Judul: Morphometrics of IPB-D1, IPB-D2 and IPB-D3 Chickens aged 4 to 12 weeks at Sinar Harapan Farm Sukabumi
Abstrak: Ayam IPB-D1 adalah ayam lokal pedaging unggul hasil pemuliaan. Pengembangan ayam IPB-D1 menghasilkan calon galur ayam IPB-D2 dan IPB-D3. Penelitian mengenai morfometrik ayam IPB-D di Kabupaten Sukabumi belum dilakukan. Penelitian ini bertujuan mengevaluasi morfometrik ayam IPB-D1, IPBD2 dan IPB-D3 di Kabupaten Sukabumi. Rancangan pada penelitian ini adalah Rancangan Acak Lengkap dengan 3 taraf perlakuan galur yaitu IPB-D1, IPB-D2 dan IPB-D3 dengan selang kepercayaan 95%. Perlakuan yang berpengaruh nyata dilanjutkan uji Tukey. Parameter yang diukur adalah bobot badan dan morfometrik seperti panjang shank, lingkar shank, panjang femur, panjang tibia, panjang dada, lebar dada, dalam dada, lingkar dada, dan panjang punggung. Hasil penelitian menunjukkan bahwa ukuran tubuh ayam IPB-D2 dan IPB-D3 berbeda. Ayam IPBD3 memiliki morfometrik yang lebih besar dibandingkan ayam IPB-D2 pada umur 4-8 minggu, namun pada umur 10-12 minggu ayam IPB-D3 memiliki ukuran tubuh yang lebih kecil dibandingkan ayam IPB-D2. / IPB-D1 chicken is a local breeder of superior broilers. The development of IPB-D1 chicken produced the candidate strains IPB-D2 and IPB-D3. Research on the morphometrics of IPB-D chicken in Sukabumi district has not been conducted. This study aimed to evaluate the morphometrics of IPB-D1, IPB-D2 and IPB-D3 chickens in Sukabumi District. The design of this study was a completely randomized design with 3 levels of treatment strains namely IPB-D1, IPB-D2 and IPB-D3 with 95% confidence interval. Treatments that had a significant effect were followed by the Tukey test. Parameters measured were body weight and morphometrics such as shank length, shank circumference, femur length, tibia length, breast length, breast width, breast depth, breast circumference and back length. The results showed that the body size of IPB-D2 and IPB-D3 chickens were different. IPB-D3 chickens have larger morphometrics than IPB-D2 chickens at 4- 8 weeks of age, but at 10-12 weeks of age IPB-D3 chickens have a smaller body size than IPB-D2 chickens., IPB-D1 chicken is a local breeder of superior broilers. The development of IPB-D1 chicken produced the candidate strains IPB-D2 and IPB-D3. Research on the morphometrics of IPB-D chicken in Sukabumi district has not been conducted. This study aimed to evaluate the morphometrics of IPB-D1, IPB-D2 and IPB-D3 chickens in Sukabumi District. The design of this study was a completely randomized design with 3 levels of treatment strains namely IPB-D1, IPB-D2 and IPB-D3 with 95% confidence interval. Treatments that had a significant effect were followed by the Tukey test. Parameters measured were body weight and morphometrics such as shank length, shank circumference, femur length, tibia length, breast length, breast width, breast depth, breast circumference and back length. The results showed that the body size of IPB-D2 and IPB-D3 chickens were different. IPB-D3 chickens have larger morphometrics than IPB-D2 chickens at 4- 8 weeks of age, but at 10-12 weeks of age IPB-D3 chickens have a smaller body size than IPB-D2 chickens.
Keyword: morfometrik, ayam IPB-D1, ayam IPB-D2, ayam IPB-D3, Kabupaten Sukabumi

Judul: Morphometrics of Fourth Prospective Generation IPB-D3 Chickenss Aged 2 to 12 Weeks
Abstrak: Ayam lokal IPB-D3 merupakan ayam PSKB generasi ketiga hasil persilangan antara jantan (pelungx sentul) dan betina (kampungxras pedaging) dengan komposisi genetik masing-masing 25%. Persilangan ayam ini bertujuan untuk menghasilkan ayam lokal dengan kualitas bobot badan seperti ayam broiler. Penelitian dilaksanakan pada bulan November 2023 sampai Februari 2024 di Laboratorium Pemuliaan Ternak dan Genetika Fakultas Peternakan Institut Pertanian Bogor. Variabel yang diukur setiap 2 minggu sekali adalah panjang betis, lingkar betis, panjang badan tibia, panjang tulang paha, panjang dada, lebar dada, dada, lingkar dada, panjang punggung, panjang sayap, dan panjang leher. Pengukuran berat badan dilakukan setiap minggu. Data dianalisis deskriptif dan uji t. Hasil penelitian menunjukan ukuran tubuh ayam IPB-D3 G4 relatif lebih besar dibandingkan dengan ukuran tubuh ayam IPB-D3 G2. Pada umur 12 minggu hasil penelitian menunjukan hanya ukuran panjang dada dan lingkar shank yang memiliki ukuran lebih kecil dibandingkan penelitian sebelumnya. Berdasarkan 10 peubah yang diukur selama 12 minggu, morfometrik ayam IPB-D3 generasi ke-4 memiliki koefisien keragaman rendah. Ukuran tubuh lebar dada memiliki keragaman terendah dan keragaman lingkar shank tinggi. Ukuran tubuh ayam IPB-D3 antar generasi masih beragam., The local IPB-D3 chicken is a third generation PSKB chicken resulting from a cross between a male (pelungx sentul) and a female (kampungxras broiler) with a genetic composition of 25% each. This chicken crossing aims to produce local chickens with body weight qualities like broiler chickens. The research was carried out from November 2023 to February 2024 at the Animal Breeding and Genetics Laboratory, Faculty of Animal Husbandry, Bogor Agricultural Institute. Variables measured every 2 weeks were calf length, calf circumference, tibial body length, femur length, chest length, chest width, chest circumference, back length, wing length and neck length. Body weight measurements were carried out every week. Data were analyzed descriptively anad by t test. The research results showed that the body size of IPB-D3 G4 chickens was relatively larger than the body size of IPB-D3 G2 chickens. At 12 weeks of age, the results of the study showed that only the chest length and shank circumference were smaller than in previous studies. Of the 10 variables measured over 12 weeks, the morphometrics of the 4th generation IPB-D3 chickens had a low coefficient of variation. Body size, chest width, has the lowest diversity and the highest diversity in shank circumference. The body size of IPB-D3 chickens between generations still varies.
Keyword: crosses, fourth generation, IPB-D3 chicken, morphometrics

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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