Judul: Performance of Broiler in Different Feeding Frequency
Abstrak: Usaha peternakan ayam broiler merupakan salah satu usaha yang potensial untuk menghasilkan daging dan meningkatkan konsumsi protein bagi masyarakat. Faktor yang mempengaruhi keberhasilan usaha ayam broiler adalah pakan (feed), pembibitan (breeding), dan tatalaksana (manajemen). Penghematan biaya pakan merupakan tujuan yang harus dicapai dalam mendapat keuntungan yang maksimal dari hasil produksinya. Frekuensi pemberian pakan yang berbeda akan memberikan hasil performa yang berbeda. Penelitian dilaksanakan di Desa Babakan, Kecamatan Ciseeng, Kabupaten Bogor, Jawa Barat. Penelitian ini menggunakan 135 ekor ayam broiler CP 707umur satu hari Day Old Chick (DOC) tanpa dilakukan pemisahan antara jantan dan betina. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan perlakuan frekuensi pemberian pakan yang berbeda dan lima ulangan. Setiap ulangan terdiri dari 9 ekor ayam.Perlakuan frekuensi pemberian pakan yang diberikan adalah P1 (pakan diberikan pada pagi hari pukul 06.00 WIB sebanyak 100%), P2 (pakan diberikan pada pagi hari pukul 06.00 WIB sebanyak 50% dan sore hari pukul 17.00 WIBsebanyak 50%) dan P3 (pakan diberikan pada pagi hari pukul 06.00 WIB sebanyak 40 %, siang hari pukul 11.00 WIB sebanyak 20%, dan sore hari pukul 17.00 WIBsebanyak 40%). Peubah yang diamati meliputi konsumsi pakan, bobot badan akhir, pertambahan bobot badan, konversi pakan, mortalitas, dan indeks performa (IP). Hasil penelitian menunjukkan bahwa performa ayam broiler tidak berbeda nyata pada semua peubah. Perlakuan P3 memberikan keuntungan ekonomi lebih baik.
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Judul: Persentase Karkas dan Pertumbuhan Organ Dalam Ayam Broiler pada Frekuensi dan Waktu Pemberian Pakan yang Berbeda.
Abstrak: Broilers are genetically developed as rapid growing chickens to produce high abundant of meat in a short period. This potency can only be achieved by supporting of good quality of feed and appropriate feeding frequencies. Three different feeding frequencies with five replications were carried out for five weeks involving 135 broiler chickens in farm located in Babakan village, Ciseeng subdistrict, Bogor regency. The treatments were P1 (the feed was given in the morning at 06.00 am by 100%), P2 (the feed was given in the morning at 06.00 am by 50% and another 50% was given in the afternoon at 17.00 pm) and P3 (the feed was given in the morning at 06.00 am by 40%, in daytime at 11.00 am by 20% and in the afternoon at 17.00 pm by 40%). The traits observed were slaughtered weight, percentage of carcass and internal organs (liver, proventriculus, gizzard, small intestine and colon). All data were subjected to analyzes of variance (ANOVA). Income over feed and chick cost (IOFCC) were descriptively analized. The result showed that there were no significant different among treatments on slaughtered weight, percentage of carcass, liver, proventriculus, gizzard, small intestine, large intestine, leght of small intestine and large intestine. The treatment P3 resulted in highest IOFCC.
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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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