Judul: Tingkat Prevalensi dan Derajat Infeksi Cacing Saluran Pencernaan pada Sapi Perah di Kecamatan Pangalengan Kabupaten Bandung
Abstrak: The objective of this study was to determine the prevalence and intensity of gastrointestinal helminth infections on the dairy cattle in Kecamatan Pangalengan, Kabupaten Bandung. Fecal samples were collected from 120 cows in 3 Komda and examined with Mc Master and sedimentation filtration modification method to detect the presence of worm eggs and determine the numbers of egg per gram of feces (EPG). Risk factors associated with farm management were obtained by questionnaires through direct interviews with farmers. The results showed that of the 120 examined fecal samples, as many as 34 of fecal samples were positive (28.3%) infected with nematode. There were 30 samples (25%) positive to Strongyle, and 4 samples (3.3%) positive to Trichuris spp. The EPG Strongyle was 106.63±105.65 and EPG Trichuris spp. was 105±95.74 which was catagorized as ligth infection. The highest prevalence of Strongyle infection was seen in the age group <6 months (50%), whereas the highest prevalence Trichuris spp. was seen in the age group 6-12 months (12.5%). Based on location, the highest Strongyle prevalence was found in Komda Mekar Mulya (27.5%), and the highest Trichuris spp. prevalence was found in Komda Padahurip (7.5%).
Keyword: Bogor Agricultural University (IPB), Trichuris spp., Strongyle, Intensity of Infection, Prevalence

Judul: Pendugaan Prevalensi dan Faktor Risiko Koksidiosis pada Sapi Perah di Kabupaten Bandung
Abstrak: Bovine coccidiosis is one of the most widely distributed parasitic diseases of cattle throughout the world, and its infection of ruminants caused by Eimeria spp. Bandung district has highland areas and cooler climate, so that, in southern part of Bandung district becomes as a dairy farm center area which called Cooperation of South Bandung Dairy Farm (KPBS) Pangalengan. Dairy cattle is one of farming comodity which has high susceptibility to coccidiosis infection due to stress condition and poor sanitation causing great economical losses include reduced milk production. This study was conducted with a cross-sectional study design in dairy cattle of Bandung district from July, 2014 to January, 2015 which aimed to determine the prevalence, species composition, and associated risk factors with coccidiosis. Another aim of the study was to evaluate various factors such as: sex, age of the cattle and type of pen flooring influencing the number of Eimeria oocysts shedding in dairy farm. Samples were obtained from 400 dairy cattle (196, 37 and 167 for aged less than 6 months, 6-12 months and more than 12 months, respectively). Fecal samples were collected, examined and counted for prevalence, species composition and number of oocysts per gram of feces (OPG) to determine for Eimeria by McMaster technique. A questionnaire was completed for individual dairy cattle to record information about animal health and husbandry. OPG counts presented asymmetrical distribution and for this reason, the data were analyzed using a Mann-Whitney test for explanatory variable with 2 categorical factors and a Kruskal-Wallis test for explanatory variable with more than 2 categorical factors followed by Dunn test as a multiple comparison test. Meanwhile, associated factors with risk of Eimeria infection were performed by chi-square test and multivariate logistic regression models. Overall prevalence and mean of oocysts number of Eimeria in cattle was 179 (44.8%; Confidence Interval (CI) 95%: 40.0%-49.6%) and 286.8 opg (oocysts per gram of feces) (CI 95%: 135.7-437.8) respectively, while highest prevalence of Eimeria (67.3%; CI 95%: 60.8-73.9) was observed in calves aged less than 6 months. Ten species of Eimeria were identified in total infected cattle. Among the identified species of Eimeria, E. bovis was found to be highest prevalent species (42.5%), followed in order by E. wyomingensis, E. bukidnonensis, E. pellita, E. auburnensis, E. zuernii, E. cylindrica, E. canadensis, E. brasiliensis and E. alabamensis with prevalence of 39.1%, 32.4%, 26.3%, 19.6%, 17.3%, 3.9%, 3.9%, 3.4% and 1.1% respectively. Sex, age of the cattle and type of pen flooring have significantly effect (P<0.05) with the number of oocysts shed. Younger calves aged less than 6 months shed highest amounts of oocysts than older cattle. Coccidiosis prevalence in cattle aged more than 12 months had lower statistically significant difference (P<0.05) to calves aged less than 6 months and aged 6-12 months. The presence of an immature immune system in younger calves resulting in their higher susceptibility to coccidiosis. Among management and animal health practices, only floor type which had significantly association with the prevalence of Eimeria in cattle.
Keyword: coccidiosis, cross-sectional, dairy cattle, Eimeria, prevalence

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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