Judul: Carcass Percentage, Commercial Cuts, and  Non-Carcass Parts of IPB-D3 Chickens at Different Slaughter Ages and Locations
Abstrak: Ayam lokal memiliki ketahanan tubuh yang lebih tinggi dibandingkan dengan ayam ras. Ayam IPB-D3 merupakan calon galur baru pejantan (male line) yang dibentuk dari hasil seleksi ayam IPB-D1 G7 berdasarkan pertumbuhan bobot badan yang cepat pada umur 12 minggu. Pertumbuhan bobot badan yang cepat dapat dipengaruhi oleh genetik dan lingkungan. Penelitian ini bertujuan mengevaluasi persentase karkas, potongan karkas secara komersial dan bagian non karkas pada ayam IPB-D3 pada umur potong dan lokasi berbeda, yaitu Sukabumi, Bogor, dan Boyolali. Penelitian ini menggunakan ayam IPB-D3 Sukabumi sebagai data primer dan ayam IPB-D3 Bogor dan Boyolali sebagai data sekunder pembanding, masing-masing berjumlah 30 ekor. Berdasarkan hasil yang didapat adalah ayam IPB-D3 Sukabumi memiliki persentase karkas yang lebih rendah dibandingkan dengan ayam IPB-D3 Bogor dan Boyolali, akan tetapi bagian persentase non karkas ayam IPB-D3 Sukabumi lebih tinggi dibandingkan dengan ayam IPB-D3 Bogor dan Boyolali, Local chickens have higher immune resilience compared to commercial breeds. IPB-D3 chickens are a new male line strain created by selecting IPB-D1 G7 chickens based on their rapid body weight growth at 12 weeks. Tight body weight growth can be influenced by genetics and the environment. This research aims to evaluate the carcass percentage, commercially cut carcass pieces, and non-carcass parts of IPB-D3 chickens at different ages and locations, namely Sukabumi, Bogor, and Boyolali. The study utilizes IPB-D3 Sukabumi chickens as primary data and IPB-D3 Bogor and Boyolali chickens as secondary comparative data, with each group comprising 30 individuals. Based on the results, it is found that IPB-D3 Sukabumi chickens have a lower carcass percentage compared to IPB-D3 Bogor and Boyolali chickens. However, the percentage of non-carcass parts in IPB-D3 Sukabumi chickens is higher than in IPB-D3 Bogor and Boyolali chickens
Keyword: Carcass percentage, Non-carcass percentage, IPB-D3 chicken

Judul: Comparison of Non-Carcass Weight Percentage between IPB-D2 and IPB-D3 Chickens at Different Slaughter Age
Abstrak: Ayam lokal Indonesia merupakan komoditas yang banyak dipelihara oleh masyarakat untuk memenuhi kebutuhan ekonomi dan sumber protein hewani namun memiliki produktivitas yang sangat rendah. Ayam IPB-D1 merupakan rumpun baru ayam lokal yang telah dilakukan upaya peningkatan mutu genetik. Ayam IPB-D2 dan IPB-D3 yang merupakan keturunan ayam IPB-D1 yang diseleksi dengan tujuan menjadi calon galur baru dengan tingkat ketahanan tubuh yang baik serta pertumbuhan bobot badan yang cepat. Tujuan dari penelitian ini adalah menilai persentase bobot non karkas ayam jantan IPB-D2 dan IPB-D3 pada umur potong berbeda. Ayam yang digunakan adalah 100 ekor DOC IPB-D2 G3 dan 100 ekor DOC IPB-D3 G1. Penelitian dilakukan pada bulan September hingga Desember 2021 di Laboratorium Lapangan Pemuliaan dan Genetika Ternak, Fakultas Peternakan, Institut Pertanian Bogor. Peubah yang diamati adalah bobot kepala, ceker, usus total, hati, rempela, jantung, dan ginjal. Data yang diperoleh dianalisis dengan uji deskriptif dan uji t. Persentase bobot non karkas tertinggi ayam IPB-D2 G3 terdapat pada umur 12 minggu (24,26%) dan ayam IPB-D3 G1 pada umur11 minggu (25,78%)., Indonesian local chicken is the most widely kept by the community because it can meet the economic needs and source of animal protein but with very low productivity. IPB-D1 chickens are a new family of local chickens that have improved genetic quality. IPB-D2 and IPB-D3 chickens are descendants of IPB-D1 chickens that are selected to become candidates for new strains with a good level of body resistance and rapid bodyweight growth. This study purposes to assess the percentage of the non-carcass weight of IPB-D2 and IPB-D3 chickens at different slaughter ages. The chickens used were 100 DOC IPB-D2 G3 and 100 DOC IPB-D3 G1. The research was conducted from September to December 2021 at the Laboratory of Animal Breeding and Genetics Field, Faculty of Animal Husbandry, Bogor Agricultural University. The observed variables were head weight, claws, total intestine, liver, gizzard, heart, and kidney. The data obtained were analyzed by descriptive test and t-test. The highest percentage of the non-carcass weight of IPB-D2 G3 chickens was found at 12 weeks of age (24,26%) and IPB-D3 G1 chickens at 11 weeks of age (25,78%).
Keyword: IPB-D2 line chicken, IPB-D3 line chicken, non carcass weight

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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