kualitas daging yang baik, yang ditunjukkan kualitas fisik, kimia dan profil histologi daging yang berada pada kisaran normal.
Keyword: sorgum, kualitas daging, histologi daging

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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