Judul: Performa Reproduksi dan Produksi Daughter Cow (DC) Sapi Perah Friesian Holstein (FH) Hasil Uji Zuriat
Abstrak: Uji Zuriat merupakan salah satu Upaya percepatan produksi bibit untuk menghasilkan bibit pejantan unggul (provenbulls) yang dapat beradaptasi dengan kondisi dan agrokilmat di Indonesia. Uji zuriat merupakan metode yang dilakukan untuk mengevaluasi mutu genetik calon pejantan unggul (CPU) berdasarkan produksi susu anak betinanya (daughter cow/DC). Untuk menghasilkan calon pejantan unggul (CPU) dengan potensi genetik yang dapat diwariskan, dapat dilihat dari performa anak betinanya (daughter cow/DC). Keragaman kondisi wilayah agroklimat merupakan salah satu faktor yang dapat mempengaruhi performa DC. Calon pejantan diseleksi berdasarkan performa DC. Penelitian bertujuan untuk mengevaluasi performa reproduksi dan produksi Daughter Cow (DC) sapi perah Friesian Holstein (FH) hasil uji zuriat. Penelitian menggunakan pencatatan 636 ekor DC uji zuriat periode III tahun 2017-2020 dari 6 (enam) Calon Pejantan Unggul (CPU) yang terdistribusi semen bekunya di 4 (empat) provinsi yaitu Jawa Timur, Jawa Tengah, Jawa Barat dan Daerah Istimewa Yogyakarta. Performa reproduksi DC yang diamati adalah angka kelahiran, sex ratio, umur kawin pertama, Service per Conception (S/C), lama bunting dan umur beranak pertama. Performa produksi susu yang diamati mencakup produksi susu harian, produksi susu total dan lama laktasi. Hasil penelitian menunjukkan bahwa performa reproduksi DC memiliki kualitas yang baik dengan rataan angka kelahiran sebesar 77,48%; Sex ratio yang dihasilkan lebih banyak jenis kelamin jantan sebesar 55,62% dan betina 44,38%; rataan umur kawin pertama sebesar 18,13 ± 4,38 bulan; rataan Service per Conception (S/C) sebesar 1,30 ± 0,63 kali; rataan lama bunting yaitu 275 ± 16 hari dan rataan umur beranak pertama sebesar 28,00 ± 4,63 bulan. Performa produksi susu DC menunjukkan rataan produksi susu harian sebesar 13,71 ± 3,92 kg; rataan produksi susu total sebesar 5.227,15 ± 1.466,10 kg dan rataan lama laktasi yang tercatat adalah 249,94 ± 82,80 hari. Hasil penelitian menyimpulkan rataan performa DC sangat baik, sehingga CPU dapat digunakan sebagai pejantan unggul dalam pengembangan sapi perah di Indonesia.
Keyword: uji zuriat, friesian holstein, daughter cow, produksi susu

Judul: Kualitas Participated Cow untuk Menentukan Calon Pejantan Unggul berdasarkan Produksi Susu Daughter Cow di Jawa Timur
Abstrak: Optimal milk production of Daughter Cows (DC) is not only determined by the quality of Candidate Bulls (CB), but also by the Participated Cows (PC). The diversity of PC quality is one of the factors that can affect the milk production of DC. Improper operational standards can lead to the selection of less-than-optimal PC as dams. This study aims to analyze the superiority of PC’s quality based on DC milk production and evaluate the superiority of CB. This study uses secondary data from the third period of progeny test in 2017-2020. The PC parameters observed included birth rate, sex ratio, lactation period, and milk production. The CB parameters include volume, semen dosage, sperm quality, and concentration. The DC parameter only includes milk production. The data were analyzed using descriptive analysis through the excel program. The results showed that the quality of semen on the CB at NAIC Singosari has a good quality an average pH value of 6,46±0,17, an average semen volume of 7,15±1,87 mL, an average mass movement of 2,26±0,43, an average individual motility of 73,45±0,06%, an average concentration of 1012,25±287,29 million/mL, and frozen semen production of 295,57±123,03 straws. The quality of PC shows a high birth rate of 97,22% with lactation period 1, 2, and 3 respectively at 48.27%, 40,79%, and 10,94%. The sex ratio produced is 53% female and 47% male. The milk production of PC is 13,77 kg/head/day and the milk production of DC is 14,24 kg/head/day. It was concluded, that the milk production of DC is higher than the milk production of PC. The seven CBs based on DC milk production from the highest order are Aris, Flate, Flanggo, Glens, Doming, Folegan, and Shoty. Candidate bulls in the third period of progeny test are suitable to be launched as proven bull and their frozen semen is suitable for distribution for the development of the national dairy cattle.
Keyword: friesian holstein, milk production, progeny test, semen characteristics

Judul: Pengembangan Sistem Rotasi Peta pada Perangkat Mobile tanpa Sensor Magnetometer
Abstrak: Due to the improvement of technology, the function of mobile phone has changed a lot. Nowadays, mobile phone is used not only for communication, but also to support the user’s activity. Many mobile phones now have Operating System (OS) and sensors like GPS and magnetometer. GPS is a sensor that can be used to identify any location, including the location of the user, while magnetometer can be used to identify direction. With data that come from GPS and magnetometer, we can build a navigation application that can rotate its map according to the rotation of the user. Meanwhile, in the Android Compability Definition Document point 1.6 until 2.2, Google have requirements for mobile phones to have GPS and magnetometer sensors if they want to use Android OS. But, since the release of 2.3.3 OS, Google has changed its requirements, allowing any mobile phones to have Android OS without having the magnetometer sensor. The objective of this research is to build an navigation application that can rotate without using magnetometer sensor. The value of the rotation degree is taken from last two position. To stabilize the value, Exponential Smoothing is used in filtering process. This system also use Haversine method to recognize whether the user is walking or driving/riding.
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