<em>The objective of research was to evaluate the effect of different level of decomposers from bioethanol waste as a bioactivator to compost nutrient content. The materials used in this study were feces collected from six 3 to 5 years old of male Fresian Holstein (PFH), and decomposer agents from processed-bioethanol waste. The experimental design used was completely randomized design with four treatments and six replications, i.e. P1: 0.4% of decomposer, P2: 0.5% of decomposer, P3: 0.6% of decomposer, P4: 0.7 of decomposer %. Analysis of nutrient contents of compost was conducted at the the Laboratory of Chemistry and Soil Fertility, Department of Soil Science, Faculty of Agriculture, Gajah Mada University, Yogyakarta. Data analysis was performed using Minitab 17 software. The results of the analysis of variance showed that different levels of decomposer affected organic C, phosphor (P), Kalium (K), and Magnesium (Mg). </em><em>Organic C, P, K, and Mg contents were found highest in P2, on the other hand N and Ca contents, C/N ratio, pH, and temperature of compost were not different among treatments. It could be concluded that compost made with 0.5% decomposer agents from processed-bioethanol waste was the best.</em>
Upaya peningkatan produktivitas kambing lokal Indonesia dapat dilakukan dengan crossbreeding (persilangan) yang memanfaatkan efek heterosis atau hybrid vigor(HV). Saat ini, kambing Boer telah banyak disilangkan dengan kambing Jawarandu untuk membentuk silangan kambing pedaging bernama Boerja.Penelitian ini bertujuan mengetahui nilai HV hasil persilangan kambing Boer dan Jawarandurelatifterhadap rerata kedua tetua (parents average)dan terhadap tetua betinanya. Sebanyak 504 data bobot badan (BB) yang berasal dari pejantan Boer (n = 6), betina Jawarandu (n = 15), Boerja (Boer × Jawarandu) F1 (n = 298), Boerja F2 (n = 167) dan Boerja F3(n = 18) digunakan untuk analisis dalam penelitian ini. Metode persilangan dilakukan secara backcross, yaitu Boerja F2 didapatkan dari Boer (♂)× Boerja F1 (♀), sedangkan Boerja F3 dihasilkan dari Boer (♂) × Boerja F2 (♀).Rerata dan simpangan baku BB kambing Boer,
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