Judul: Performa Domba Lokal dengan Pemberian Pakan Konsentrat Komersial dan Sorinfer pada Taraf yang Berbeda
Abstrak: Performa domba dipengaruhi oleh beberapa aspek seperti manajemen pakan. Penelitian bertujuan mengkaji performa domba lokal dengan pemberian pakan kombinasi sorinfer terhadap performa produksi domba lokal. Domba yang digunakan adalah domba betina lokal betina yang berumur 1-2 tahun (I0- I1) sebanyak 15 ekor dengan rataan bobot awal 19,38±3,11 kg. Penelitian menggunakan 3 perlakuan ransum yaitu konsentrat yang dikombinasikan dengan silase sorinfer dengan rasio P1 75:25, P2 50:50, P3 25:75. Peubah yang diamati adalah konsumsi ransum as feed, bahan kering (BK), protein kasar (PK), energi (TDN), konversi ransum as feed, BK, pertambahan bobot badan (PBB), bobot akhir, serta feed cost per gain (FCG). Data dianalisis kovarian (ANCOVA) menggunakan Statistical Product and Service Solution (SPSS) yang diuji lanjut dengan metode Duncan. Hasil penelitian menunjukkan konsumsi ransum as feed, BK, PK pada perlakuan P1 nyata lebih tinggi (P<0,05) dibandingkan dengan perlakuan lainnya. Nilai TDN, konversi as feed, konversi BK, PBB, dan FCG ketiga perlakuan tidak berbeda nyata (P>0,05). Perlakuan P1 menghasilkan performa domba terbaik berdasarkan konsumsi as feed, konsumsi BK, dan konsumsi PK.
Keyword: Domba Lokal, Konsentrat, Performa, Sorinfer

Judul: Performance and Behavior of Local Sheep with Concentrate and Sorinfer Feed Combination in Intensive Rearing
Abstrak: Domba lokal merupakan hasil persilangan dari luar yang telah dikembangbiakkan dan beradaptasi dengan lingkungan di Indonesia. Tujuan dari penelitian ini untuk mengkaji pengaruh pemberian pakan kombinasi sorinfer terhadap performa dan tingkah laku domba lokal UP3J. Penelitian ini menggunakan 25 ekor domba yang dibagi menjadi 5 perlakuan ransum yaitu konsentrat, sorinfer dan rumput odot. Data dianalisis menggunakan (ANOVA), bila terdapat perbedaan nyata, maka diuji lanjut uji Duncan. Hasil penelitian menunjukkan bahwa konsumsi as feed, PBBH, dan bobot akhir perlakuan P5 nyata berbeda (P<0,05) dibandingkan lainnya, sedangkan konsumsi BK P2 berbeda nyata (P<0,05). Konversi as feed dan konversi BK untuk kelima perlakuan sama. Frekuensi ingestive pada perlakuan P5 berbeda nyata (P<0,05) dibandingkan lainnya. Selanjutnya tingkah laku, minum, vokalisasi, dan locomotive pada domba dengan perlakuam P4, dan P2 berbeda nyata (P<0,05) dibandingkan lainnya. Frekuensi resting dari kelima perlakuan menunjukan hasil sama. Performa domba lokal dengan pemberian pakan 100% sorinfer mempunyai performa lebih baik dibandingkan lainnya. Domba lokal dengan pemberian 100% sorinfer mempunyai frekuensi tingkah laku ingestive yang lebih tinggi., Local sheep are the result of crosses from outside that have been bred and adapted to the environment in Indonesia. The purpose of this study was to examine the effect of sorinfer combination feeding on the performance and behavior of UP3J local sheep. This study used 25 sheep which were divided into 5 ration treatments, namely concentrate, sorinfer, and odot grass. Data were analyzed using (ANOVA), if there is a significant difference, then it is further tested by Duncan's test. The results showed that the consumption of as feed, PBBH, and the final weight of the P5 treatment was significantly different (P<0.05) compared to the others, while the consumption of BK P2 was significantly different (P<0.05). The as feed conversion and BK conversion for the five treatments were the same. Ingestive frequency in the P5 treatment was significantly different (P<0.05) compared to the others. Furthermore, behavior, drinking, vocalization, and locomotive in sheep treated with P4 and P2 were significantly different (P<0.05) compared to the others. The resting frequencies of the five treatments showed the same results. The performance of local sheep with 100% sorinfer feed has better performance than others. Local sheep with 100% sorinfer administration had a higher frequency of ingestive behavior.
Keyword: behavior, concentrate, local sheep, performance, sorinfer

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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