Judul: Evaluasi Penerapan Good Dairy Farming Practice di Cordero Farm Kabupaten Bogor.
Abstrak: Peternakan kambing perah merupakan salah satu sub sektor peternakan yang dapat membantu memenuhi gizi masyarakat. Produksi susu untuk memenuhi kebutuhan susu nasional masih belum optimal. Perlu peningkatan produktivitas pemeliharaan ternak dengan menggunakan Good Dairy Farming Practice. Tujuan penelitian adalah Evaluasi Good Dairy Farming Practice (GDFP) Kambing Perah di Cordero Farm. Penelitian dilakukan dengan metode survei di Cordero Farm, kabupaten Bogor pada bulan November sampai Desember 2015. Alat yang digunakan mengambil data adalah kuisioner. Teknik yang digunakan yaitu wawancara. Data yang diperoleh dianalisis deskriptif. Hasil penelitian menunjukkkan rata-rata penerapan Good Dairy Farming Practices (GDFP) aspek pemeliharaan di Cordero farm sebesar 2.73±0.40 termasuk dalam kategori cukup, bagian aspek pembibitan dan reproduksi hasil rata-rata yang diperoleh sebesar 2.14±0.90 termasuk kategori cukup, aspek manajemen pakan dan air minum nilai rata-rata 2.56±1.13 kategori cukup, nilai rata-rata bagian aspek pengelolaan 3.25±0.71 termasuk kategori baik, pada aspek kandang dan peralatan rata-ratanya 2.83±0.75 dapat dikategorikan cukup, aspek kesehatan ternak rata-rata yang didapat sebesar 2.67±0.58. Cordero farm perlu peningkatan manajemen pemeliharaan pada aspek pembibitan dan reproduksi ternak, manajemen pakan dan air minum, kandang dan peralatan serta kesehatan ternak yang lebih baik.
Keyword: Cordero farm, GDFP, kambing perah

Judul: Dairy Cow Milk Production and Quality Based on Good Dairy Farming Practice and Good Milking Practice at Pondok Ranggon
Abstrak: Pengembangan usaha peternakan sapi perah dapat dilakukan melalui penerapan standardisasi tatalaksana Good Dairy Farming Practice (GDFP) dan Good Milking Practice (GMiP). Oleh karena itu tujuan dari penelitian ini yaitu mengevaluasi dan memperbaiki aspek teknis melalui pedoman GDFP yaitu pembibitan dan reproduksi, pakan dan air minum, pengelolaan, kandang dan peralatan, kesehatan hewan, serta kesejahteraan hewan dan melalui pedoman GMiP yaitu faktor sebelum pemerahan, saat pemerahan, dan setelah pemerahan. Penelitian dilakukan dengan metode pengamatan secara langsung dan wawancara terhadap para peternak. Hasil evaluasi aspek teknis yang dibandingkan dengan nilai rata-rata pelaksanaan GDFP dan GMiP di peternakan Pondok Ranggon menunjukkan bahwa pelaksanaan aspek teknis GDFP termasuk dalam kategori baik yaitu 3,37±0,53 sedangkan aspek teknis GMiP dalam kategori sudah cukup baik yaitu 2,93±0,59. Hal ini diikuti dengan rataan produksi susu di kawasan Pondok Ranggon yang sudah cukup baik 9,19 L ekorˉ¹ hariˉ¹ dengan kualitas susu yang baik. Berdasarkan hasil penelitan ini pelaksanaan aspek teknis pemeliharaan sapi perah berdasarkan standar GDFP dan GMiP pada peternakan rakyat Pondok Ranggon perlu ditingkatkan lagi agar produksi dan kualitas susu yang dihasilkan lebih baik., Dairy farming business development can be done through the application of standardized procedures for Good Dairy Farming Practice (GDFP) and Good Milking Practice (GMiP). Therefore, the purpose of this study is to evaluate and improve technical aspects through GDFP guidelines, namely breeding and reproduction, feed and drinking water, management, cages and equipment, animal health, and animal welfare, and through GMiP guidelines, namely factors before milking, during milking, and after milking. The research was conducted by doing direct observation and interviews with farmers. The results of the evaluation of the technical aspects which were compared with the average value of the implementation of GDFP and GMiP at Pondok Ranggon farms showed that the implementation of the technical aspects of GDFP was categorized as good category, the score was 3.37±0.53, while the technical aspects of GMiP were categorized as adequate with the score was 2.93 ±0.59. The average milk production in the Pondok Ranggon area was adequate at 9.19 L head ˉ¹ dayˉ¹ with good milk quality. Based on the results it is concluded that the implementation of the technical aspects of raising dairy cows based on the GDFP and GMiP standards on the Pondok Ranggon people's farm should be improved.
Keyword: breeders, dairy cow, GDFP, GMiP, milk

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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