Judul: Studi substitusi taraf zeolit dengan ukuran berbeda dalam ransum komersial terhadap performans ayam pedaging
Abstrak: Penelitian ini dilakukan di Laboratorium Ternak Unggas, Jurusan Produksi Ternak Fakultas Peternakan, Institut Pertanian Bogor selama enam minggu sejak 11 Juni sampai dengan 4 Agustus 1993. Tujuan penelitian adalah untuk mempelajari tingkat substitusi zeolit dengan ukuran partikel berbeda dalam ransum komersial terhadap performans ayam pedaging. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap pola Faktorial 3 x 3 dengan tiga ulangan. Faktor perlakuan pertama dalam ransum yang terdiri dari tiga taraf zeolit yaitu 2%, 4% dan 6% dan faktor kedua adalah ukuran partikel zeolit yang terdiri dari tiga ukuran pula yaitu 80-100 mesh (halus), 30-65 mesh (sedang) dan 18 mesh (kasar). Setiap perlakuan menggunakan 10 ekor ternak sebagai satu unit percobaan, sehingga jumlah ayam (DOC) yang digunakan sebanyak 270 ekor...dst
Keyword: Chickens feeding, Zeolit, Lemak abdomen, Karkas, Ransum

Judul: Studi substitusi ransum komersial dengan zeolit terhadap penampilan produksi ayam petelur tipe medium fase produksi II
Abstrak: Penelitian ini dilaksanakan selama dua bulan yang dimulai pada tanggal 20 Mei sampai 19 Juli 1992 di perusa- haan Peternakan Ayam Petelur Dharmadi Farm, Curug, Tange- rang. Tujuan penelitian ini ialah untuk mengetahui pengaruh substitusi ransum komersial dengan zeolit terhadap penam- pilan produksi ayam petelur. Pada Penelitian ini digunakan 120 ekor ayam petelur galur ISA Brown umur 56 minggu yang dipelihara dalam kandang dengan sistem sangkar. Ransum yang digunakan merupakan ransum komersial. Zeolit yang digunakan merupa- kan zeolit alam dengan ukuran 150 mesh. Taraf pemakaian zeolit dalam ransum terbagi dalam lima ransum perlakuan yaitu Ro. (0% zeolit), R₁ (2% zeolit), R2 (4% zeolit), R3 (6% zeolit) dan R4 (8% zeolit). Dalam penelitian ini digunakan Rancangan Acak Lengkap (RAL) dengan lima perlakuan dan empat ulangan. Untuk mengetahui pengaruh perlakuan digunakan analisis sidik ragam dan dilanjutkan dengan uji jarak Duncan untuk menge- tahui pengaruh antar perlakuan. Peubah yang diamati adalah konsumsi ransum, produksi telur, konversi ransum dan berat telur total serta Income over feed cost. Hasil analisis sidik ragam menunjukkan bahwa substi- tusi zeolit dalam ransum berpengaruh sangat nyata (P<0.01) menurunkan tingkat konsumsi ransum dan angka konversi ransum, tetapi tidak berpengaruh nyata meningkatkan berat telur total dan produksi telur harian (hen day production). Namun demikian produksi telur (hen day) dan berat telur total yang tertinggi dicapai oleh perlakuan zeolit 8% sebesar 78,08% dan 2912,15 g/ekor, Hasil uji jarak Duncan menunjukkan bahwa rataan konsumsi ransum per ekor selama dua bulan penelitian, perlakuan zeolit 8% (6327,60 g), 6% (6374,10 g), 4% (6446,25 g) berbeda sangat nyata (P<0.01) dibandingkan dengan perlakuan 0% zeolit (6814,95 g)....
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Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite