Judul: Carcass and Non Carcass Charasteristics of  Candidate Chicken Strain IPB-D3 Fourth Generation at Slaughter Age 12 Week
Abstrak: Indonesia kaya akan sumber daya genetik ayam lokal dengan daya tahan dan adaptasi lingkungan yang baik, namun produktivitasnya rendah. Ayam IPB-D1 merupakan ayam hasil perbaikan genetik dari ayam lokal Indonesia kemudian diseleksi berdasarkan pertumbuhan bobot badannya sebagai calon ayam galur IPB D3. Penelitian ini bertujuan untuk mengevaluasi karakteristik karkas dan non karkas calon galur ayam IPB-D3 generasi keempat umur 12 minggu. Ayam yang digunakan adalah ayam jantan calon galur ayam IPB-D3 G4 sebanyak 20 ekor. Penelitian dilaksanakan pada bulan November 2023 sampai Februari 2024 di Laboratorium Lapang Pemuliaan dan Genetika Ternak, Fakultas Peternakan, IPB University. Peubah yang diamati yaitu bobot dada, paha atas, paha bawah, sayap, punggung, kepala, leher, ceker, hati, usus, rempela, jantung, paru-paru, dan limfa. Data dianalisis dengan uji deskriptif dan uji T. Hasil penelitian menunjukkan persentase karkas calon galur ayam IPB-D3 G4 lebih kecil dan persentase non karkas yang lebih besar dari calon galur ayam IPB-D3 G1. Karkas dan non karkas ayam IPB-D3 G4 umur 12 minggu berturut-turut sebesar 59,71% dan 29,85%., Indonesia is rich in genetic resources of local chickens with good endurance and environmental adaptation, but their productivity is low. IPB-D1 chicken is a chicken that is the result of genetic improvement from local Indonesian chickens and then selected based on body weight growth as a candidate for the IPB-D3 chicken line. This study aims to evaluate the carcass and non-carcass characteristics of prospective fourth generation IPB-D3 chicken lines aged 12 weeks. The chickens used were 20 roosters of the IPB-D3 G4 chicken breed. The research was carried out from November 2023 to February 2024 at the Animal Breeding and Genetics Field Laboratory, Faculty of Animal Husbandry, IPB University. The variables observed were the weight of the chest, upper thigh, lower thigh, wings, back, head, neck, feet, liver, intestines, gizzard, heart, lungs and spleen. Data were analyzed using descriptive tests and T tests. The results showed that the carcass percentage of the prospective IPB-D3 G4 chicken line was smaller. The percentage of non carcass was greater than the prospective IPB-D3 G1 chicken line, respectively at 59.71% and 29.85%.
Keyword: ayam IPB-D2, ayam IPB-D3, bobot karkas, bobot non karkas

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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