Judul: Improving Rice Straw Feeding with Supplementation Technology on Performance of Female Peranakan Ongole (PO) Cattles in Rembang Regency
Abstrak: Beef cattle fattening and breeding are the main programs done by people in Rembang Regency in the Province of Middle Java. Peranakan Ongole (PO) cattle is a local beef cattle that is usually kept by people in Rembang Regency. Rice straw and rice bran are usually used as feeds by the farmers, especially during dry season. Supplementation to this kind of diet is aimed at increasing the female PO cattle performance. Therefore, the objective of this experiment is to study the effect of rice straw supplementation on production performance. This experiment was conducted in Rembang Regency for 40 days using 16 female PO cattles with 4 treatments and 4 blocks. Treatments were R1 = 100% rice straw, R2 = R1 + 2 kg rice bran, R3 = R2 + 0.4 kg nutrient enriched supplement (SKN) and R4 = complete ration consisting of rice straw, rice bran and SKN. The variables observed were dry matter intake, average daily gain and body size measurements with its average daily growths (body length, chest girth, wither height, chest width and chest depth). All data were collected and analyzed by analysis of variance with randomized block design. The results of this study showed that rice straw supplementation affected dry matter intake (P<0.01) and chest girth (P<0.05), but did not affect (P>0.05) significantly average daily gain, body length, wither height, chest width, chest depth and average daily growths of body size measurements (body length, chest girth, wither height, chest width and chest depth).
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Judul: Performance Peranakan Ongole (PO) Heifer with Concentrate and Fermented Feed during the Reconditioning Period
Abstrak: Performa sapi dara menjadi hal penting untuk menunjang produktifitasnya. Penelitian bertujuan untuk mengkaji pengaruh pemberian kombinasi sorinfer sebagai substitusi sebagian konsentrat terhadap performa produksi sapi dara Peranakan Ongole (PO) selama periode rekondisi. Sapi yang digunakan pada penelitia ini yaitu sapi dara PO berumur 1−2 tahun (I0−I1) sebanyak 12 ekor dengan rataan bobot awal 177,17±20,35 kg. Penelitian ini menggunakan 3 perlakuan ransum yaitu konsentrat yang dikombinasikan sorinfer dan jerami. Rasio konsentrat, sorinfer, dan jerami adalah 50:20:30 (R1), 35:35:30 (R2), dan 20:50:30 (R3). Peubah yang diamati diantaranya suhu dan kelembapan lingkungan, Temperature Humidity Index (THI), konsumsi ransum as feed, konsumsi BK, konsumsi PK, konsumsi TDN, konversi ransum as feed, konversi BK, Pertambahan Bobot Badan (PBB), bobot akhir, dan feed cost per gain (FCG). Data dianalisis sidik peragam (ANCOVA), kemudian diuji dengan Least Square Mean menggunakan Statistical Analysis Software (SAS). Hasil penelitian menunjukkan konsumsi ransum as feed perlakuan R3 nyata lebih tinggi (P<0,05) dibandingkan dengan perlakuan lainnya. Konversi ransum as feed dan FCG untuk ketiga perlakuan tidak berbeda secara nyata. PBB perlakuan R2 dan R3 nyata lebih tinggi dibandingkan perlakuan lainnya (P<0,05). Perlakuan R2 dan R3 menghasilkan rekondisi sapi dara terbaik berdasarkan konsumsi as feed, konsumsi BK, konsumsi PK, konsumsi TDN, PBB, dan bobot akhir., The performance of heifers is important to support their productvity. The purpose of this study isto examine the effect of partial substitution of concentrate feed with sorinfer silage on the production performance of peranakan ongole (PO) heifer during the reconditioning period. The experiment used 12 heads of PO heifers aging 1−2 years (I0−I1) with an initial liveweight of 177,17±20,35 kg. This experiment used 3 ration treatments, namely combination concentrate, sorinfer silage, and hay with a ratio of 50:20:30 (R1), 35:35:30 (R2), and 20:50:30 (R3). The observed parameters included ambient temperature and humidity, Temperature Humidity Index (THI), feed consumption, feed conversion, daily body weight gain, final live weight, and feed cost per kg live weight gain (FCG). The data were analyzed by analysis of covariance (ANCOVA) and between treatments differences were tested using least Square Means (LS Means) method. The results showed that the R3 consumption as fed was significantly higher (P<0,05) compared to the other two feed treatments. Feed conversions and FCG were not significantly different among treatments. Body weight gain of R2 and R3 treatments were significantly higher compared to R1 treatment (P<0,05). The R2 and R3 treatments gave the best results for reconditioning heifers based on as feed consumption, dry matter feed consumption, PK consumption TDN consumption, live weight gain, and final live weight.
Keyword: performance production, PO heifer, sorinfer, recondition

Judul: Formulasi Hamilton Untuk Menggambarkan Deformasi Gelombang Soliter Dengan Dasar Tidak Rata Pada Fluida Dua Lapisan
Abstrak: Gelombang internal adalah suatu gelombang yang muncul di bawah permukaan laut sehingga gelombang ini tidak teramati secara kasat mata. Formulasi Hamilton dirumuskan untuk menjelaskan gerak gelombang ini. Dalam hal ini diasumsikan bahwa fluida yang ditinjau terdiri atas dua lapisan dengan masing-masing lapisan memiliki rapat massa yang konstan. Selain itu, diasumsikan pula fluida yang ditinjau berupa fluida tak mampat (incompressible) dan tak kental (invicid). Formulasi Hamilton dilakukan dengan meninjau fluida dua lapisan yang berada pada domain yang dibatasi oleh batas atas yang rata dan batas bawah yang tidak rata. Hamilton (energi total)-nya didefinisikan sebagai penjumlahan antara energi kinetik dan energi potensialnya. Karena energi kinetik tidak secara eksplisit dinyatakan dalam peubah fisis, maka digunakan metode asimtotik untuk menentukan energi totalnya. Dalam hal ini diasumsikan bahwa gelombang interfacial yang ditinjau cukup panjang, dan amplitudo yang cukup kecil. Persamaan Korteweg de- Vries (KdV) diperoleh, jika disumsikan bahwa gelombang interfacial hanya merambat pada satu arah, sedangkan jika gelombang tersebut merambat ke dua arah, diperoleh persamaan Boussinesq.
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