Judul: Kecernaan Serat Pakan Pada Domba Garut Betina Yang Mendapat Ransum Dengan Nilai Nisbah Kation Anion Dan Kromium Berbeda
Abstrak: The experiment was aimed at evaluating dry matter intake and nutrient digestibility in Garut breed ewes offered ration differing in dietary cation anion ratio and supplemented with organic chromium (Cr) from Ganoderma lucidum. Twenty four female Garut breed sheep aged two years with initial weight of 27.70 ± 2.24 kg were alocated into a Randomized Block Design. The sheep were grouped into 4 weight groups based on their initial weight and allocated into six experimental rations. The experimental rations were: 1) RA = basal diet, 2) RB = basal diet + 3 ppm inorganic cromium, 3) RC = basal diet + 3 ppm organic Cr from rice straw, 4) RD = basal diet + 3 ppm organic Cr from oil palm by fiber, 5) RE = basal diet with DCAB –10 +3 ppm organic Cr from rice straw and 6) RF = basal diet with DCAB –10 + 3 ppm organic Cr from oil palm fiber. There were no effect of dietary cation anion ratio and organic Cr supplementation on dry matter intake, palatability, daily gain and nutrient digestibility. The result indicated that manipulation of dietary anion cation balance and supplementation of Cr at those levels were had no effect on palatability of feed, dry matter intakes, weight gain and nutrient digestibility. Keywords: anion, cation, chromium, digestibility, fiber, Garut sheep
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Judul: Kondisi Fisiologis Domba Garut Jantan yang Mendapat Ransum dengan Kadar Kromium dan Kation-Anion Berbeda pada Suhu Lingkungan Panas
Abstrak: Chromium (Cr) is an essential mineral for the animal body and required for normal metabolism of carbohydrate, protein, lipid and nucleic acid, hormonal regulation and immune function. Degradation of Cr level in sheep body increases stressor hormone that decreases health status of the animals. The objective of this experiment was to study the efficacy of chromium and dietary cation anion balance (DCAB) to improve physiological condition of sheep in high environment temperature. Twenty four of sheep were grouped in six weight categories and allocated into four dietary treatments. Dietary treatments were: R0= basal diet DCAB +14, R1= basal diet with 3 ppm organic-Cr, R2= DCAB 0 without organic-Cr, R3= DCAB 0 with 3 ppm organic-Cr. The basal diet composed of 35% maize straw and 65% concentrate. Diet and water were offered ad libitum. Rectal temperature, respiration rate, and bloods profile were observed. Rectal temperature, respiration rate, and bloods profile were not influenced by organic-Cr supplementation and manipulation of dietary cation anion balance. Result of environmental temperature 33 OC and humidity 68 % is rectal temperature (38.70-39.14 OC), respiration rate increases (8- 15 %), and stress indicated in all of sheep from netrofil/limfosit ratio 2-3. It was concluded that the supplementation of organic-Cr and manipulation of DCAB is not influence when the environmental temperature varied from 24-33 OC.
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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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