Judul: Implementasi Inseminasi Buatan Pada Sapi Perah Di Koperasi Agro Niaga (KAN) Jabung Syariah Jawa Timur
Abstrak: Susu merupakan salah satu komoditi peternakan perah yang menjadi sumber protein andalan dan ekonomis. Peningkatan jumlah penduduk diikuti dengan peningkatan konsumsi susu. Namun, konsumsi susu belum diimbangi dengan peningkatan produksi susu dan populasi sapi perah. Inseminasi buatan dapat meningkatkan reproduksi ternak yang dapat meningkatkan populasi dan poduksi ternak. Dilakukan wawancara terhadap inseminator dan 96 responden terkait identitas responden dan manajemen reproduksi. Data yg dihasilkan menunjukkan bahwa peternak tergolong dalam usia produktif dengan pengalaman beternak yang cukup lama dan peternak sudah mengetahui tanda birahi pada sapi. Parameter keberhasilan Inseminasi Buatan yang digunakan adalah S/C, DO, dan CI. Nilai S/C pada tahun 2020-2022 sebesar 6,70; 4,75; 4,14. Nilai DO pada tahun 2020-2022 adalah 250,26 hari; 225,41 hari; dan 232,55 hari. Nilai CI pada tahun 2020-2022 adalah 17 bulan; 16,13 bulan; dan 16,44 bulan. Rendahnya pelaksanaan reproduksi disebabkan oleh manajemen pemberian pakan yang belum maksimal yang ditandai dengan masih tingginya kasus gangguan reproduksi yang masih tinggi. Perbaikan manajemen pemberian pakan dengan memperhatikan kualitas pakan dan pemberian mineral tambahan harus dilakukan., Milk is dairy farming commodities which is an economical and excellent source of protein. The increase in population will be followed by increase milk consumption. However, milk production and dairy cow population still very low. Artificial insemination can improve reproduction of dairy cattle which is can improve population and production of livestock. Interviews were conducted with inseminator and 96 respondents regarding the identity o the respondent and reproductive management. The resulting data showed that the farmer are of productive age with a long experience of dairy cattle. The result showed that t value of S/C in 2020-2022 is 6,70; 4,75; and 4,14. DO value in 2020-2022 is 250,26 days; 225,41 days, and 232,55 days. CI value in 2020-2022 is 17;16,13;and 16,44 month. One of the reason for low implementation of reproduction is the high of cases in reproductive disorder that are still high. Improvements in feeding management by taking into account the quality of feed and the provision of additional minerals must be carried out.
Keyword: dairy cattle, days open, calving interval, service per conception

Judul: Most Probable Producing Ability Sifat Produksi dan Reproduksi Sapi Perah di Koperasi Agro Niaga Jabung
Abstrak: Produktivitas seekor sapi ditentukan oleh produksi susu, lama masa laktasi, lama kering, days open, selang waktu antara partus dengan kawin pertama setelah beranak, service per conception, dan calving interval. Pendugaan ripitabilitas sifat produksi sapi perah dapat digunakan untuk mengestimasi produksi susu periode berikutnya dengan menggunakan metode MPPA (Most Probable Producing Ability) yang merupakan pengestimasian produksi susu sapi pada periode berikutnya berdasarkan catatan produksi sebelumnya. Materi yang digunakan dalam penelitian ini adalah data sekunder sapi Friesian Holstein sebanyak 124 ekor induk betina, meliputi produksi susu, lama laktasi, lama kering, kawin pertama setelah beranak, masa kosong, service per conception, dan calving interval. Pengumpulan data reproduksi dilakukan dengan kunjungan ke peternakan sapi perah di enam desa dalam Kecamatan Jabung. Data produksi susu dari tahun 2015-2020 didapatkan dari Koperasi Agro Niaga Jabung. Nilai MPPA yang telah didapat dibandingkan dengan data produksi susu laktasi ke-3 dengan menggunakan uji-T. Produksi susu yang sudah dikoreksi berdasarkan produksi 305 hari, lama laktasi, lama kering, days open, dan calving interval hasil estimasi berdasarkan MPPA sesuai dengan nilai yang sebenarnya pada laktasi 3, sedangkan prediksi kawin pertama setelah beranak dan service per conception berdasarkan MPPA nilainya berbeda dengan nilai yang sebenarnya pada laktasi ketiga. Hasil penelitian ini menunjukan bahwa MPPA dapat digunakan untuk memprediksi produksi susu terkoreksi 305 hari, lama laktasi, lama kering, days open, dan calving interval., The cow productivity is determined by milk production, lactation length, dry period, days open, postpartum mating, service per conception, and calving interval. Estimating the repeatability of production traits can be used to estimate milk production in the next period using the MPPA (Most Probable Producing Ability) method, which estimates cow's milk production in the next period on previous production records. The material used in this study is secondary data of 124 Friesian Holstein cows, including milk production, lactation length, dry period, days open, postpartum mating, service per conception, and calving interval. The collection of reproductive data was carried out by visiting dairy farms in six villages in Jabung District. Milk production data from 2015-2020 is obtained from the Jabung Agro Niaga Cooperative. The MPPA value that has been obtained was compared with the 3rd lactated milk production data using the T-test. The MPPA estimates of corrected milk production based on 305 days, lactation length, dry period, days open, and calving interval correspond to the actual value at 3rd lactation. In comparison, postpartum mating and service per conception based on MPPA is different from actual value at third lactation. The results of this study indicate that MPPA can be used to predict the 305-day corrected milk production, lactation length, dry period, days open, and calving interval.
Keyword: milk production, most probable producing ability, repeatability, reproduction

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: