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Articles by Komang G. Wiryawan
Total Records ( 3 ) for Komang G. Wiryawan
  Antonius , Komang G. Wiryawan , Amlius Thalib and Anuraga Jayanegara
  The objective of the present study was to investigate feed digestibility and methane emissions of ration based on oil palm by-products on addition of probiotics, namely Acetoanaerobium noterae and Saccharomyces cerevisiae and banana stem in vitro. The substrate, i.e., oil palm by-products consisted of oil palm midrib, oil palm leaf, oil palm kernel cake and oil palm sludge in the ratio of 30, 30, 30 and 10%, respectively. The following treatments were tested: control (R0), R0+S. cerevisiae (R1), R0+A. noterae (R2), R0+S. cerevisiae+A. noterae (R3), R0+ banana stem (R4), R0+banana stem+S. cerevisiae (R5), R0+banana stem+A. noterae (R6) and R0+banana stem+S. cerevisiae+A. noterae (R7). The treatments were incubated in vitro with buffered-rumen fluid in four replicates (represented by three incubation units per replicate), conducted for 48 h at 39oC. Gas production and methane emission were measured at regular time point intervals. After the incubation, digestibility, Volatile Fatty Acids (VFA), ammonia and microbial counts were determined. Results showed that the highest dry matter digestibility was shown by R5 and the best reduction of methane emission was shown by R2 at 12 h of incubation. In conclusion, supplementation of probiotics did not affect the digestibility of ration based on oil palm by-products but A. noterae addition was potential to mitigate ruminal methane emission.
  Jola J.M.R. Londok , Wasmen Manalu , Komang G. Wiryawan and Sumiati
  Background: Besides as an energy source, coconut oil with its lauric acid content can improve the growth performance, carcass characteristics and fatty acids profile of broiler chickens. Conventional processing of coconut oil is susceptible to hydrolytic oxidation that reduces its antioxidant content. Areca vestiaria Giseke (AV) with its phenol content acts as a natural antioxidant in the diet. Materials and Methods: Two hundred and forty day-old unsexed Lohmann broiler chicks (MB-202 P) were divided into 24 experimental units (ten chicks/unit) and arranged in a completely randomized design with a 2×4 factorial arrangement. Each experimental unit was repeated 3 times each with ten chicks. The first factor was the source of lauric acid in the ration consisted of 2 levels i.e., coconut oil and pure lauric acid. The second factor was dose of antioxidant consisted of 4 levels i.e., 0 [without antioxidant (AV and lauric acid) supplementation], AV at a dose of 625 mg kg–1 ration, AV at a dose of 1250 mg kg–1 ration and tocopherol at a dose of 200 ppm). Parameters measured were growth performance, carcass characteristics and fatty acid profiles of broiler breast meat. Results: On the first stage trial, AV can be used as a source of natural antioxidant in the diet of broiler. The feeding trial showed that the treatments highly significantly affected (p<0.01) weight gain, feed consumption, feed conversion ratio, breast weight/eviscerated weight percentage, abdominal fat weight/eviscerated weight percentage and significantly affected (p<0.05) dressing percentage. Low growth performance and carcass characteristics in broiler chickens supplemented with vitamin E were assumed to be caused by the inhibition of absorption. Fatty acids in feed after consumption will be relatively unchanged in body tissue. Lauric acid can be deposited in breast meat. Conclusion: AV as a source of natural antioxidant can be used as a supplement in broiler ration containing coconut oil as a source of lauric acid.
  Sri Suharti , Fransiscus Xaverius Shila Kurnia , Bagus Pambudi and Komang G. Wiryawan
  Background and Objective: Leucaena (Leucaena leucocephala) is one of the potential legumes that is a source of protein feed for ruminants. Leucaena has approximately 24% protein. Leucaena usage is restricted because it contains the anti-nutrient mimosine (7.19%). Mimosine causes hair loss in sheep and inhibits the action of the hormone thyroxine. The purpose of this study was to evaluate the concentration of mimosine in the blood, rumen, urine, faeces, blood metabolites and thyroid hormones of sheep fed rations containing different levels of leucaena leaf meal. Methodology: There were two kinds of treatments: P1 = Napier grass 60+15% Gliricidia sepium+15% Leucaena leucocephala+10% Pollard and P2 = Napier grass 60+30% Leucaena leucocephala+10% Pollard. This experiment used a randomized block design. The variables observed in this study were the concentration of mimosine in the blood, rumen, urine, faeces, blood metabolites and thyroid hormones. Results: The results showed that different levels of leucaena leaf meal did not have significant effects on the mimosine concentration in the rumen, blood, urine, faeces, blood metabolites and thyroid hormones. Mimosine disappearance from consumption to excretion was between 34-68%. Conclusion: The addition of 30% Leucaena leucocephala leaf meal could be used without a negative effect on blood metabolites and thyroid hormones of sheep.
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