Judul: Performa ayam broiler yang diberi hormon testosteron dengan dosis bertingkat
Abstrak: Testosterone is a hormone that has an important role in secondary sex characteristics. Testosterone was known as androgenic and anabolic hormone. This research used testosterone to observe the performance of broiler chickens. Fourty four broiler chickens 15 days old were divided into 4 groups: K (control), T1 (dose 1 mg), T2 (dose 2 mg), and T3 (dose 4 mg). Parameters measured were body weight, feed and water consumption, feed conversion ratio (FCR), and mortality. The results showed that testosterone dose 1 and 4 mg could increase the daily body weight gain significantly (p<0.05) in broiler chickens aged between 15 and 18 days old. Testosterone dose 2 mg could increase the daily body weight gain significantly (p<0.05) in broiler chickens aged between 21 and 24 days old. Final weight, the amount of feed and water consumption, feed conversion ratio (FCR), and mortality of chickens given testosterone did not show any difference compare with control.
Keyword: broiler, daily body weight gain, FCR, final weight, 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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