Judul: Analisis Hubungan Efisiensi Reproduksi dengan Produktivitas Sapi Perah: Studi Kasus di KPBS Pangalengan, Jawa Barat
Abstrak: The aims of this study were to measure the reproductive efficiency and productivity of dairy cows and to analysis the correlation between them in KPBS Pangalengan, West Java in the year 2010 – 2012. This research used the secondary data in KPBS Pangalengan which consisted of artificial insemination and animal health records, calves births, milk production, distribution of dairy cow population, and characteristic of animal health personnel in the period of 2010 – 2012. The data was analysed descriptively and statistically to identify the correlation of S/C (service per conception) and CR% (conception rate) with milk production and calves births of dairy cows. The statistic analysis was performed using SPSS 16.0. Duncan range test is used to showed the difference between variables among regions. The results of this study showed the value of reproductive efficiency (S/C & CR%) and productivity (milk production and calves births) of dairy cows in KPBS Pangalengan were generally good. The best value of reproductive efficiency in region Los Cimaung II, the highest milk production were in region Cisangkuy, meanwhile the highest calves births was in region Padahurip. The study showed that there was a significant correlation (α=0.05) between S/C and milk production (r=˗0.562) and calves births (r=˗0.607), also between CR% and milk production (r=0.565) and calves births (r=0.642).
Keyword: S/C, milk production, KPBS Pangalengan, CR%, calves births

Judul: Status Kecernaan Pakan dan Produksi Susu Induk Sebagai Indikator Pertumbuhan Pedet pada Sapi Perah (Friesian Holstein) di KPBS Pangalengan
Abstrak: Status of feed digestibility, milk production, and growth in cow and calf are indicator of performance improvement milk production and cow population in the dairy farm area. Study about the relation between feed, digestibilility, and performance (milk production and growth of calf) in the dairy farm area have not much done. Pangalengan is a central of dairy farm that coordinate by KPBS. The purpose of this research is to know about status of feed digestibility, milk production, and growth of calf in public farm KPBS Pangalengan. Sixteen weaning cows were used for feed digestibility and milk production observation, also sixteen calfs were used for body weight observation. The observational data of the overall parameters was analyzed descriptively then statistically using analysis of variance (Anova) method. Status of feed digestibility and milk production of dairy cows in KPBS Pangalengan can be used as indicators of the growth calves. Percentage of feed digestibility which were dry matter 81.40%, crude protein 89.29%, crude fat 95.12%, crude fiber 63.54% and ash 77.34% show the feed digestibility was good. Milk production showed good quality in the first 8 weeks lactation which was 18.74 liter/cow/day. Growth of body weight in calf was 0.2 kg/calf/day. Based of these result, Dairy farm KPBS Pangalengan have good management for dairy cows that would keep the cows healthy and productive.
Keyword: Pangalengan., milk production, feed digestibility, calf, dairy cows

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