Judul: Efek Warna Cahaya Penerangan Berbeda pada Ayam Broiler Terhadap Bobot Hidup, Persentase Karkas dan Potongan Komersial Karkas
Abstrak: Secara umum pertumbuhan ayam broiler dipengaruhi oleh cahaya. Cahaya terdiri dari tiga aspek yang berbeda yaitu intensitas, lama pencahayaan, dan warna cahaya. Pada kondisi lingkungan yang dapat dikendalikan, ayam mempunyai kepekaan terhadap berbagai warna cahaya. Di antara warna cahaya yang ada, ayam mempunyai kepekaan paling baik terhadap warna hijau, biru, merah, dan kuning. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian berbagai warna cahaya lampu sebagai tambahan penerangan pada malam hari terhadap bobot hidup, persentase karkas dan potongan komersial ayam broiler. Ternak yang digunakan adalah ayam broiler strain Ross umur satu hari sebanyak 160 ekor yang dipelihara sampai umur 34 hari. Perlakuan dimulai pada saat ayam berumur lima belas hari. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan empat perlakuan pemberian warna cahaya lampu penerangan yaitu kuning, merah, biru dan hijau. Setiap perlakuan terdiri dari lima ulangan dengan masingmasing terdiri atas delapan ekor ayam. Peubah yang diukur adalah bobot hidup, persentase karkas dan potongan komersial ayam broiler (dada, paha, sayap dan punggung). Data yang diperoleh dianalisis dengan ragam. Hasil penelitian pada masing-masing peubah yang diamati adalah sebagai berikut: rataan bobot hidup yang diperoleh berkisar antara 1.461,10 – 1.573,80 gram/ekor. Persentase karkas berkisar antara 60,52 – 69,91 % dari bobot hidup. Persentase dada, paha, sayap dan punggung yang diperoleh berkisar antara 38,06 – 38,86 %, 30,02 – 30,88 %, 12,67 – 15,67 % dan 22,46 – 23,34 %. Warna cahaya lampu penerangan kandang yang diberikan setelah masa brooding tidak berpengaruh terhadap bobot hidup, persentase karkas, dan persentase potongan komersial (dada, paha, sayap, punggung).
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Judul: Pengaruh warna lampu penerangan terhadap bobot hidup, persenntase karkas, giblet dan lemak abdomen ayam broiler
Abstrak: One hundred and sisty day-old chicks were used in a completely randomized design to investigate the effect of colored lighting on broiler live weight, carcass, giblet (gizzard, heart, liver) and abdominal fat percentages. Four treatment utilized were yallow (P1), red (P2), green (P3) and blue (P4). Each treatment replicated five times with eight bird in each replication. Treatment were applied when the chicks had reached the age of 2 weeks up to 5 weeks. After 5 weeks of rearing the chickens were weighted and slaughtered. Carcass, giblet (gizzard, heart, liver) and abdominal fat were weighted and the percentage to live weight were calculated. Data recorded were analysed using analysis ov variance. The result showed there were no significant different caused by the treatments.
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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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