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All Journal Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Tropical Animal Science Journal
Irawan, A.
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Energy Mechanical Engineering Physics

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Pengujian konsumsi daya baterai litium-ion pada sepeda motor listrik dengan variasi kemiringan lintasan Zain, A.T.; Suranto, D.D.; Irawan, A.; Karimah, C.N.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.620

Abstract

The development of electric vehicles in Indonesia, especially the BEV (Battery Electric Vehicle) type, has received serious attention and support from the government. This is evidenced by the issuance of Presidential Regulation Number 55 of 2019 concerning the acceleration of the Battery-Based Electric Motor Vehicle Program for Road Transportation. Electric vehicles designed and developed in this study use an on-wheel BLDC type electric motor, Li-Ion batteries and are equipped with a watt hour meter to monitor battery consumption. The results of testing the accuracy and precision of the watt hour meter show a good value. This is evidenced by the difference in the measurement value of the watt hour meter against the Avometer and the difference between each repetition of the data 5 times which is below 1 Volt and 1 Ampere. Other test results show that the track with a large slope will also experience a large voltage drop, namely 0.8 V at a slope of 100 and the maximum current flowing is 8.35 A. Meanwhile, when the slope of the track is 70 and 60, the battery voltage decreases and the current flowing respectively are 0.5 V and 8.12 A; as well as 0.2 V and 7.84 A.
A Comprehensive Meta-Analysis of Cassava Addition in a Buffalo Diet: In Vivo Investigations on Performance and Rumen Health Amirul, F. M. A.; Mazlan, N. A.; Sadarman, S.; Rusli, N. D.; Sholikin, M. M.; Irawan, A.; Febrina, D.; Qomariah, N.; Nurfitriani, R. A.; Aditya, S.; Jayanegara, A.; Saad, M. Z.; Adli, D. N.; Hassim, H. A.
Tropical Animal Science Journal Vol. 48 No. 4 (2025): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2025.48.4.298

Abstract

This meta-analysis compiles data on buffalo consumption of cassava as a feed ingredient to evaluate its impact on in vivo rumen fermentation, feed intake, nutrient intake, growth performance, digestibility, nitrogen metabolism, haematology, microbiology, and milk yield. A systematic search of Scopus and Web of Science identified 19 in vivo experiments. Cassava varieties were categorized as by-products, foliage, and roots, while buffaloes were stratified based on management system, breed, and sex. A linear mixed model was applied to estimate the effects of cassava inclusion. The findings indicated feed and nutrient intake, particularly crude protein intake and nitrogen retention, increased significantly (p<0.05), while crude protein digestibility showed no significant difference. Microbiological parameters, including total bacterial and fungal counts, also increased significantly (p<0.05), whereas methane production after 24 hours declined significantly (p<0.05). Although production parameters such as body weight, feed conversion, and milk yield were not significantly affected, a trend toward improvement was observed, except for feed conversion. Cassava root and foliage exhibited the highest digestibility and nitrogen retention compared to by-product (p<0.05). A restricted feeding system resulted in higher ammonia (NH3-N) concentrations, protozoa count, and proteolytic and cellulolytic microbial populations compared to ad libitum feeding and an extensive system (p<0.05). Murrah buffaloes showed greater feed intake, while male buffaloes demonstrated higher digestibility (p<0.05). In conclusion, dietary cassava, approximately 1.5% to 20.5% DM, potentially stimulates rumen fermentation, nutrient intake, digestibility, and microbiology but has only a modest effect on production parameters. High cassava inclusion may reduce feed acceptability, thereby decreasing feed efficiency.
Nutrient Digestibility, N Balance, Performance, and Blood Parameters of Kacang Goats Differing in GDF9 Genotype Fed Different Sources of Dietary Fiber Irawan, A.; Hartatik , T.; Bintara, S.; Astuti, A.; Kustantinah
Tropical Animal Science Journal Vol. 47 No. 1 (2024): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2024.47.1.33

Abstract

This study aims to determine the impact of different GDF9 genotypes on feed intake, nutrient digestibility, and nitrogen balance in Kacang goats by examining various metabolic processes. Twenty-nine Kacang goats were genotyped using PCR-RFLP DNA at position g.3855A/C of the GDF9 gene in exon 2. A 2 × 2 factorial design with two factors, namely, diet type (diets 1 and 2) and genotype (homozygote AA and heterozygote AC), was adopted. Diet 1 group comprised 11 goats with the AA genotype and 4 goats with the AC genotype, and the diet 2 group consisted of 9 goats with the AA genotype and 5 goats with the AC genotype. Both diets had the same protein content (iso-protein) and consisted of free-choice Napier grass (Pennisetum purpureum). Diet 1 had an additional 400 g of concentrate containing 11.25% crude protein (CP) and 55.86% total digestible nutrients (TDN). Diet 2 was a total mixed ration (TMR) containing 12.46% crude protein and 67.92% TDN. Results demonstrated a significant interaction (p<0.05) effect between diet and genotype on crude protein (CP) digestibility, neutral detergent fiber (NDF) digestibility, fecal nitrogen (N feces), urinary nitrogen (N urine), nitrogen retention (%), and blood urea nitrogen (BUN). However, no significant interaction effect was observed on the consumption of dry matter (DM), CP, crude fiber (CF), nitrogen free extract (NFE), and NDF and the digestibility of DM, CF, and NFE. TMR resulted in a 9% higher consumption of NDF, higher nutrient digestibility, improved nitrogen balance, average daily gain (ADG), and elevated glucose levels compared with diet 1. Kacang goats with the AC genotype exhibited better CP digestibility and increased nitrogen intake than those with the AA genotype. In conclusion, the GDF9 genotype influences the nutrient digestibility in Kacang goats, and those with the AC genotype utilize feed nutrients more efficiently than those with the AA genotype. The AC genotype resulting from the GDF9 gene mutation at position g.3855A>C can be used for genomic marker selection of high-quality Kacang goats in nutrient digestibility.
Co-Authors A. Astuti, A. Aditya, S. Adli, D. N. Amirul, F. M. A. Anuraga Jayanegara Bintara, S. Febrina, D. H. A. Hassim, H. A. Hartatik , T. Karimah, C.N. Kustantinah Mazlan, N. A. Nurfitriani, R. A. Qomariah, N. Rusli, N. D. Saad, M. Z. Sadarman, S. Sholikin, M. M. Suranto, D.D. Zain, A.T.