Judul: Persentase Kelahiran Anak Betina Sapi Friesian Holstein di BBPTU Sapi Perah Baturraden Jawa Tengah
Abstrak: Penelitian dilakukan untuk mengevaluasi persentase kelahiran pedet betina sapi perah Friesian Holstein (FH) pada setiap periode kelahiran, bulan kelahiran dan musim kelahiran yang terjadi di daerah BBPTU Baturraden, Jawa Tengah. Metode pengumpulan data berdasarkan survey. Jumlah sampel pedet sapi perah FH di BBPTU Baturraden adalah 2 028 ekor. Data ditabulasi berdasarkan jenis kelamin pedet sapi FH yang dilahirkan. Data diperoleh dari tahun 1985-2005. Peubah yang diamati pada penelitian ini yaitu rasio kelahiran pedet berdasarkan periode, rasio kelahiran pedet berdasarkan bulan, dan rasio kelahiran pedet berdasarkan musim. Data dianalisis deskriptif. Hasil penelitian menunjukkan bahwa periode tertinggi adalah pedet jantan untuk periode ke-1 hingga periode ke- 5 dengan persentase 51.29%-57.41%, pedet betina untuk periode ke-6 dan ke-7 dengan persentase 56%-61.90% dan pedet jantan untuk periode ke-8 hingga periode ke-10 dengan persentase 59.89%-100%. Kelahiran pedet berdasarkan bulan kelahiran tertinggi pada bulan November adalah pedet betina dengan persentase 54.34%, sedangkan pedet jantan tertinggi pada bulan Januari yaitu sebesar 60.43%. Kelahiran pedet jantan berdasarkan musim kemarau yaitu sebesar 51.91%, sedangkan pada musim hujan kelahiran pedet jantan pun lebih tinggi yaitu sebesar 52.27%. Kesimpulan menunjukkan bahwa kelahiran tertinggi, baik berdasarkan periode kelahiran, bulan kelahiran dan musim kelahiran di BBPTU Baturaden adalah pedet jantan.
Keyword: female calf birth, friesian holstein, sex ratio, Dairy cow calf, FH born calf, Calves ratio, Descriptive analysis, Higest birth

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: 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