Judul: Hubungan antara umur kebuntingan dengan jenis kelamin fetus pada sapi Friesian Holstein (FH) : Studi kasus di KPBS Pangalengan, Jawa Barat
Abstrak: Length or period of gestation is accounted starting from the last insemination until the birth of the calf. By knowing the period of gestation a farmer can prepare a birthplace, time for the dry period and the farmer can make a good, efficient, and profitable farm management. The purpose of this case study is to investigate whether the period of gestation is affected by the sex of the fetus. The case study was using FH cows as many as 441 cows which consist of 381 cows were from lactation dam and 60 cows were from dara dam. Data collection was conducted by sensus and interview. Collection of data was consist of names of the cow and farmers, dates and number of insemination, dates of birth, sex of the calf and number of calves. Data analysis was conducted by variance test (Tukey test) and correlation test. The result showed that statisticaly period of gestation vias not affected by the sex of the fetus (p > 0.05) and there was a weak relationship between the sex of the fetus with period of gestation (r=-0.0017), eventhough there was a difference in length of gestation where the average of period of gestation on the male calves were 0.66 days (15.84 hours) longer than the female calves. These were caused, possibility, by various factors that affected period of gestation genetic of the dam and fetus, number of fetus, nutrition, temperatur and hormones. Percentage of normal birth was higher (65.5%) compared to the early birth and the late birth.
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Judul: Efisiensi Reproduksi Sapi Perah Friesian Holstein yang Mengalami Retensi Plasenta di KPBS Pangalengan
Abstrak: Seekor induk diharapkan sapi perah dapat melahirkan anak setiap tahunnya. Namun demikian masih banyak ditemukan berbagai gangguan reproduksi yang menyebabkan rendahnya efisiensi reproduksi salah satu diantaranya adalah kejadian retensi plasenta. Retensi plasenta terjadi karena vili kotiledon fetus masih bertaut dengan kripta karunkula induk dan gagal melepaskan diri antara keduanya. Gangguan reproduksi akan berdampak pada fertilitas, sehingga waktu yang dibutuhkan untuk bereproduksi akan bertambah panjang yang menurunkan efisiensi reproduksi menurun. Penelitian ini dilakukan untuk mengamati pengaruh kejadian retensi plasenta terhadap efisiensi reproduksi pada sapi perah di KPBS Pangalengan, Metode yang digunakan adalah Analisa data sekunder yang diperoleh dari Koperasi Peternakan Bandung Selatan. Analisis data dilakukan secara deskriptif, menggunakan independent t test, dan Mann Whitney U dari aplikasi IBM SPSS Statistics 25.0. Penelitian ini menggunakan 190 data kelahiran yang dibagi menjadi dua kelompok berdasarkan kondisi kelahiran normal dan disertai retensi plasenta. Hasil penelitian menunjukkan jarak lahir ke inseminasi pertama pada kelompok retensi plasenta lebih lama 38.53 hari dibanding kelompok normal (P< 0.05). Sementara itu days open pada kelompok retensi plasenta lebih lama sekitar 38.07 hari dibanding kelompok normal (P< 0.05). Sebagai dampaknya calving interval pada kelompok retensi plasenta lebih lama 48.42 hari dibanding kelompok normal (P< 0.05). Disimpulkan bahwa retensi plasenta menurunkan efisiensi reproduksi dengan cara memperpanjang jarak lahir ke inseminasi pertama, days open, dan calving interval.
Keyword: Calving interval, efisiensi, fertilita, reproduksi, dan retensi plasenta

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4