Judul: Biokonversi dedak padi oleh kapang aspergillus ficuum sebagai upaya menurunkan kadar fitat dan pengaruhnya terhadap kinerja ayam petelur
Abstrak: Three experiments were conducted to evaluate the performance of laying hens fed on fermented rice bran (FRB) utilizing A. ficuum. First, the phytase-producing ability of A. ficuum was tested. The mold produce 2.561 AU of phytase was grown for 88 hours on rice bran medium. Second, in vitro and in vivo studies were carried out on rice bran before and after fermented utilizing A. ficuum. Fermentation of rice brand reduced phytic acid by about 83.25 persen, but had no effect on protein digestibility. Protein content, Ca and P retention, and P availability in FRB were higher (P<0.05) than in unfermented rice bran (URB). There were no differences in metabolizable energy content and N retention. Third, five treatment-diets and a control diet were each fed to five groups of four hens in individual battery cages. The treatment diets contained 10 to 50 persen FRB, the control diet contained 30 persen URB. All diets contained 15 persen protein with 2650 kcal/kg ME and had similar Ca, Pav, lysine methionine and TSAA contents. Egg production, egg weight, feed conversion, Haugh unit, shell thickness, yolk index, Ca retention and Mg content of shell were not affected by fermentation. Feed consumption and P retention in shell of hens fed FRB diets were higher (P<0.05) than those fed the control diet. The higher FRB content of diet increased (P<0.05) feed conversion, P retention and Mg content of shell; reduced (P<0.05) feed consumption, egg production and yolk in-index. Egg weight, Haugh unit, shell thichness and Ca retention in shell were not affected.
Keyword: Biokonversi; Aspergillus ficuum; feed conversion.

Judul: Pengaruh Penggunaan Wheat Bran yang Difermentasi Aspergillus niger terhadap Nilai Energi Metabolis Ransum Ayam Broiler
Abstrak: Wheat bran (WB) is a by product of wheat processing industry which is potential as poultry feed ingredient. The problem of using wheat bran as poultry feed was relatively low in available energy and protein, due to high of crude fiber. It necessary to ferment the wheat bran to increase the nutrients availability. The objective of this study was to determine the metabolizable energy of broiler diets contained fermented wheat bran (WBF). The treatment diets were R0 (diet without WB or WBF), R1 (diet contained 15% of WB), R2 (diet contained 15% of WBF), R3 (diet contained 20% of WBF), R4 (diet contained 25% of WBF), and R5 (diet contained 30% of WBF). The diets contained 3150 kcal/kg ME and 20% crude protein according to Leeson and Summers (2005). This research used Completely Randomized Design (CRD) with 6 treatments and 4 replications, was used 30 broilers aged 35 days, 24 broilers were fed the test diets and 6 broilers tasted to measure endogenous energy. The data obtained were analyzed using analysis of variance (ANOVA) and further tested using orthogonal contrast test toward significantly different data. The research results indicated that the energy consumption and energy excretion was not significantly affected due to the treatments. The treatments significantly decreased (P<0,01) the metabolizable energy (AME, AMEn, TME, TMEn) of 12.04%; 16.71%; 25.33%; 23.89%; and 24.89% compared with control. It is concluded that the usage of unfermented or fermented wheat bran 15-30% decreased the metabolizable energy of broiler diets
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.