Judul: Profil Fenotipik Domba Garut dan Hasil Persilangannya
Abstrak: Penelitian ini bertujuan mengidentifikasi profil fenotipik sifat kualitatif hasil persilangan antara induk betina domba Garut dengan pejantan dari rumpun berbeda. Sampel domba yang digunakan dalam penelitian ini berjumlah 166 ekor dari rumpun domba berbeda. Penelitian dilakukan dengan mengamati sifat kualitatif domba yang terdiri dari; warna bulu, pola bulu, bentuk dan warna tanduk, bentuk telinga, bentuk ekor dan profil muka domba. Metode yang digunakan dalam penelitian ini adalah observasi langsung di lapangan yang dilanjutkan dengan analisis deskriptif dan perhitungan frekuensi relatif. Hasil penelitian menunjukkan warna bulu putih-hitam memperoleh nilai persentase tertinggi pada pejantan Garut (50%), pejantan Doper (100%), induk betina Garut (60,7%), dan beberapa tipe persilangan seperti; Batur x Garut pada jantan (63,6%), Dorper x Garut (64,2% dan 66,7%) dan Garut x Garut (57,8% dan 64,4%) di kedua jenis kelamin anaknya. Sifat tidak bertanduk mendominasi hasil persilangan domba, baik pada anakan jantan maupun betina. Sifat bentuk tanduk, bentuk telinga, dan bentuk ekor pada tipe hasil persilangan merupakan varian fenotip yang membedakan antara persilangan sesama domba Garut dengan persilangan Garut dengan rumpun pejantan berbeda (F1 Dorper, F1 Suffolk dan Batur)., This study aims to identify the phenotypic profile of qualitative traits crosses between ewes Garut and rams from different breeds. The number of samples used in this research was 166 sheep from differences in breed of sheep. Qualitative traits categories had seven indicators for this research, incorporated in fleece colour, fleece pattern, horn shape, ear shape, tail shape, facial profile, and horn colour. The method used in this research was direct observation and analysis by descriptive and account by frequency relatives. The result of research described that the combination of white and black colours earned the highest value on the Garut rams (50%), Dorper rams (100%), Garut ewes (60,7%), and several offsprings of crosses typical such Batur x Garut for male offspring, Dorper x Garut (64,2% and 66,7%) and Garut x Garut (57,8% and 64,4%) for both sex offspring male and female. The trait of polled dominated crosses typical of sheep for male and female offspring. The horn, ear, and tail type were different factors to reveal between Garut and their crosses (F1 Dorper, F1 Suffolk and Batur).
Keyword: crosses, sheep breeds, qualitative traits

Judul: Morphometric Index of Garut Sheep and Crossing Results
Abstrak: Indeks morfometrik merupakan salah satu alternatif untuk menilai jenis dan fungsi ternak. Penelitian ini bertujuan untuk memperoleh nilai morfometrik domba garut dan hasil persilangannya. Penelitian ini mengukur morfometrik 46 ekor domba garut dan hasil persilangannya. Peubah yang diukur adalah panjang badan, tinggi badan, tinggi pinggul, lingkar dada, dalam dada, lebar dada, lebar pinggul, panjang pinggul, dan bobot badan. Data yang diperoleh dianalisis secara deskriptif dengan menghitung rata-rata dan simpangan baku. Selanjutnya dihitung indeks morfometri dan diuji apakah terdapat perbedaan nyata antar morfometrik masingmasing persilangan dengan menggunakan uji t independen. Hasil penelitian ini menunjukkan tinggi badan dan tinggi pinggul domba pejantan garut lebih besar dibandingkan domba dorper dan batur. Ukuran tubuh anakan lepas sapih jantan dan betina tidak berbeda antara domba garut dan hasil persilangannya. Domba pejantan garut memiliki nilai height slope index dan foreleg length indeks lebih besar dibandingkan domba dorper dan batur. Ukuran indeks morfometrik domba anakan lepas sapih jantan garut lebih besar dibandingkan dengan hasil persilangannya terkait index weight, height slope indeks, dan foreleg length index., Morphometric index is one of the alternatives to assess the type and function of livestock. This study aims to obtain morphometric values of garut sheep and their crosses. This study measured the morphometrics of 46 garut sheep and their crosses. The measured variables were body length, body height, hip height, chest circumference, chest depth, chest width, hip width, hip length, and body weight. The data obtained were analyzed descriptively by calculating the mean and standard deviation. Furthermore, the morphometric index was calculated and tested whether there were significant differences between the morphometrics of each cross using the Independent T test. The results of this study showed that the body height and hip height of garut rams were greater than dorper and batur sheep. The body size of male and female weanlings did not differ between garut sheep and their crosses. garut rams have greater height slope index and foreleg length index values than dorper and batur sheep. The morphometric index size of garut male weaned lambs is greater than the results of their crosses related to index weight, height slope index, and foreleg length index.
Keyword: Domba Garut, indeks morfometrik, persilangan ternak, animal crossing, garut sheep, morphometric index

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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