Judul: Konsentrasi IgY Ayam D2 IPB pada Berbagai Intensitas Parasit Gastrointestinal
Abstrak: Native chickens are more likely to become domesticated livestock and industrial livestock that cannot be replaced by other types of chicken. IPB-D1 chickens are a new breed of native Indonesian chickens created by cross-breeding native chickens and broiler parent stock. The IPB D1 chicken has a high concentration of immunoglobulin IgY and resistance again Newcastle disease infection. IPB D2 chickens are a potential candidate for a new line of selection results from IPB D1 chickens for disease resistance and fast growth. Helminthiasis is a disease caused by helminth infection that causes health problems such as lose weight and production decrease. Helminthiasis can reduce the immune system, so it is necessary to research to determine the IgY concentration of IPB D2 chicken in chickens with various levels of helminth infection. The study aims to investigate the IgY infection in various helminth infections. Twenty-two chickens IPB D2 chicken 27-week-old were used for this research. The faecal and blood sample were collected. Observed data is obtained from blood and faecal sample. The Ig Y titer was measured by the ELISA method, and the presence of helminth was observed by McMaster and simple flotation technique. The result shows that the IgY concentration of IPB D2 chicken was 5.6-12.36 mg/mL, 65% of the chicken was categorized as a high titer of IgY, i.e., > 7.5 mg/mL and the rest (35%) categorized low titer (< 7,5mg/mL). The egg of nematode and cestode was found in the chicken. The genus that was found is Strongyloides, Trichuris and Capillaria. Other gastrointestinal parasites include oocytes and protozoa of the genus Eimeria. Chicken with a high IgY titer has higher infection than chicken with a low IgY. It is indicated that helminth infection induces antibodies by increasing the IgY titer
Keyword: Chicken, Helminth, Immunity, IPB D2 Chicken, Ig Y

Judul: Performance Production and Reproduction of IPB-D1 Chicken Different IgY Concentration
Abstrak: Ayam IPB-D1 merupakan hasil persilangan antara jantan F1 pelung-sentul dengan betina F1 kampung-broiler parent stock. Keunggulan yang dimiliki ayam IPB- D1 yaitu pertumbuhan yang cepat dan mencapai bobot potong (jantan 1,18 kg dan betina 1,04 kg) pada umur 10-12 minggu. Bobot badan rata-rata ayam IPB-D1 yang dipelihara dalam waktu 12 minggu yaitu sebesar 1514,57 kg/ekor, ayam IPB-D1 yang dipelihara selama 12 minggu memberikan bobot badan yang hampir sama dengan ayam broiler yang dipelihara selama 5 minggu. IgY adalah imunoglobulin yang tersedia dalam jumlah banyak ditemukan pada serum dan didepositkan ke dalam kuning telur. Tujuan dari penelitian ini adalah untuk mengevaluasi konsentrasi IgY yang berbeda terhadap performa produksi, reproduksi dan fisiologi pada ayam IPB-D1 betina, serta menganalisis konsentrasi IgY pada telur dan serum darah ayam yang berasal dari induk yang memiliki konsentrasi IgY yang berbeda. Penelitian ini menggunakan 20 ekor ayam IPB-D1 7 bulan, terdiri dari 10 ekor ayam IgY tinggi dan 10 ekor ayam IgY rendah. Pengujian total IgY serum dan kuning telur dilakukan dengan menggunakan metode Enzyme-linked immunosorbent assay (ELISA). Perhitungan kadar hemoglobin dengan prinsip fotometer (Photometer 5010) menggunakan kit komersial. Perhitungan jumlah eritrosit dan leukosit dilakukan secara manual menggunakan hemocytometer. Variabel yang diamati adalah performa produksi ayam IPB-D1, reproduksi (fertilitas, daya tetas, dan bobot DOC), dan fisiologi (jumlah sel darah merah, sel darah putih, leukosit dan deferensiasi leukosit). Hasil penelitian menunjukkan tidak ada perbedaan terhadap performa produksi (konsumsi pakan, pertambahan bobot badan, produksi telur) ayam IPB-D1 dengan konsentrasi IgY tinggi dan rendah. Hasil menujukkan adanya perbedaan performan produksi (berat telur) terhadap ayam IPB-D1 dengan konsentrasi IgY rendah dan IgY tinggi. Reproduksi ayam IPB-D1 (fertilitas, daya tetas, dan bobot DOC) menunjukkan bahwa ayam IPB-D1 konsentrasi IgY rendah hasilnya lebih tinggi dibandingkan dengan ayam IgY tinggi. Fisiologi ayam IPB-D1 (sel darah merah, sel darah putih, dan deferensiasi leukosit) yang normal. Penelitian ini menunjukkan bahwa dengan konsentrasi IgY yang tinggi dari IPB-D1 ayam mampu mengatasi paparan agen penyakit tetapi menurunkan produksi dan reproduksi.
Keyword: IPB-D1 chicken, IgY, Production, Reproduction, Serum

Judul: Numerical modeling of the hydrodynamics of standing wave and scouring in front of impermeable breakwater with different steepnesses
Abstrak: The aim of this paper is to numerically study the effects of breakwater steepness on the hydrodynamics of standing wave and scouring process in front of impermeable breakwaters. A two-dimensional hydrodynamics model based on the Reynolds Averaged Navier–Stokes (RANS) equations and the Volume of Fluid (VOF) method was developed and then combined with an empirical sediment transport model. Comparisons with an analytical solution and experimental data showed the present model is very accurate in predicting the near bottom velocity and capable of simulating the scour/deposition patterns consistent with experimental data. It was found that the additional terms of bottom shear stress in the momentum equations are necessary to produce a physical scouring pattern. Different breakwater steepnesses produce different characteristics of standing wave, the steady streaming system, and scouring pattern in front of the breakwaters, which also affects the correlations between them. An additional analysis of the turbulence field parameters and the sediment transport rate was also performed. All these important information will be presented in details in this paper and can be worthwhile for designing the breakwater in coastal areas.
Keyword: The RANS–VOF model Standingwave Steadystreamingsystem Scouring pattern Breakwatersteepness