Judul: Productivity of Young Cross Does at Over Two Kilograms of Liveweight.
Abstrak: An experiment was carried out to estimate the characteristics of production of young cross does that mated over 2 kg of liveweight, with the diifereat quantity of consentrate. The experiment had been done in Laboratory of Small Ruminant Faculty of Animal Husbandary, Bogor Agricultural University on March - August 2000. Eight young cross does with an average liveweight of 1.574,375 ± 113 g, were grouped into 2 different quantity of consentrate. The fist treatment (Rl) was given concentrate of 100 g/d/doe and 50 g/d/doe for the second treatment (R2). The mating was conducted when liveweight of rabbit gained over 2 kg and recorded as the mate weight. The obseived parameters including daily weight gain, mate weight, long of pregnancy, litter size, litter weight at buth and moitality at thee weeks. It was also studied the feed treatments toward daily dry feed intake, feed convertion, litter growth and physical condition of does. All data were explained by descriptive analysis. T-test statistical was used to learn correlation among mate weight, litter size, litter born weight and mortality at each treatments (Gaspersz, 1991).
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Judul: Penampilan Produksi Dan Reproduksi Calon Induk Domba Lokal (Jonggol) Yang Mendapat Ransum Dengan Sumber Energi Berbeda
Abstrak: Animal farming takes role in providing the animal protein, increasing the income of the farmers, job generating and preserving the nature resources. Sheep farming belongs to a common business for local farmers, although the productivity of Indonesian local sheep is very low which is drived by genetic and environment. The crucial factors are the low feed quality and the absence of production and reproduction targets. Flushing with high quality feed becomes a choice. This experiment was conducted to study the effect of different energy sources in ration on the performance of the local (Jonggol) young ewes. A total of 15 local (Jonggol) young ewes were used within the body weight average of 16.1±1.17 kg. All ewes were fed a ration with 40:60 for forage and concentrate, respectively. Nutrients composition was calculated according to iso-energy and iso-protein (66% TDN and 14% protein). Completely randomized design (CRD) was applied with 3 different treatments of energy source of feed in 5 replications. The energy sources used were maize (P1), tapioca by product (cassava) (P2) and mixture of maize and cassava (P3). The variables measured were the dry matter consumption before and after pregnancy, body weight gain before and after pregnancy, feed conversion, first estrus and successful mating, service per conception rate and number of pregnancies and fetus. The first estrus and successful mating, service per conception rate and number of pregnancy and fetus were descriptively analyzed. Other variables were subjected to analyses of variance (ANOVA) and Tukey to test the differences. The results showed that different energy feedstuff has no effect on the dry matter consumption before and after pregnancy, body weight gain before and after pregnancy, feed conversion, service per conception rate, and number of pregnancy and fetus. As conclusion, ration with different energy sources had not influence to the productive and reproductive performances of local (Jonggol) young ewes.
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Judul: Nanokristalin Pirit (FeS2) sebagai Material Semikonduktor Fotovoltaik.
Abstrak: Teknologi fotovoltaik adalah suatu proses yang dapat mengubah sinar matahari menjadi energi listrik dengan media semikonduktor. Penggunaan sel surya untuk fotovoltaik hanya dapat mengonversi radiasi matahari menjadi energi listrik kurang dari 20%. Efisiensi akan meningkat ketika material semikonduktor untuk fotovoltaik dibuat menjadi ukuran nano. Pirit merupakan salah satu material semikonduktor fotovoltaik yang memiliki energi pita celah (Eg) dalam kisaran 0.8–0.95 eV. Energi pita celah tersebut terbukti meningkat ketika disintesis dengan metode hidrotermal menggunakan beragam molar [S]:[Fe] pada suhu 200 °C dalam 24 jam. Nilai energi pita celah yang dihasilkan adalah 1.58–2.073 eV. Ukuran nanokristalin pirit yang dihasilkan berada pada kisaran 21.04–58.77 nm menurut data Particle Size Analyzer. Besarnya ukuran nanokristal pirit yang tumbuh kurang dari 50 nm merupakan poin penting untuk aplikasi fotovoltaik.
Keyword: Hidrotermal, fotovoltaik, nanokristal, pirit