Judul: Selection of Kebumen Ongole Breed Sire Based on Breeding Value in Kebumen District
Abstrak: Salah satu faktor penentu kualitas suatu ternak adalah kualitas genetiknya. Kualitas genetik tidak dapat dihitung secara langsung, melainkan harus diestimasi dengan parameter genetik. Penelitian ini bertujuan mengestimasi nilai pemuliaan berdasarkan bobot dan ukuran-ukuran tubuh pedet saat lahir. Penelitian ini menggunakan 658 data kelahiran dari 38 pejantan sapi PO kebumen yaitu bobot lahir (BL), lingkar dada (LD), tinggi pundak (TP), dan panjang badan (PB). Data sekunder didapatkan dari data rekording milik KTT Perpokeb di Kabupaten Kebumen. Data dianalisis menggunakan metode korelasi saudara tiri sebapak. Rata-rata BL, LD, TP, dan PB sapi PO kebumen secara berurutan sebesar 32,17±3,72 kg; 69,76±7,24 cm; 73,68±6,44 cm; 60,22±7,57 cm. Nilai heritabilitas BL, LD, TP, PB sapi PO kebumen termasuk dalam kategori tinggi. Nilai pemuliaan BL, LD, TP, PB sapi PO kebumen tertinggi secara berurutan sebesar 35,72 kg, 74,74 cm, 76,90 cm, dan 66,76 cm. BL dengan LD dan BL dengan TP berkorelasi positif, sedangkan BL berkorelasi negatif dengan PB. Pejantan yang paling konsisten berada pada 10 pejantan dengan nilai pemuliaan terbaik dari setiap parameter adalah GS J 0002 dan KS K 14 10055., The determining factor for the superiority of an animal is its genetic quality. Genetic value of beef cattle cannot be estimated directly, but is predicted using genetic parameters. This study aims to rank kebumen ongole sire based on their breeding values. This study used 658 birth record from 38 kebumen ongole sires, i.e birth weight (BW), chest circumference (CC), shoulder height (SH), and body length (BL). Secondary data were obtained from KTT Perpokeb recorded data in Kebumen District. Data were analyzed using paternal half sib method. The means of BW, CC, SH, and BL of kebumen ongole cattle were 32,17±0,15 kg; 69,76±0,28 cm; 73,68±0,25 cm; 60,22±0,30 cm, respectively. Heritability value of BW, CC, SH, and BL of kebumen ongole cattle was high. The highest breeding value of BW, CC, SH, and BL of kebumen ongole cattle was 35,72 kg, 74,74 cm, 76,90 cm, and 66,76 cm, respectively. BW was positively correlated with CC and SH, but negatively correlated with BL. The most consistent sire that included in the best ten candidates were GS J 0002 and KS K 14 10055.
Keyword: breeding value, genetic correlation, heritability, selection

Judul: The Relationship of Parent Frame Score with Calf Birth Weight and Calving Interval in Ongole Cattle (PO) Kebumen
Abstrak: Sapi PO Kebumen memiliki beberapa keunggulan dibandingkan dengan sapi potong lokal pada umumnya, antara lain kondisi tubuh lebih tinggi dan sifat reproduksi yang lebih baik. Tujuan dari penelitian ini adalah untuk mengetahui hubungan frame score induk dengan bobot lahir pedet dan calving interval. Materi yang digunakan yaitu data berpasangan dari 121 ekor induk PO Kebumen dengan pedetnya. Peubah yang diamati adalah frame score induk, bobot lahir pedet dan calving interval. Data dianalisis menggunakan analisis rank spearman (rs), korelasi pearson dan regresi. Hasil penelitian menunjukkan korelasi rank spearman frame score dengan bobot lahir pedet adalah 0.026 sedangkan frame score dengan calving interval adalah 0.095. Hasil korelasi pearson yang diperoleh adalah 0.000 untuk frame score dengan bobot lahir pedet dan 0.147 untuk frame score dengan calving interval. Nilai persamaan regresi frame score dengan bobot lahir pedet Y=31.693+0.000061X dan nilai regresi frame score dengan calving interval Y=413.467+8.524X. Disimpukan bahwa hubungan frame score induk tidak menentukan bobot lahir pedet dan calving interval., PO Kebumen cattle has several advantages compared to the local beef cattle, including a higher body condition and better reproductive traits. The aim of this study was to determine the relationship between the cattle frame score with calving birth weight and calving interval. This study used 121 paired data of PO Kebumen cattle with their calves. Cattle frame score, calving birth weight and calving interval variables was observed. The data were analyzed using rank spearman correlation, pearson correlation and regression. The result showed that the rank spearman correlation value (rs) between the frame score and calving birth weight was 0.026 and 0.095 for the correaltion between frame score and calving interval. ThePearson correlation results was 0.000 for the correlation between frame score and calving birth weight and 0.147 for the frame score with calving interval. The frame score regression equation with calf birth weight was Y=31.693+0.000061X and the frame score regression equation with the calving interval was Y=413.467+8.524X. It can be concluded that the frame score did not correlate with the calving birth weight and the calving interval.
Keyword: bobot lahir, calving interval, frame score, sapi PO kebumen

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.
Keyword: