Judul: Evaluasi kombinasi suplemen terhadap kualitas makroskopis semen domba yang ransumnya dicemari timbal
Abstrak: This research was conducted to evaluate the quality of cement by makroskopis at contaminated sheep by lead getting suplemen This research was conducted in Bagian Ruminansia Kecil, Departemen Ihu Produksi Temak, Fakultas Petemakan IPB from June until October 200.1. This research use 24 male sheep \which come from Caringin. Sheep divided to become four group based on body wight, each group consist of six sheep. Treatment the given is feed which consist of six treatment First-treatment, sheep get dropsy ransum ( RO), that is mnarm to fulfill requirement of sheep nutrisi according to recommendation of NRC ( 1989). Second treatment, sheep get ransum which consist of dropsy rannun RO + lead 4.5 ppm (Rl). Third treatment, sheep get ransum which consist of Rl ransum + 1% protein of yeast (R2).
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Judul: Damping toxicity of lead (Pb) and stimulation productivity ruminant animals with supplement proteinate mineral and chitosan also brown seaweed extract
Abstrak: Tujuan dari penelitian ini adalah mempelajari dan mengevaluasi peredaman toksisitas timbal (Pb) dan stimulasi kinerja produksi ternak ruminansia dengan suplemen mineral proteinat dan khitosan serta ekstrak rumput laut coklat. Sebanyak 24 ekor domba jantan (dengan berat sekitar 18.28±2.43 kg) digunakan sebagai hewan percobaan. Menggunakan Rancangan Acak kelompok (RAK) dengan 6 perlakuan dan 4 kali ulangan (bobot badan sebagai blok). Perlakuan yang diberikan adalah sebagai berikut R0 = Ransum dasar, R1 = R0 ditambah Pb-asetat, R2 = R1 ditambah Proteinat, R3 = R2 ditambah Mineral proteinat , R4 = R3 ditambah Khitosan, R5 = R3 ditambah ekstrak rumput laut coklat. Percobaan dilaksanakan selama 16 minggu. Hasil penelitian ini menunjukkan bahwa konsumsi bahan kering ransum domba percobaan R2, R3, R4, R5 lebih tinggi dibandingkan R1 (p<0.01). Kecernaan bahan kering ransum domba percobaan R2, R3, R4, R5 lebih tinggi dibandingkan ransum R1 (p<0.01). Populasi dari protozoa, pH rumen dan kandungan Pb didalam urine tidak dipengaruhi oleh perlakuan (p>0.05). Suplementasi menggunakan proteinat (R2), mineral proteinat (R3), khitosan (R4) dan ekstrak rumput laut coklat dapat meningkatkan populasi dari bakteri rumen, produksi NH3, produksi asetat, butirat, pertambahan bobot badan dan dan kandungan Pb dalam feses (p<0.01). Produksi amonia dan produksi VFA yang dihasilkan dengan suplementasi proteinat, mineral proteinat, khitosan dan ekstrak rumput laut coklat dalam kondisi yang baik untuk pertumbuhan mikroba rumen. Hasil pengamatan terhadap karakteristik dan penampilan reproduksi menunjukkan bahwa suplementasi dengan proteinat (R2), mineral proteinat (R3), khitosan (R4) dan ekstrak rumput laut coklat dapat meningkatkan konsentrasi spermatozoa, persentase motilitas, persentase spermatozoa hidup dan penurunan persentase spermatozoa abnormal (p<0.01). Kesimpulannya adalah suplementasi proteinat, mineral proteinat, khitosan dan ekstrak rumput laut coklat dapat meredam toksisitas dari timbal serta menstimulasi produktivitas ternak ruminansia.
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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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