Judul: Gambaran Kecernaan Pakan Ayam Broiler yang diberi Testosteron dengan Dosis Bertingkat
Abstrak: Testosterone is one of the anabolic hormone that can trigger the growth of muscle mass as well as develop and maintain bone. Testosterone hormone can stimulate secretion of other hormones such as growth hormone. This research was conducted to describe the administration of testosterone hormone with multilevel concentration on broiler chicken’s feed digestibility through feces analysis. Fourteen days of twenty broiler chickens were used in this experiment, with 4 groups (K, T1, T2, and T3). K was control groups, T1, T2, and T3 were broiler chicken which given 1, 2, and 4 mg testosteron respectively. Feces is waste of metabolism which can be used for proximate analysis. Feed digestibility values was obtained from the difference percentage between the value of proximate analysis of feed and feces which divided by the value of the proximate analysis of feed. The highest digestibility values of fat (79.20%), protein (65.37%), and carbohydrates (69.79%) was in T3 groups. Therefore administration of 4 mg testosterone could increase the body weight.
Keyword: digestibility, feces, hormones, proximate, testosterone.

Judul: Gambaran kecernaan pakan ayam broiler yang diberi testosteron dengan dosis bertingkat
Abstrak: Testosteron merupakan salah satu hormon anabolik yang dapat memicu pertumbuhan massa otot serta mengembangkan dan memelihara tulang.Hormon testosteron mampu merangsang sekresi hormon lain seperti growth hormone. Penelitian ini bertujuan untuk mempelajari pengaruh penambahan hormon testosteron dengan konsentrasi bertingkat pada ayam broiler terhadap kecernaan pakan melalui analisis feses. Penelitian ini menggunakan dua puluh ayam broiler berumur 14 hariyang dibagi dalam 4 grup (K, T1, T2, dan T3). K adalah kelompok kontrol, T1, T2, dan T3 ayam broiler yang dilakukan pemberian 1, 2, dan 4 mg testosteron. Feses yang merupakan eksresi hasil metabolisme diambil dari setiap perlakuan untuk dilakukan analisa proksimat. Nilai kecernaan pakan didapat dari persentasi selisih nilai analisa proksimat pakan dengan feses dibagi nilai analisa proksimat pakan. Nilai kecernaan paling tinggi pada kadar lemak kasar (79.20%), protein (6.37%), dan BETN (69.79%) ada pada kelompok T3. Oleh karena itu, pemberian 4 mg testosteron dapat meningkatkan bobot badan
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Digestibility, Feces, Hormones, Proximate, Testosterone

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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