Judul: Evaluation of the Grade of Hatching Eggs of Sensi-1 Agrinak and KUB Crossbred Chicken on Hatching and Production Performances
Abstrak: Ayam persilangan Sensi-1 Agrinak dan KUB (SENKUB) memiliki potensi menjadi ayam lokal unggul dwiguna. Potensi tersebut dapat diupayakan melalui peningkatan kualitas bibit dengan memperhatikan manajemen penetasan salah satunya penyeleksian bobot telur tetas. Penelitian ini bertujuan mengevaluasi grade bobot telur tetas yang berbeda dari hasil persilangan ayam Sensi-1 Agrinak dan KUB terhadap performa penetasan dan performa produksi yaitu pertumbuhan anak ayam hasil persilangannya. Rancangan penelitian yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan, yaitu bobot telur kecil (36-40 g butir-1), bobot telur sedang (41-45 g butir-1), dan bobot telur besar (46-50 g butir-1). Penelitian ini terdiri 2 tahap, yaitu tahap penetasan dan tahap pemeliharaan. Tahap pertama, penetasan dilakukan selama 21 hari dengan bahan utama yang digunakan adalah 245 butir telur tetas dari ayam SENKUB. Parameter yang diamati pada tahap pertama yaitu performa penetasan yang meliputi susut bobot telur, fertilitas, daya tetas, bobot tetas, salable chick, dan mortalitas embrio. Selanjutnya tahap kedua, pemeliharaan ayam dilakukan selama 63 hari (9 minggu) dengan bahan utama yang digunakan adalah 80 ekor ayam dari hasil penetasan telur tetas ayam SENKUB sebelumnya. Parameter yang diamati pada tahap kedua yaitu performa produksi yang meliputi konsumsi pakan, feed conversion ratio (FCR), pertambahan bobot badan (PBB), bobot badan akhir, mortalitas ayam, dan karkas, serta parameter mikroklimatik kandang yang meliputi suhu, kelembapan, dan temperature humidity index (THI)). Hasil penelitian menunjukkan grade bobot telur tetas besar (46-50 g butir-1) signifikan menghasilkan susut bobot terendah, bobot tetas tertinggi, dan nilai salable chick tertinggi. Fertilitas, daya tetas, dan mortalitas embrio tidak dipengaruhi oleh grade bobot telur tetas. Grade bobot telur tetas sedang dan besar terbaik untuk ditetaskan dengan memiliki bobot berkisar 41-50 g butir-1 untuk menghasilkan DOC yang memenuhi kriteria salable chick berdasarkan SNI. Grade bobot telur tetas besar dan sedang berturut-turut menghasilkan salable chick sebesar 100% dan 77,50%. Ayam hasil penetasan dari grade bobot telur tetas besar, sedang, dan kecil tidak berbeda pada performa produksi. Ayam dari grade bobot telur tetas kecil dan besar menghasilkan performa produksi lebih baik., Sensi-1 Agrinak and KUB crossbred chickens (SENKUB chickens) have the potential to become dual-purpose superior local chickens. This potency can be increased by improving the quality of seedlings by paying attention to hatching management, one of which was the selection of hatched egg weight. This study aimed to evaluate different hatched egg weight grades from Sensi-1 Agrinak and KUB crossbred chickens on hatching and production performance, namely the growth of chicks from crossbred. The experimental design was a Complete Random Design (CRD) with 3 treatments, which were small egg weight (36-40 eggs g-1), medium egg weight (41-45 eggs g-1), and large egg weight (46-50 eggs g-1). The study consisted of two stages, hatching and maintenance. The first stage, hatching was carried out for 21 days with the material used were 245 eggs hatched from SENKUB chickens. The parameters observed in the first stage were hatching performance, which included egg weight loss, fertility, hatchability, hatching weight, salable chick, and embryo mortality. Then in the second stage, maintenance was carried out for 63 days (9 weeks) with the material used were 80 chickens from hatching eggs
Keyword: Hatching egg weight, Hatching performance, Production performance, SENKUB chickens

Judul: External Quality of Hatching Eggs of Ayam  Kampung Unggul Balitbangtan (KUB) from Different Hen Ages
Abstrak: Peningkatan umur ayam dapat menyebabkan warna kerabang telur semakin pudar, kerabang telur semakin tipis dan bobot telur semakin berat sehingga menurunkan kualitas telur yang dihasilkan. Tujuan penelitian adalah menganalisis perbedaan kualitas eksternal telur tetas ayam KUB dari induk parent stock (PS) yang berumur 40 dan 60 minggu yang berasal dari pembibitan ayam Taman Teknologi Pertanian (TTP), Cigombong, Bogor, Jawa Barat. Kualitas eksternal telur yang diamati meliputi bobot, bentuk telur, indeks bentuk telur, bobot kerabang, kebersihan kerabang, warna kerabang dan tebal kerabang telur. Jumlah telur yang diamati sebanyak 30 butir setiap kelompok umur. Data yang diperoleh dianalisis dengan statistik deskriptif yaitu pada kebersihan kerabang, bentuk telur, warna kerabang, dan kehalusan kerabang. Uji T (T-Test) independen digunakan untuk menganalisis data bobot telur, indeks bentuk telur, bobot kerabang dan ketebalan kerabang. Hasil penelitian menunjukan perbedaan yang nyata (P<0,05) pada bobot telur, indeks bentuk telur, bobot kerabang dan ketebalan kerabang. Penelitian ini menduga faktor lingkungan kandang, dan juga kesehatan ayam juga menentukan kualitas eksternal eksternal telur., The increasing of hen age may reduce the hatching egg color and shell thickness, and also increase the hatching egg weight. The aim of the study was to analyze the differences in the external quality of hatching eggs from 40 (P1) and 60 weeks of age (P2) of KUB chicken parent stock produced by chicken breeding farm TTP Cigombong, Bogor, West Java. The external hatching egg quality observed were included off the weight, egg shape, egg shape index, shell weight, shell cleanliness, shell color and egg shell thickness. There were 30 hatching eggs which were observed in this study for each age of group. The shell cleanliness, egg shape, shell color and shell smoothness were analyzed descriptively. The egg weight, egg shape index, shell weight and shell thickness was analyzed by T test (T-Test) independent. There were significantly differences (P< 0.05) in the egg weight, shell weight, and hatching egg shell thickness between hatching eggs produced by hens aged 40 (P1) and 60 weeks (P2). This study predicts that the environmental factor, and also chicken health might influence the external quality of chicken hatching egg.
Keyword: hatching egg, hen age, KUB chicken, parent stock, quality

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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