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All Journal Journal of the Indonesian Tropical Animal Agriculture Tropical Animal Science Journal
E. Purbowati
Faculty of Animal and Agricultural Sciences, Diponegoro University, Tembalang Campus, Semarang 50275
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Energy

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Journal : Tropical Animal Science Journal

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Optimizing Methane Production from Anaerobic Digestion of Dairy Cow Manure: The Potential Use of Carica (Carica pubescens) Seeds as a Co-Substrate Purwasih, R.; Saindah, M.; Triyuwanti, H.; Yusuf, F. S.; Purnomoadi, A.; Purbowati, E.; Sutaryo, S.
Tropical Animal Science Journal Vol. 48 No. 1 (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.2025.48.1.37

Abstract

A method to increase methane production in dairy cow manure (DCM) is to co-digest DCM with nutritious biomass. This study aimed to determine the methane yield during the anaerobic co-digestion of DCM and carica seeds meal (CSM). Four continuous stirred tank reactors were operated with treatments P0 (100% DCM), P1 (98% DCM and 2% CSM), P2 (96% DCM and 4% CSM), and P3 (94% DCM and 6% CSM). The results demonstrated that the presence of CSM as a co-substrate of DCM significantly increased (p<0.05) methane production. The average methane production resulting from P0, P1, P2, and P3 in units of mL/g substrate and mL/g volatile solid (VS)added were 10.05, 20.54, 32.26, and 19.29 mL/g substrate and 171.49, 278.96, 357.92 and 179.30 mL/g VSadded, respectively. Thus, the highest methane production was obtained at P2. Treatment P3 contained a substrate containing excessively high protein and organic content, negatively affecting anaerobic microorganisms’ activity. The presence of CSM as a co-substrate enhanced methane production by 91.94%–221.06% compared with the control. The presence of CSM as a co-substrate significantly increased (p<0.05) volatile fatty acid and total ammonia nitrogen (TAN) concentrations and the pH of digested slurries but did not affect VS reduction. The co-digestion of DCM and CSM must consider the proportion of organic material in the mixed substrate. In this study, the mixed substrate with a VS proportion of 51.68% was the best-mixed substrate.
Productivity, Carcass Traits, and Meat Quality of Local Lambs Fed with Carica pubescens Seeds Meal Idayanti, R. W.; Istianah, I.; Putri, S. N. H.; Fauziah, A. N.; Murniyadi, Z.; Esnadewi, L. G.; Purbowati, E.; Arifin, M.; Purnomoadi, A.
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.2024.47.1.87

Abstract

This study aimed to determine the effect of substituting agricultural by-products of Carica pubescens seeds meal with some concentrates on productivity, carcass characteristics, and meat quality of local lambs. Eighteen male thin-tailed lambs with an average initial body weight of 10.68 ± 1.3 kg (3-4 months old) were treated with a completely randomized design for ten weeks. The feed ingredients were C. pubescens, Pakchong grass (PG), and concentrate (K). Feed ingredients were prepared into complete feed with a balance of forage and concentrate 40:60% with three treatments, namely: T1= 40% PG + 55% K + 5% C. pubescens; T2= 40% PG + 47.5% K + 12.5% C. pubescens; and T3= 40% RG + 40% K + 20% C. pubescens. The use of 20% C. pubescens-treated lambs was statistically different (p<0.05) regarding the increasing BWG (115.60 g/day), CPI (104.96 g/day), FCR (6.40), slaughter weight (19.62 kg), carcass weight (7.83 kg), meat weight (4.49 kg), and fat weight (1.66 kg). The treatment with 12.5% C. pubescens resulted in significantly different increasing tenderness (p<0.05) in longissimus dorsi and biceps femoris muscle pain (2.79 kgf/cm2) and (3.36 kgf/cm2), respectively. The inclusion level of C. pubescens seeds up 20% resulted in higher body weight gain, crude protein intake, feed cost ratio, slaughter weight, carcass weight, and meat weight.
Co-Authors A. Prima A. Purnomoadi E. Kurnianto E. Rianto Esnadewi, L. G. Fauziah, A. N. H.F. Suryani Idayanti, R. W. Istianah, I. M. Arifin Murniyadi, Z. Putri, S. N. H. Rita Purwasih S. Sutaryo Saindah, M. Triyuwanti, H. Yusuf, F. S.