Judul: Penampilan Produksi dan Reproduksi Calon Induk Domba Lokal yang Mendapat Ransum dengan Sumber Energi yang Berbeda.
Abstrak: Usaha peternakan berkontribusi dalam memproduksi protein hewani, meningkatkan pendapatan peternak, menciptakan lapangan pekerjaan, dan melestarikan sumber daya alam. Salah satu usaha peternakan yang diminati adalah peternakan domba. Produktivitas domba lokal di Indonesia masih sangat rendah. Hal ini disebabkan rendahnya kualitas pakan yang diberikan oleh peternak kepada ternak dan kurangnya perencanaan terhadap target produksi dan reproduksi. Salah satu usaha yang dapat dilakukan untuk peningkatan penampilan produksi dan reproduksi ternak domba adalah melalui flushing. Penelitian ini dilakukan untuk mengetahui dan mempelajari pengaruh pemberian ransum dengan pakan sumber energi yang berbeda terhadap penampilan calon induk domba lokal. Penelitian ini dilakukan pada bulan Mei sampai dengan Juli 2010 di Laboratorium Lapang Ternak Daging dan Kerja, Departemen Ilmu Produksi dan Teknologi Peternakan, Fakultas Peternakan, Institut Pertanian Bogor. Ternak yang digunakan dalam penelitian ini adalah domba lokal (Jonggol) dara sebanyak 15 ekor dengan rataan bobot awal 16,1 ±1,17 kg. Ransum yang diberikan berupa hijauan dan konsentrat dengan rasio 40:60. Komposisi zat makanan ransum perlakuan disusun berdasarkan iso-kalori dan iso-protein (66% TDN dan 14% Protein). Penelitian menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan pakan sumber energi dan lima ulangan. Perlakuan pertama (P1) adalah ransum yang menggunakan sumber energi berasal dari jagung, perlakuan kedua (P2) menggunakan onggok, dan perlakuan ketiga (P3) menggunakan campuran jagung dan onggok. Peubah yang diamati adalah konsumsi bahan kering sebelum dan sesudah bunting, pertambahan bobot badan sebelum dan sesudah bunting, konversi pakan, kemunculan berahi pertama dan berhasil dikawinkan, nilai service per conception, dan jumlah kebuntingan serta jumlah fetus. Data konsumsi bahan kering sebelum dan sesudah bunting, pertambahan bobot badan sebelum dan sesudah bunting, dan konversi pakan dianalisis dengan ANOVA dan perbedaan yang nyata dilanjutkan dengan uji Tukey. Kemunculan berahi pertama dan berhasilkan dikawinkan, nilai service per conception, dan jumlah kebuntingan serta jumlah fetus dianalisis secara deskriptif. Analisis ragam menunjukkan bahwa pemberian pakan dengan bahan baku sumber energi yang berbeda tidak mempengaruhi konsumsi bahan kering sebelum dan sesudah bunting, pertambahan bobot badan sebelum dan sesudah bunting, konversi pakan, nilai service perconcetion, dan jumlah kebuntingan serta jumlah fetus. Dapat disimpulkan pemberian pakan dengan bahan baku sumber energi yang berbeda tidak mempengaruhi penampilan produksi dan reproduksi calon induk domba lokal (Jonggol)
Keyword: Sheep, Reproduction, Maize, Cassava, Production

Judul: Penampilan Produksi dan Reproduksi Calon Induk Domba Lokal (Jonggol) yang Mendapat Ransum dengan Sumber Energi Berbeda.
Abstrak: Animal farming takes role in providing the animal protein, increasing the income of the farmers, job generating and preserving the nature resources. Sheep farming belongs to a common business for local farmers, although the productivity of Indonesian local sheep is very low which is drived by genetic and environment. The crucial factors are the low feed quality and the absence of production and reproduction targets. Flushing with high quality feed becomes a choice. This experiment was conducted to study the effect of different energy sources in ration on the performance of the local (Jonggol) young ewes. A total of 15 local (Jonggol) young ewes were used within the body weight average of 16.1±1.17 kg. All ewes were fed a ration with 40:60 for forage and concentrate, respectively. Nutrients composition was calculated according to iso-energy and iso-protein (66% TDN and 14% protein). Completely randomized design (CRD) was applied with 3 different treatments of energy source of feed in 5 replications. The energy sources used were maize (P1), tapioca by product (cassava) (P2) and mixture of maize and cassava (P3). The variables measured were the dry matter consumption before and after pregnancy, body weight gain before and after pregnancy, feed conversion, first estrus and successful mating, service per conception rate and number of pregnancies and fetus. The first estrus and successful mating, service per conception rate and number of pregnancy and fetus were descriptively analyzed. Other variables were subjected to analyses of variance (ANOVA) and Tukey to test the differences. The results showed that different energy feedstuff has no effect on the dry matter consumption before and after pregnancy, body weight gain before and after pregnancy, feed conversion, service per conception rate, and number of pregnancy and fetus. As conclusion, ration with different energy sources had not influence to the productive and reproductive performances of local (Jonggol) young ewes.
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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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