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: Performa Penetasan Ayam SENKUB di Kandang Inti Desa Tunggulo dengan Lama Penyimpanan Telur yang Berbeda
Abstrak: Telur sebelum inkubasi disimpan terlebih dahulu di ruang penyimpanan telur untuk mencukupi kapasitas telur dalam mesin tetas. Penelitian ini bertujuan mengkaji pengaruh lama penyimpanan telur ayam SENKUB terhadap performa penetasan. Bahan yang digunakan adalah 120 butir telur ayam SENKUB. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 5 ulangan. Perlakuan yang digunakan adalah lama penyimpanan telur yang terdiri atas 3 hari (P1), 5 hari (P2), dan 7 hari (P3). Parameter yang diamati meliputi penyusutan bobot telur, kedalaman kantung udara, fertilitas, daya tetas telur fertil, bobot tetas, salable chick, dan fase kematian embrio. Hasil penelitian menunjukkan lama penyimpanan telur tetas ayam SENKUB kurang dari 5 hari memiliki hasil performa penetasan yang baik. Penyimpanan yang semakin lama pada telur tetas menyebabkan penurunan kualitas telur yang ditandai dengan menurunnya nilai fertilitas, daya tetas telur fertil, dan salable chick, namun nilai penyusutan bobot telur dan bobot tetas relatif sama. Fase kematian embrio terjadi pada fase awal inkubasi dan akhir inkubasi. Penyebab kematian embrio sebagian besar disebabkan oleh penanganan telur saat proses penetasan., Eggs before incubation are first stored in the egg storage room to meet the egg capacity in the incubator. This study aims to determine the effect of storage time for SENKUB chicken eggs on hatching performance. The material used is 120 eggs of SENKUB chicken. The design used was a Complete Random Design (CRD) with 3 treatments and 5 replications. The treatments used were egg storage times consisting of 3 days (P1), 5 days (P2), and 7 days (P3). Parameters observed included weight loss of eggs, depth of air sacs, fertility, hatchability of fertile egg, hatching weight, salable chick, and embryonic death phase. The results showed that the storage time for hatching eggs of SENKUB chickens of less than 5 days had food hatching performance. The longer storage of hatching eggs causes a decrease in egg quality which is indicated by a decrease in the value of fertility, hatchability of fertile egg, and salable chick, but weight loss of egg and hatching weight are relatively the same. The embryonic death phase occurs in the early and late incubation phases. The cause of embryo death is mostly due to the handling of the eggs during the hatching process.
Keyword: SENKUB chicken, Egg storage time, The hatching performance

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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