Judul: Penerapan good breeding practices sapi potong di PT lembu jantan perkasa Serang-Banten
Abstrak: Cow-calf production is fundamental to the other cattle production system, i.e growing of stocker and cattle finishing. Good Breeding Practices (GBP) for beef cattle is important for breeding goal achievement that is producing breeding animal. The scope of GBP in beef cattle farming includes four aspects: facilities, cattle breeding, environmental protection and supervision. The study aimed to examine the Good Breeding Practices for beef cattle at PT Lembu Jantan Perkasa (LJP) in Serang -Banten. Descriptive analysis was used to review the breeding operation in PT LJP Serang-Banten. The breeding parameters observed were calving interval, service per conception, conception rate, and calving rate. The result showed that in general the company had applied well GBP in its operation. There were several aspects that should be considered to improve the GBP operation those site plant building and security, replacement stock, and animal health. Calving interval are 408 days in 2009 and 372 days in 2010. Service per conception are 1,6 in 2009 and 1,5 in 2010. Conception rate are 78% in 2009 and 88% in 2010 and calving rate are 23% in 2009 and 84% in 2010.
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Judul: Penerapan good farming practices sapi penggemukan di PT lembu jantan perkasa Serang-Banten
Abstrak: Good farming practice (GFP) is a guidline for good beef cattle raising in order to improve the existing cattle fattening operation. The scope of GFP in beef cattle farming includes four aspects: facilities, production processes, environmental protection and supervision. PT Lembu Jantan Perkasa is one of beef cattle company engaged in breeding, fattening and cattle trading. The application of GFP becomes very important for these companies to produce environmentally freindly beef cattle with high productivity. In general PT Lembu Jantan Perkasa has a play well four aspect: facilities, production processes, environmental protection and supervision. As a results the beef cattle has performance very well in feedlot as indicated by high daily gain: steer 1,67 kg/day, bull 1,48 kg/day, heifer 1,36 kg/day in 2010. These were several aspect need to be consider in order to improve the implementation GFP. Those include: site plant building and biosecurity.
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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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