Judul: Kinetika Produksi Gas dan Kecernaan in Vitro Pakan dengan Penambahan Mineral Organik Hasil Inokulasi dengan Saccharomyces cerevisiae dan Suplementasi Hijauan Bertanin
Abstrak: This research was aimed to observe the effect of organic micromineral, tanniniferous forage and its combination supplementation to gas production and in vitro digestibility.This research used king grass (Pennisetum hybrid) as control, leaves of neem (Azaditachta indica) as tanniniferous forage and monensin as antibiotic. A completely randomized design was applied to this research by using 7 treatments with 3 replications. Variables observed were physical quality of fermented feed, in vitro digestibility, number of protozoa, production of ammonia (NH3), concentration of methane (CH4), production of VFA, and gas production. The treatments were: P (P. hybrid), PO (P. hybrid + organic mineral 3%), POA (P. hybrid + organic mineral 3% + A. indica 2%), PM (P. hybrid + inorganic mineral 3%), PMA (P. hybrid + inorganic mineral 3% + A. indica 2%), PA (P. hybrid + A. indica 2%), PMO (P. hybrid + monensin 40 ppm). Results showed that inorganic mineral supplementation (PM) decreased digestibility of dry matter, i.e. from 63.95% to 32.14% (P<0.001). Organic mineral supplementation (PO) and inorganic mineral + A. indica (PMA) increased butyric acid production from 17.93 mM to 28.09 and 25.89 (P<0.01), respectively. Organic mineral supplementation + A. indica (POA) decreased total gas production from 45.37 to 41.55 ml (P<0.01). It can be concluded that organic mineral supplementation only affected butyric acid production and decreased total gas production when added with tanniniferous forage.
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Judul: Evaluation of the Addition Premix Combination of Methane Inhibitor, Mineral Mix, and Probiotics in Ruminant in Vitro
Abstrak: Penelitian ini bertujuan untuk mengevaluasi premix kombinasi dengan campuran methane inhibitor berupa tanin, mineral mix, dan probiotik terhadap kecernaan, fermentabilitas, dan pengukuran gas metana. Penelitian ini menggunakan Rancangan Acak Kelompok dengan 12 perlakuan dan 5 ulangan. Variabel yang diamati adalah pH rumen, produksi gas total, produksi gas metana, kecernaan bahan kering, kecernaan bahan organik, dan N-NH3. Semua perlakuan menggunakan tanin cair kecuali L0 = tanpa penambahan dan L6 = dengan penambahan probiotik saja. Data dianalisis menggunakan analysis of variance (ANOVA) dan hasil yang signifikan (P<0,05) diuji lebih lanjut menggunakan uji kontras. Hasil penelitian menunjukkan bahwa penambahan tanin cair, probiotik, dan mineral organik berpengaruh nyata terhadap pH rumen, produksi total gas, produksi gas metana, kecernaan bahan kering, kecernaan bahan organik, dan N NH3. Kesimpulan dari penelitian ini adalah penambahan tanin cair, probiotik, dan tembaga akan menurunkan produksi gas total, produksi gas metana, kecernaan bahan kering, kecernaan bahan organik, dan N-NH3., This study aimed to evaluate the premix combo with a mixture of methane inhibitors in the form of tannin, mineral mix, and probiotics on digestibility, fermentability, and measurement of methane gas. This study used randomized block design with 12 treatments and 5 replications. The observed variables were rumen pH, gas total production, methane gas production, dry matter digestibility, organic matter digestibility, and N-NH3. All of the treatments were used liquid tannin except for L0 = without addition and L6 = with additions probiotic only. Data were analyzed using analysis of variance (ANOVA) and significant results (P<0.05) were further tested using contrast’s test. The results showed that the addition of liquid tannin, probiotic, and organic mineral (Fe, Mn, Cu) had a significant effect on rumen pH, gas total production, methane gas production, dry matter digestibility, organic matter digestibility, and N-NH3. The conclusion of the research was the addition of liquid tannin, probiotic, and Cuprum would decrease total gas production, methane gas production, dry matter digestibility, organic matter digestibility, and N-NH3.
Keyword: digestibility, fermentability, organic mineral, probiotic, tannin

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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