Judul: Phenotypic characteristic and production system of buffalo (Bubalus bubalis) as a basis for the development of a village breeding program in Banten
Abstrak: Keberadaan kerbau rawa di Provinsi Banten sedemikian rupa telah menyatu dengan kondisi sosial dan budaya masyarakat setempat. Perannya dalam kehidupan sehari-hari adalah sebagai ternak kerja untuk membajak sawah, sumber daging dan tabungan. Mengingat peran kerbau rawa bagi kehidupan peternak di Provinsi Banten sangat penting, maka diperlukan upaya-upaya peningkatan dan pelestarian kerbau yang berkelanjutan. Penelitian ini dilakukan untuk mengetahui keragaman fenotipe melalui analisis morfometrik, mempelajari pengetahuan, motivasi dan partisipasi peternak dalam kegiatan pemuliaan kerbau, dan menyusun pola pemuliaan kerbau pada peternakan rakyat di Banten. Metode penelitian yang digunakan adalah survey. Penentuan sampel berdasarkan purposive sampling sehingga penelitian ini dilakukan di Kabupaten Serang, Pandeglang dan Lebak. Materi penelitian yang digunakan adalah 300 ekor kebau rawa dewasa dan 60 orang responden peternak kerbau di Kabupaten Serang, Pandeglang serta Lebak Provinsi Banten. Data yang dihimpun merupakan data primer. Data sekunder terdiri atas 100 ekor kerbau rawa Aceh Besar, 99 ekor kerbau Hulu Sungai Selatan, 50 ekor kerbau Pleihari, 39 ekor kerbau Dompu, 40 ekor kerbau Hu’u, 40 ekor kerbau Kempo, 40 ekor kerbau Pajo, dan 40 ekor kerbau Woja. Data sekunder berasal dari data penelitian peneliti pada kerjasama kemitraan penelitian pertanian dengan perguruan tinggi (KKP3T) pada tahun 2007, digunakan pada penentuan jarak genetik antarpopulasi kerbau rawa Indonesia.
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Judul: Karakteristik Produksi dan Potensi Pengembangan Kerbau Rawa pada Daerah Basah dan Kering di Kabupaten Bima
Abstrak: The purpose of this research was to study the characteristics and potential production of swamp buffalo in wet and dry areas of Bima regency. The study used survey and direct observation methods on the targeted areas. The primary and secondary data were collected and analyzed descriptively. The buffaloes in Belo district were semi-intensively reared, whereas those in Wera district were extensively reared. The buffalo in Belo district had sex ratio, age of first mating, age of first parturition, calving rate, calf crop, calf mortality, periode of first mating after calving, and calving interval were 1:3, 3.4 years, 4.2 years, 91.1%, 76.2%, 12%, 2.4 months, 15.9 months respectively. Meanwhile, the reproductive characteristics in Wera district were 1:3, 3.3 years, 4.1 years, 84.2%, 70.3%, 17.1%, 2.3 months 14.4 months respectively. The buffaloes in Belo had BCS 2 (35%), BCS 3 (60%), and BCS 4 (5%), whereas in Wera have BCS 2 (45%), BCS 3 (50%) and BCS 4 (5%). In general, the buffaloes In Belo had better performance compared to that in Wera district. However, the potential land and feed resources for development of buffalo in Wera district still high compared with Belo district.
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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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