Judul: Penambahan Feed Additive Berbasis Selenium Organik dalam Pakan terhadap Kinerja Pertumbuhan Udang Vaname Litopenaeus vannamei
Abstrak: Penelitian ini bertujuan mengukur kinerja pertumbuhan udang vaname (Litopenaeus vannamei) yang diberi suplementasi selenium organik. Terdapat tiga perlakuan berbeda, yaitu K (pakan tanpa feed additive), A (selenium organik dan zinc), dan B (selenium organik). Penelitian ini menggunakan rancangan acak lengkap dengan tiga perlakuan dan empat ulangan. Udang yang digunakan adalah udang vaname dengan ukuran rata-rata 1,5 g sebanyak 15 ekor/akuarium. Pemeliharaan udang uji dilakukan selama 56 hari pada akuarium berukuran 60 × 40 × 45 cm3 . Udang uji diberi pakan lima kali sehari, dengan metode pemberian pakan berdasarkan feeding rate yaitu 5-8% yang disesuaikan dengan biomassa udang setiap 14 hari. Hasil penelitian ini menunjukan nilai laju pertumbuhan harian, pertambahan bobot harian, rasio konversi pakan, dan rasio efisiensi protein lebih baik pada udang yang diberikan perlakuan dibandingkan kontrol. Udang vaname yang diberi pakan perlakuan A (selenium organik dan zinc) memperlihatkan kinerja pertumbuhan terbaik dibanding perlakuan lainnya., The experiment was conducted to measure the growth performance of white shrimp (Litopenaeus vannamei) given organic selenium supplementation. There were three different treatments, namely K (feed without feed additive), A (organic selenium and zinc), and B (organic selenium). This study used a completely randomized design with three treatments and four replications. The shrimp used were vaname shrimp with an average size of 1.5 g as many as 15 fish/aquarium. The rearing of the test shrimp was carried out for 56 days in an aquarium measuring 60 × 40 × 45 cm3. The test shrimp were fed five times a day, with a feeding method based on a feeding rate of 5-8% adjusted for shrimp biomass every 14 days. The results of this study showed that the daily growth rate, daily weight gain, feed conversion ratio, and protein efficiency ratio were better in the treated shrimp than the control. Vannamei shrimp fed with treatment A (organic selenium and zinc) showed the best growth performance compared to other treatments.
Keyword: growth, selenium, white shrimp, zinc

Judul: Evaluation of micromineral-based feed additive suplementation on growth performance and health of vaname shrimp litopenaeus vannamei
Abstrak: Mineral adalah salah satu mikronutrien yang dibutuhkan makhluk hidup. Mineral mempunyai fungsi dalam metabolisme terutama sebagai kofaktor enzim. Terdapat dua jenis mineral, yaitu makromineral dan mikromineral. Penelitian ini bertujuan untuk mengevaluasi suplementasi feed additive berbasis mikromineral terhadap pertumbuhan dan kesehatan udang vaname Litopenaeus vannamei. Penelitian menggunakan tiga perlakuan, yaitu kontrol, FA1, dan FA2. Udang yang dipakai adalah udang berbobot 5,95 ± 0,04 g ditebar dalam bak fiber berdiameter 150 cm dengan ketinggian air 70 cm. Setiap bak ditebar 150 ekor udang dan dipelihara selama 70 hari. Udang diberi pakan dengan metode ad restricted/menentukan feeding rate. Hasil penelitian ini menunjukkan penambahan FA1 dapat meningkatkan nilai SGR pada hari ke-14 dan ke-28, tetapi tidak pada hari ke-42 hingga akhir masa pemeliharaan. Nilai ADG, FCR, PER, dan SR tidak berbeda nyata antar perlakuan hingga akhir masa pemeliharaan. Penambahan FA2 dapat menurunkan nilai THC dan aktivitas fagositosis udang vaname, Minerals are one of the micronutrients needed by organism. Minerals have a function in metabolism, especially as enzyme cofactors. There are two types of minerals, namely macrominerals and microminerals. This study aims to evaluate micromineral-based feed additive supplementation on the growth and health of vaname shrimp Litopenaeus vannamei. This study used three treatments, namely control, FA1, and FA2. Shrimp used are shrimp weighing 5.95 ± 0.04 g reared in a fiber tub with a diameter of 150 cm and water level of 70 cm. Each tub was stocked with 150 shrimp and kept for 70 days. Shrimp are fed with an ad restricted method/ determined feeding rate. Results of this study indicated that the addition of FA1 could increase the SGR value on the 14th and 28th days, but not on the 42nd day until the end of the maintenance period. ADG, FCR, PER, and SR values were not significantly different between treatments until the end of the rearing period. The addition of FA2 could reduce the THC value and phagocytosis activity of vaname shrimp
Keyword: growth, immune, micromineral, white shrimp

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology