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All Journal Buletin Peternakan Jurnal Ilmu Ternak Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat JEPA (Jurnal Ekonomi Pertanian dan Agribisnis) TIJAB (The International Journal of Applied Business) Journal of Tropical Animal Science and Technology Bantara Journal of Animal Science Jurnal Nukleus Peternakan Buletin Peternakan Tropis (Bulletin of Tropical Animal Science) Participative Journal (PJ) : Jurnal Pengabdian Pada Masyarakat Mejuajua Tropical Animal Science SEAS (Sustainable Environment Agricultural Science) Agriwar Journal Jurnal Pelayanan dan Pengabdian Masyarakat Indonesia Jurnal Ilmiah Ilmu-Ilmu Peternakan Indo-Fintech Intellectuals: Journal of Economics and Business West Science Journal Economic and Entrepreneurship West Science Interdisciplinary Studies West Science Interdisciplinary Studies Mutiara : Jurnal Ilmiah Multidisiplin Indonesia West Science Social and Humanities Studies West Science Agro Habitat: Jurnal Ilmiah Ilmu Hewani dan Peternakan International Journal of Management, Accounting & Finance Inovasi Sosial: Jurnal Pengabdian Masyarakat Journal of Agriprecision & Social Impact Journal of Sustainable Agriculture Extension FORUM EKONOMI: Jurnal Ekonomi, Manajemen dan Akuntansi International Journal of Business, Marketing, Economics & Leadership Jurnal Bersama Ilmu Ekonomi Indonesian Journal of Sustainable Agriculture and Environmental Sciences Indonesian Journal of Small Scale Farming Integrated Nutrition Journal INTERNATIONAL JOURNAL OF ECONOMIC LITERATURE (INJOLE) PIMS: Paser Institute Journal of Management and Business
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Production Cost Analysis of Broiler Business with Semi Closed House System Cori Qamara; Widiarta, I Putu Gede Didik; Aldiyanti, Amani; Fatmarischa, Novemia; Wijakesuma, Made Herdinata
Journal of Agriprecision & Social Impact Vol. 2 No. 1 (2025): March: JAPSI (Journal of Agriprecision & Social Impact)
Publisher : CV. Komunitas Dunia Peternakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62793/japsi.v2i1.45

Abstract

This study aims to analyze the production costs of the boriler chicken farming business with a semi-closed house system with a population of 1000 chickens. The case study approach is the methodology employed in this study. Two categories of data are utilized: primary and secondary. Recording pricing from owners is the primary source of data. Reading resources that are secondary data and are taken from government records and earlier studies. The following cost formulas were used to examine the data: depreciation costs, variable costs, total costs, total revenue, profit, R/C, and BEP. The components of cages are sufficiently advanced to reduce the negative environmental effects on broilers. Semi-closed house cages are more affordable than closed house cages, despite having technology-based component. The result shows that that feed expenses are the most expensive aspect of manufacturing. The total cost for one semi-closed house cage with a population of 1000 chickens is IDR 49,469,122. The total revenue in this study was IDR 51,045,000 and profit was IDR 1,575,878/periode. The value of R/C for semi-closed house system in this study was 1.03. A semi-closed house farm with 1000 broilers has a BEP price of IDR 49,469.12/Kg.  It is possible to operate a broiler farm with 1000 chickens using a semi-closed system. In light of the semi-closed house system broiler business's production expenses, it is hoped that the study's findings will serve as a reference for readers.
The Effectiveness of Reproductive Innovations in Female Goats: A Qualitative Analysis of Productivity and Economic Sustainability in Goat Farming Widiarta, I Putu Gede Didik; Adiputra, Kirana Dara Dinanti; Yuliyanti, Karenina Dwi; Fatmarischa, Novemia; Suhardi, Suhardi
Jurnal Ilmiah Ilmu-Ilmu Peternakan Vol 28 No 2 (2025): November 2025
Publisher : Fakultas Peternakan Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jiiip.v28i2.39057

Abstract

Background: Goat farming in Indonesia plays a crucial role in enhancing rural incomes and improving food security. This study investigates the effectiveness of reproductive innovations, including artificial insemination (AI) and hormone synchronization, in boosting productivity and economic sustainability in goat farming. Purpose: This research aims to analyze the impact of artificial insemination (AI) and hormone synchronization on the reproductive efficiency of goats, to identify factors influencing the adoption of these technologies among small-scale goat farmers in Samarinda, Indonesia, and to determine the role of social capital in overcoming adoption barriers. Methods: This study uses a qualitative research approach with a survey method through in-depth interviews, focus group discussions (FGDs), and participatory observations. The sample consists of 15 small-scale goat farmers in Samarinda, Indonesia. Data were analyzed using thematic analysis to identify key challenges and benefits associated with the adoption of reproductive technologies. Results: The findings show that artificial insemination (AI) and hormone synchronization significantly increased reproductive efficiency, resulting in improved offspring production and reduced kidding intervals. However, adoption rates were constrained by high initial costs, limited technical support, and socio-economic barriers such as low education levels and restricted market access. Farmers who were part of cooperative networks achieved better outcomes, demonstrating the importance of social capital in overcoming adoption challenges. Conclusion: Based on the research findings, reproductive technologies have the potential to enhance goat farming productivity and economic sustainability. However, their successful implementation requires supportive policy interventions, including farmer training, improved access to resources, and strengthened market linkages to facilitate wider adoption.
Digital Communication for Empowering Small -Scale Livestock Farmers Qamara, Cori; Widiarta, I Putu Gede Didik
INDONESIAN JOURNAL OF SMALL SCALE FARMING Vol. 2 No. 1 (2026): Volume 2, Number 1, 2026
Publisher : Faculty of Agriculture Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ijoss.2026.v02.i01.p07

Abstract

BACKGROUND AND OBJECTIVES: Farmers in rural East Kalimantan face significant challenges, including limited access to information, low digital literacy, and inadequate technology infrastructure, which hinder the implementation of sustainable farming practices. Despite the increasing availability of digital communication tools and platforms, farmers in remote areas continue to struggle with utilizing technology to manage livestock operations, access markets, and enhance animal health. This study aims to examine the use of digital communication tools by small-scale livestock farmers in East Kalimantan, as well as the benefits they gain and the barriers that limit wider adoption. The objective of this research is to understand the role of digital communication in supporting sustainable livestock practices in rural communities. METHODS: This study employs a qualitative approach, utilizing semi-structured in-depth interviews and focus group discussions (FGDs) with farmers, agricultural extension officers, and relevant stakeholders. The research was conducted in East Kalimantan Province, Indonesia, which was selected for its significant challenges, including limited access to technology and low digital literacy among farmers. Despite these challenges, East Kalimantan also holds great potential for the development of sustainable livestock farming, particularly through the use of digital communication tools. The data was analyzed thematically to identify patterns related to technology adoption, perceived benefits, barriers, and the contribution of digital tools to sustainable livestock management. FINDINGS: The study's findings reveal that farmers utilize smartphones, mobile apps, and social media platforms to access market information, livestock health consultations, and knowledge about sustainable farming practices. The adoption of advanced technologies such as the Internet of Things (IoT) and automation systems remains limited due to high costs, limited digital skills, and weak internet infrastructure. Farmers reported benefits such as improved animal health, better decision-making, and increased efficiency in livestock management; challenges related to digital literacy and access to technology remain significant. CONCLUSION: Digital communication tools have significant potential to enhance sustainable livestock practices among small-scale farmers in rural areas. Several key barriers, primarily the digital literacy gap, infrastructure limitations, and high technology costs, need to be addressed for wider adoption. Strengthening digital training programs, improving internet connectivity in rural areas, and supporting farmer-centered technological initiatives are important steps to maximize the benefits of digital tools. This study contributes to the understanding of digital empowerment in rural livestock farming, emphasizing the need for integrated policy interventions. The limitations of this research include its focus on a single region and a relatively small sample size, indicating the need for further, broader, and comparative research
Analisis Ketersediaan Mineral Fe dan Zn serta Aktivitas Antioksidan pada Bee Pollen Snack Bar: Analysis of Fe and Zn Mineral Availability and Antioxidant Activity in Bee Pollen Snack Bar Qurratu Aini; Ananda Putra Agung; I Putu Gede Didik Widiarta; Cori Camara
Integrated Nutrition Journal Vol. 1 No. 2 (2025): Integr. Nutr. J.
Publisher : Program Studi Gizi, Fakultas Kesehatan Masyarakat, Universitas Mulawarman, Samarinda, Kalimantan Timur, Indonesia. Alamat: Jl. Sambaliung Kampus Gunung Kelua Samarinda 75123, Kalimantan Timur, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/8txa4113

Abstract

Latar belakang: Bee pollen merupakan bahan pangan alami yang kaya mineral esensial dan senyawa bioaktif, sehingga berpotensi dikembangkan sebagai pangan fungsional. Pengolahan bee pollen menjadi snack bar diharapkan dapat meningkatkan nilai tambah dan kemudahan konsumsi. Tujuan: Penelitian ini bertujuan menganalisis ketersediaan mineral Fe dan Zn serta aktivitas antioksidan pada produk bee pollen snack bar. Metode: Penelitian dilakukan secara eksperimental menggunakan rancangan acak lengkap dengan satu faktor yaitu penambahanbee pollen pada produk dengan lima taraf F0, F1, F2, F3 dan F4. Analisis Fe dan Zn dilakukan dengan Spektrofotometri Serapan Atom, sedangkan aktivitas antioksidan diuji menggunakan metode DPPH dan dinyatakan sebagai AEAC. Hasil: Bee pollen snack bar mengandung Fe sebesar 1,7 mg/100 g dan Zn sebesar 0,68 mg/100 g, serta memiliki aktivitas antioksidan sebesar 10,77 mg asam askorbat/g. Kesimpulan: Bee pollen snack bar berpotensi sebagai pangan fungsional sumber mineral Fe dan Zn dengan aktivitas antioksidan yang baik.
Integrating Agribusiness Management, Product Downstreaming, and Consumer Behavior for Sustainable Livestock-Based Food Enterprises Widiarta, I Putu Gede Didik; Ananda Putra Agung; I Gede Arie Mahendra Putra; Muhammad Eriansyah Al Hakim; Made Hardinata Wijakesuma; A.A. Gde Agung Nanda Perwira
Journal of Sustainable Agriculture Extension Vol 4 No 1 (2026): Journal of Sustainable Agriculture Extension
Publisher : Politeknik Pembangunan Pertanian Manokwari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47687/josae.v4i1.1801

Abstract

Latar belakang: Sistem pangan berbasis peternakan berkelanjutan memiliki peran penting dalam menjawab tantangan global terkait ketahanan pangan, gizi, dan kesejahteraan masyarakat pedesaan. Sektor ini masih menghadapi berbagai permasalahan seperti rendahnya efisiensi, keterbatasan nilai tambah, serta lemahnya kepercayaan konsumen terhadap kualitas dan keberlanjutan produk. Kondisi tersebut menuntut transformasi menyeluruh dari model produksi konvensional menuju sistem agribisnis terpadu yang menghubungkan kompetensi manajerial, inovasi produk, dan strategi berbasis perilaku konsumen. Penelitian ini bertujuan untuk mengembangkan kerangka konseptual integratif yang menghubungkan manajemen agribisnis, hilirisasi produk, dan perilaku konsumen untuk memperkuat keberlanjutan usaha pangan berbasis hasil ternak. Metode: Dengan menggunakan pendekatan kualitatif melalui tinjauan pustaka sistematis terhadap publikasi tahun 2020-2025, penelitian ini mensintesis temuan teoritis dan empiris dari konteks global dan Indonesia. Hasil: Hasil penelitian menunjukkan bahwa manajemen agribisnis yang efektif melalui kompetensi manajerial, integrasi rantai nilai sirkular, dan digitalisasi dapat meningkatkan efisiensi dan ketahanan usaha. Hilirisasi produk mendorong penciptaan nilai tambah dan daya saing pasar melalui inovasi teknologi dan pengolahan ramah lingkungan. Sementara itu, perilaku konsumen yang dipengaruhi oleh kesadaran keberlanjutan, kepercayaan sensorik, dan keterikatan emosional berperan penting dalam membentuk preferensi pembelian dan loyalitas merek. Kesimpulan: Integrasi ketiga dimensi tersebut menghasilkan sistem sinergis yang mendorong inovasi, mengurangi limbah, serta memperkuat pertumbuhan pasar berkelanjutan. Kerangka ini berkontribusi pada pengembangan teori agribisnis berkelanjutan dan memberikan implikasi strategis bagi pembuat kebijakan, praktisi, serta wirausaha muda peternakan.
Sustainable Marketing Strategies to Empower Stingless Bee Honey Agripreneurs for Competitive and Inclusive Agribusiness Growth I Putu Gede Didik Widiarta; Riki Andika; I Kadek Sudiarsana; Dinar Anindyasari; Lestari Gita Nur’aini
Indonesian Journal of Sustainable Agriculture and Environmental Sciences (IJSAES) Vol. 1 No. 3 (2025): Indonesian Journal of Sustainable Agriculture and Environmental Sciences (IJSAE
Publisher : CV. Truly Science Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65896/ijsaes.v1i3.19

Abstract

Background: Stingless bee honey presents a high-value niche within sustainable agrifood systems, yet small-scale agripreneurs face structural constraints in marketing, certification, and digital engagement that impede inclusive competitiveness. Aim: This study formulates sustainable marketing strategies to empower stingless bee honey agripreneurs in Samarinda, East Kalimantan, thereby enhancing market access, firm-level resilience, and socio-ecological sustainability. Methods: Employing a convergent mixed-methods design, primary data were collected between July and September 2025 through 27 semi-structured interviews, three focus group discussions (FGDs), direct observation, and structured questionnaires involving 65 agripreneurs, eight cooperative leaders, and six local government or institutional stakeholders. Participants were selected using a purposive sampling strategy to ensure representation across enterprise scales and cooperative membership. Internal and external determinants were assessed using IFE and EFE matrices; results were integrated via IE and SWOT frameworks to derive strategy clusters. Results: The IFE (score = 2.86) and EFE (score = 2.93) positions indicate a “Growth and Build” strategic posture. Four strategy clusters emerged: SO (eco-branding, certification, tourism linkages, e-commerce expansion), WO (digital literacy, quality assurance, managerial capacity building, inclusive finance), ST (value-chain diversification, R&D partnerships, sustainability differentiation, cooperative logistics), and WT (community microfinance, joint marketing, insurance/risk-sharing, partnership models). Triangulation of qualitative and quantitative findings strengthens the validity of these strategic priorities. Conclusion: Integrating sustainability principles with digital marketing and cooperative governance offers a viable pathway for transforming stingless bee honey firms into resilient, inclusive agribusinesses. Policy and institutional support that bolsters access to certification, digital capacity, and cooperative finance are pivotal in translating ecological strengths into competitive market outcomes.
ANALYSIS OF THE INFLUENCE OF DIGITAL MARKETING ON CONSUMER PURCHASING DECISIONS IN THE DIGITAL ECONOMY ERA Loso Judijanto; I Putu Gede Didik Widiarta; Luckhy Natalia Anastasye Lotte
INTERNATIONAL JOURNAL OF ECONOMIC LITERATURE Vol. 3 No. 6 (2025): JUNE
Publisher : Adisam Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research aims to analyze the influence of digital marketing on consumer purchasing decisions in the digital economy era through a literature review approach. The development of information technology has fundamentally changed the marketing landscape, where consumers are now increasingly active and selective in making purchasing decisions. This study was carried out using the library research method, by examining various scientific sources such as journals, books and research reports published in the last five to ten years. The analysis results show that digital marketing elements such as social media marketing, content marketing, and influencer marketing have a significant and consistent influence on the purchasing decision stages, especially in creating awareness, building interest, and encouraging action. Apart from that, this research also found that the influence of digital marketing is strengthened by factors such as consumer trust, brand loyalty, and the quality of digital content which act as mediators and moderators. The implications of these findings indicate that an effective digital marketing strategy must prioritize an integrated, relevant and consumer experience-oriented approach. Thus, strategic use of digital marketing can be the key to winning business competition in an increasingly competitive digital economy era.
Consumer Segmentation and Purchase Behavior in the Frozen Beef Market: Optimizing Product Attributes for Sustainability-Oriented Marketing Strategies I Putu Gede Didik Widiarta; Cori Qamara; Novemia Fatmarischa; Dani Nur Arifin; I Gede Arie Mahendra Putra; Made Hardinata Wijakesuma
SEAS (Sustainable Environment Agricultural Science) Vol. 9 No. 1 (2025)
Publisher : Warmadewa University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/seas.9.1.11601.63-74

Abstract

The frozen beef market is experiencing significant growth, driven by urbanization, rising incomes, and increasing consumer demand for convenient, high-quality protein sources. This study investigates consumer segmentation and purchasing behavior in this market, focusing on optimizing product attributes for sustainability-oriented marketing strategies. A cross-sectional quantitative design was employed, utilizing online surveys to gather data from 385 valid respondents. K-means clustering identified three distinct consumer segments: price-oriented consumers (35%), quality-oriented consumers (45%), and sustainability-conscious consumers (20%). Price-oriented consumers, predominantly from low-income groups, prioritize affordability and product availability, showing limited concern for sustainability attributes. Quality-oriented consumers, typically middle-income, emphasize product quality, hygiene, and safety certifications in their purchasing decisions. Sustainability-conscious consumers, predominantly high-income individuals, prioritize eco-friendly packaging and certifications, demonstrating high involvement and willingness to pay a premium for sustainable products. Regression analysis revealed key factors influencing purchase behavior: price sensitivity for low-income consumers, product quality and safety certifications for middle-income consumers, and sustainability attributes for high-income consumers. Younger and more educated consumers were more responsive to sustainability, while older consumers placed more value on traditional attributes. These findings emphasize the need for targeted marketing strategies, including affordability-focused campaigns for price-sensitive consumers, quality-driven branding for mid-level buyers, and sustainability-focused messaging for eco-conscious consumers. The study also highlights the broader implications of promoting sustainable practices in meat production to align with global Sustainable Development Goals (SDGs) and the increasing consumer demand for ethical consumption
Analysis of Artificial Insemination Success Rates and Sustainability in East Kalimantan Province Kirana Dara Dinanti Adiputra; I Putu Gede Didik Widiarta; Andi Nurmasytha; Desy Raharjo
SEAS (Sustainable Environment Agricultural Science) Vol. 9 No. 2 (2025)
Publisher : Warmadewa University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/seas.9.2.12433.115-125

Abstract

The reproductive performance of beef cattle in East Kalimantan remains a significant challenge, particularly concerning the success of artificial insemination (AI) in improving herd productivity. As the region aims to boost livestock production, understanding the effectiveness of AI becomes crucial. This study analyzes the success rate of AI in beef cattle in East Kalimantan from 2022 to 2024. Using a quantitative-descriptive approach, secondary data were obtained from the Indonesian National Animal Health Information System (iSIKHNAS) and verified by the Livestock and Animal Health Service Office of the East Kalimantan Provincial Government. The success rate of AI was measured through calving rate (CvR), relative effectiveness of AI compared to natural mating, and the proportion of calving births from both methods. The results show AI calving rates of 25.86% in 2022, 10.10% in 2023, and 45.36% in 2024. The relative effectiveness of AI compared to natural mating increased in 2024, with a ratio of 1.3. The proportion of calving births through AI fluctuated yearly, indicating that while AI adoption is growing, natural mating continues to play a critical role in the reproductive system of beef cattle in East Kalimantan Province.
Unveiling the Potential of Circular Economy in Cattle Waste Management for Achieving Sustainable and Green Growth Alina Azzara; I Putu Gede Didik Widiarta; Muhammad Fahrul; Rahmat Budi Ramadhani
SEAS (Sustainable Environment Agricultural Science) Vol. 9 No. 2 (2025)
Publisher : Warmadewa University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The cattle industry is a key component of the global agricultural economy, and faces significant challenges related to waste management and environmental sustainability. In response to growing concerns over greenhouse gas emissions and resource depletion, this study investigates the potential of circular economy (CE) principles in transforming cattle waste management practices to promote a green economy and sustainable development. This study employs a comprehensive literature review methodology to analyze various strategies for implementing CE approaches in the cattle sector, synthesizing findings from relevant publications. The study aims to identify effective methods for reducing methane emissions, enhancing resource utilization efficiency through biogas and organic fertilizer production, and fostering cross-sectoral integration between livestock and agricultural operations. The results highlight the potential for CE implementation to substantially reduce the environmental footprint of cattle farming while creating new revenue streams. Key challenges include the need for technological infrastructure investment, supportive government policies, and enhanced farmer education. The study concludes that strategic policy interventions are essential to incentivize the adoption of CE practices, promote technological innovation, and ensure the long-term sustainability of the cattle industry. The findings provide actionable insights for policymakers, industry stakeholders, and researchers to foster the transition toward a more resource-efficient and environmentally responsible cattle sector.
Co-Authors A.A. Gde Agung Nanda Perwira Adiputra, Kirana Dara Dinanti Aditya Alqamal Alianta Agung, Ananda Putra Ainun Zalsabila Akhmat Rizkuna Alina Azzara Alina Azzara Amalina Nur Wahyuningtyas Amalina Nur Wahyuningtyas Amalina Nur Wahyuningtyas Amani Aldiyanti Amani Aldiyanti Ananda Putra Agung Ananda Putra Agung Andi Nurmasytha Andi Nurmasytha Anhar Faisal Fanani Anindyasari, Dinar Anindyasari, Dinar Ardiansyah Ardiansyah Ari Wibowo Ari Wibowo Arinana Arinana Asniar, Nunut Budi Rahayu Tanama Putri Bunyamin, Ilham Akbar Cori Camara Cori Qamara Cori Qamara Cori Qamara Cori Qamara Dani Nur Arifin Dani Nur Arifin Dede Aprylasari Desy Raharjo Dinar Anindyasari Dinar Anindyasari Dinar Anindyasari Dwi Yuzaria Fadhil Muharram Faisal Azmi Fajrih, Nurul Fatmarischa, Novemia Hakim, Nur Hamdi Hamdi Hamdi Mayulu I Gede Arie Mahendra Putra I Gede Arie Mahendra Putra I Gede Made Widya Pustaka Jaya I Kadek Sudiarsana I Kadek Yoga Kertiyasa I Wayan Suarna I Wayan Suarna Ibrahim Iwan Harsono James Hellyward Judijanto, Loso Karenina Dwi Yulianti Kharidha Armina Khoiru Indana Kirana Dara Dinanti Adiputra Kirana Dara Dinanti Adiputra Kirana Dara Dinanti Adiputra Kirana Dara Dinanti Adiputra Kunaifi Wicaksana, Kunaifi Lestari Gita Nur’aini Loso Judijanto Luckhy Natalia Anastasye Lotte Madarisa, Fuad Made Hardinata Wijakesuma Made Hardinata Wijakesuma Made Hardinata Wijakesuma Muhammad Eriansyah Al Hakim Muhammad Fahrul Muhammad Fahrul Muhtadi, Ammar N.L.G. Sumardani Ni Nyoman Suryani Ni Nyoman Suryani NI PUTU MARIANI Novemia Fatmarischa Novemia Fatmarischa Novemia Fatmarischa Nurmasytha, Andi Prihutomo Suharto Putra, Firdaus Qurratu Aini Qurratu Aini Rahmat Budi Ramadhani Rahmat Budi Ramadhani Rahmat Gusri Ramiyati, Nekky Revaldo Adhi Pramana Riki Andika Riki Andika Riki Andika Riki Andika Risa Juliadilla Roosena Yusuf Roosena Yusuf, Roosena Ruth Dameria Haloho Sofalina, Fresa Dwi Juniar Suhardi Suhardi Suhardi Suhardi Suharto, Prihutomo Sukandi Taufan Purwokusumaning Daru, Taufan Purwokusumaning Tri Hendarto Wahyuningtyas, Amalina Nur Wijakesuma, Made Hardinata Wijakesuma, Made Herdinata Yuliyanti, Karenina Dwi Yustinus C Sinaga