Judul: Diferensial Leukosit Sapi BX yang Diberi Imbuhan Pakan Daun Katuk Di PT. Great Giant Livestock
Abstrak: Daun katuk memiliki beberapa senyawa aktif yang dapat mempengaruhi kondisi fisiologis di dalam jaringan, khususnya pada darah. Gambaran darah sapi BX yang diberi imbuhan pakan daun katuk ini belum pernah dilaporkan, sehingga perlu dilakukan penelitian untuk mengetahui kondisi gambaran deferensial leukositnya. Sebanyak 9 sapi BX dibagi menjadi 3 kelompok yaitu kelompok kontrol (tanpa penambahan ekstrak bubuk dan pellet katuk), kelompok perlakuan 1 (dengan penambahan ekstrak bubuk katuk), dan kelompok perlakuan 2 (dengan penambahan ektrak pellet katuk). Pengambilan sampel darah dilakukan setelah pemberian perlakuan selama tiga bulan dan dilakukan melalui vena coccigea. Hasil penelitian menunjukkan bahwa sapi dari semua kelompok perlakuan dan kontrol memiliki jumlah leukosit yang tidak berbeda secara signifikan dan persentase leukosit dalam kisaran normal. Perlakuan penambahan pakan ekstrak katuk dalam bentuk pellet berpengaruh terhadap peningkatan persentase limfosit namun menurunkan jumlah neutrofil dibanding dengan sapi yang diberi ekstrak katuk dalam bentuk serbuk maupun kontrol tanpa perlakuan. Perlakuan penambahan pakan ekstrak katuk dalam bentuk bubuk meningkatkan persentase eosinofil namun tidak mempengaruhi jenis leukosit lainnya. Pemberian imbuhan pakan daun katuk tidak mempengaruhi jumlah leukosit namun mempengaruhi persentase leukosit yaitu limfosit, neutrofil, dan eosinosfil sedangkan persentase monosit dan basofil tidak terpengaruhi.
Keyword: katuk leaf, leukocyte, brahman cross

Judul: Total dan Diferensiasi Leukosit Sapi Pejantan Unggul dengan Body Condition Scoring (BCS) Tinggi
Abstrak: Bull were sperm producer for artificial insemination. Physiological data such as leukocytes differentiation were important for supporting routine health monitoring. The objective of this study is to get the profile of leukocytes from high-level body condition scoring (BCS) of bull. The 30 blood samples of 3 breed bull (Simmental, Brahman, Friesian Holstein) were collected through coxygeal vein and calculated using microscope eye-piece camera instrument. The results showed that bull in A group (age <5 years) had higher total leukocytes than bull in B group (age >5 years). Average value of total leukocytes, eosinophil, neutrophil, basophil, lymphocyte, and monocyte of bull in A group were 7764 cell/μL, 411 cell/μL, 4150 cell/μL, 109 cell/μL, 2892 cell/μL, and 204 cell/μL consecutively. While the average value of total leukocytes, eosinophil, neutrophil, basophil, lymphocyte, and monocyte of bull in B group were 6832 cell/μL, 437 cell/μL, 3771 cell/μL, 71 cell/μL, 2363 cell/μL, and 192 cell/μL consecutively. Leukocytes morphology between breed and ages also shown the similar shape.
Keyword: Bogor Agricultural University (IPB), high-level bcs, leukocyte differentiation, bull

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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