Judul: Persentase Bobot Karkas, Potongan Komersial dan Non Karkas Ayam IPB-D2 Generasi Keempat pada Umur 10 sampai 12 Minggu
Abstrak: Ayam lokal umumnya mudah dipelihara dan sistem ketahanan terhadap penyakit cukup baik serta adaptasi terhadap lingkungan cukup tinggi. Ayam IPB-D2 merupakan galur baru indukan (female line) yang dibentuk dari hasil seleksi ayam IPB–D1 berdasarkan sifat ketahanan penyakit yang baik dengan proporsi darah sama dengan ayam IPB–D1. Tujuan penelitian ini untuk mengkaji dan mengevaluasi persentase bobot karkas dan non-karkas, serta potongan komersial karkas dan non-karkas ayam IPB–D2 umur 10 hingga 12 minggu. Penelitian ini menggunakan ayam IPB-D2 Sukabumi sebagai data primer dan ayam IPB-D2 Boyolali sebagai data sekunder dengan jumlah ayam masingmasing 30 ekor. Jumlah ayam IPB-D2 G4 keseluruhan yang digunakan sebanyak 15 ekor. Hasil penelitian ini menunjukkan bahwa persentase karkas ayam IPBD2 Sukabumi lebih rendah dibandingkan Boyolali. Namun persentase bagian non karkas ayam IPB-D2 Sukabumi lebih tinggi dibandingkan Boyolali., Local chickens are generally easy to raise and have a fairly good system of disease resistance and high adaptation to the environment. IPB-D2 chickens are a new breed of broodstock (female line) which was formed from the selection of IPB-D1 chickens based on good disease resistance characteristics with the same blood proportion as IPB-D1 chickens. The aim of this research was to examine and evaluate the percentage of carcass and non-carcass weight, as well as commercial cuts of carcass and non-carcass IPB–D2 chickens aged 10 to 12 weeks. This research used IPB-D2 Sukabumi chickens as primary data and IPB-D2 Boyolali chickens as secondary data with 30 chickens each. The total number of IPB-D2 G4 chickens used was 15. The results of this research show that the percentage of IPB-D2 Sukabumi chicken carcasses is lower than Boyolali. However, the percentage of non-carcass portion of IPB-D2 Sukabumi chicken is higher than Boyolali.
Keyword: carcass, commercial, IPB-D2 chicken, non-carcass

Judul: Percentage of Carcass Weight and Commercial Cuttings of Third Generation IPB-D2 Male Candidate Breeds Aged 10 to 12 Weeks
Abstrak: Ayam IPB-D1 merupakan rumpun ayam lokal baru yang berhasil dikembangkan oleh Institut Pertanian Bogor. Dilakukan seleksi ayam IPB-D1 berdasarkan konsentrasi IgY dan titer antibodi ND untuk mendapatkan ayam kandidat galur IPB-D2. Penelitian ini bertujuan mengkaji persentase bobot karkas dan potongan komersial ayam jantan kandidat galur IPB-D2 G3. Ayam yang digunakan berjumlah 24 ekor ayam jantan kandidat galur IPB-D2. Peubah yang diamati adalah persentase bobot karkas dan potongan komersial. Data yang diperoleh dianalisis dengan uji deskriptif dan di uji t dengan ayam jantan kandidat galur IPB-D3 G1 dan ayam jantan IPB-D1 Sukabumi. Hasil penelitian menunjukkan persentase karkas ayam jantan kandidat galur IPB-D2 G3 meningkat. Ayam jantan kandidat galur IPB-D2 G3 memiliki bobot serta persentase karkas dan potongan komersial lebih tinggi dibandingkan dengan ayam jantan IPB-D1 Sukabumi. Ayam jantan kandidat galur IPB-D2 G3 memiliki kualitas karkas yang baik., IPB-D1 chicken is a new local chicken breed successfully developed by Bogor Agricultural University. IPB-D1 chickens were selected based on IgY concentration and ND antibody titer to obtain IPB-D2 candidate strains. This study aimed to assess the percentage of carcass weight and commercial cuts of IPB-D2 G3 candidate roosters. The chickens used amounted to 24 roosters of IPB D2 candidate strains. The observed variables were the percentage of carcass weight and commercial cuts. The data obtained were analyzed by descriptive test and t-test with IPB-D3 G1 and IPB-D1 Sukabumi candidate roosters. The results showed that the carcass percentage of IPB-D2 G3 candidate roosters increased. IPB-D2 G3 candidate roosters had higher carcass weight and percentage and commercial cuts compared to IPB-D1 Sukabumi roosters. IPB-D2 G3 candidate roosters had good carcass quality.
Keyword: ayam IPB-D2, bobot karkas, potongan komersial

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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