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Articles by K.G. Wiryawan
Total Records ( 8 ) for K.G. Wiryawan
  R.K. Rusli , K.G. Wiryawan , T. Toharmat , Jakaria and R. Mutia
  This research aims to study the effects of mangosteen pericarp meal (MPM) and vitamin E (VE) on the performance, blood profile, antioxidant enzyme and HSP 70 gene expression of laying hens in tropical environment when supplemented in their diets. In this study, 160 laying hens of Lohman strains were used; they were 24 weeks old and were observed for 11 weeks. They were arranged in a completely randomized design with four treatments and four replications (10 birds each). The treatments consisted of R0 (control diet), R1 (R0+1 g MPM/kg rations), R2 (R0+2 g MPM/kg rations) and R3 (R0+200 mg VE/kg rations). The data were analyzed using analysis of Variance (ANOVA); if there was any significant difference among the treatments, further tested was done using Duncan Multiple Range Test. The results showed that supplementation of MPM and VE in the diet of the hens significantly (p<0.01) increased the activity of the antioxidant enzyme superoxide dismutase (SOD) and decreased the thiobarbituric acid reactive substances (TBARS) values. Supplementing the hens’ diet with MPM and VE did not affect (p>0.05) their performance, blood profile and HSP70 gene expression. It is concluded that supplementing the diets of the laying hens with MPM and VE increased the activity of SOD and decreased TBARS values of yolk.
  Sumiati , A. Darmawan and K.G. Wiryawan
  Objective: The aim of this study was to investigate the effect of feeding diets containing different amounts of omega-3 and omega-6 fatty acids and organic zinc on egg quality and blood hematology. Methodology: Ninety Magelang laying ducks of 21 weeks old were randomly divided into 18 experimental units in a completely randomized design with 6 treatments and 3 replications. The treatment diets included the following: R0 = Diet without palm oil, fish oil or organic zinc with ratio of 1:5 omega-3 and omega-6, R1= Diet with ratio of 1:1.5 omega-3 and omega-6+200 ppm organic zinc, R2 = Diet with ratio of 1:3 omega-3 and omega-6+200 ppm organic zinc, R3 = Diet with ratio of 1:4.5 omega-3:omega-6+200 ppm organic zinc, R4 = Diet with ratio of 1:6 omega-3 and omega-6+200 ppm organic zinc, R5 = Diet with ratio of 1:7.5 omega-3 and omega-6+200 ppm organic zinc. Results: The R2 treatment decreased significantly (p<0.01) yolk cholesterol but the highest value of vitamin A was resulted by R5. The best ratio of omega-3 and omega-6 was produced by R2 (1:3.4). The R1 treatment resulted the lowest heterophil to lymphocyte ratio. Conclusion: Conclusively, feeding diets with ratio of omega-3:omega-6 fatty acids of 1:3+200 ppm organic zinc produced the best ratio of omega-3:omega-6 in yolk as well as increased vitamin A content, decreased yolk cholesterol content and did not interfere ducks physiologically.
  Asnawi , A.S. Dradjat and K.G. Wiryawan

Objective: This study was conducted to evaluate the effect of sapu-sapu fish (Hypostomus plecostomus) as substitute of commercial feed on the production performance and eggs quality of Mojosari ducks. Materials and Methods: A total of 100 Mojosari laying ducks were distributed randomly into four dietary treatments with five replicates of five ducks. The treatments were P0 (mixture of 80% rice bran and 20% commercial feed), P1 (mixture of 90% rice bran and 10% sapu-sapu fish), P2 (mixture of 80% rice bran and 20% sapu-sapu fish), P3 (mixture of 70% rice bran and 30% sapu-sapu fish). Results: The results showed that the average weight gain during three month feeding trial for P2 and P3 were 136.6±41.78 g and 101.7±92.78 g which were significantly (p<0.05) higher than P0 and P1 which were 72.6±20.58 g and 46.9±33.07 g. Egg production of ducks fed on P0, P2 and P3 diets were 47.2±7.33%, 45±9.0% and 41±5.2% respectively, which was significantly (p<0.05) higher than those given P1 diet. The feed conversion ratio, egg weight and egg index were not affected by dietary treatments. While yolk color of ducks fed on P0 was 10.56±0.932 which was significantly higher than those fed on P1, P2 and P3. The egg and meat cholesterol of the ducks fed diet containing sapu-sapu fish was lower than those offered commercial feed (p<0.05). Conclusion: It was concluded that sapu-sapu fish can substitute up to 20% of commercial feed.

  M. Prayuwidayati , T.C. Sunarti , Sumardi , Subeki and K.G. Wiryawan
  A series of experiment had been done to evaluate the use of purified lignin formacell (PLF) and its derivative (MIL and MSL) as feed supplement and prebiotics candidate for ruminant. PLF was isolated from empty bunch palm fiber. First experiment was microbial test using PLF, MIL and MSL as substitute of glucose in medium. Six treatments were applied and growth of Lactobacillus casei, Lactobacillus bulgaricus and Streptococcus thermophillus were measured. Second experiment was also microbial test using PLF, MIL and MSL as substitute of yeast extract in medium. Six treatments were applied and growth of Escherichia coli, Salmonella typhimurium and Staphylococcus aureus were measured. Third experiment was in vitro test using fresh rumen liquid to study the following treatments: R0 = basal diet; R1 = R0 + 1.25% of Inulin; R2 = R0 + 1.25% of PLF; R3 = R0 + 1.25% of MIL and R4 = R0 + 1.25% of MSL. Microbial test showed that PLF, MIL, or MSL could substitute the glucose in the medium as carbon sources for the growth of lactic acid bacteria; whereas PLF, MIL, or MSL could not be used as carbon sources in the medium for growth of the pathogenic bacteria. In vitro rumen fermentation revealed that the addition of PLF, MIL, or MSL has positive effects on rumen metabolism parameters. Higher ammonia was achieved by MIL and MSL; higher rate of microbial protein synthesis was achieved by PLF and MIL and higher crude fiber digestibility was achieved by MIL and MSL.
  A.M. Fuah , R. Priyanto , S. Suharti , K.G. Wiryawan and M. Ismail
  The main problems behind low productivity of beef cattle raised by farmers in the villages are the less sufficiency of feed resources and low quality of feed available for the animals, especially the deficiency of protein/nitrogen and low feed intake. This study was aimed to improve the productivity of local cattle in Indonesia through the utilization of soybean meal and its wastes as the main protein source. Twelve heads of Madura cattle with an average initial live weight of 175.64±16.4 kg and ages between I1-I2 (18-30 months) were used in the study. The cattle were allotted into four feeding treatments i.e., T0 as control (100% native grass); T1 (40% roughage 60% concentrate); T2 (complete feed with 15% soybean pods) and T3 (complete feed with 30% soybean pods, for three months. The observed parameters included cattle performance (final weight, average daily gain, feed consumption and feed conversion), carcass quality (backfat thickness, loin eye area and meat color) and physical quality of meat (pH, water holding capacity, cooking loss and meat tenderness). The results showed that cattle fed soybean wastes (T1, T2 and T3) were higher in all variables of cattle performance and backfat thickness compared to those fed control feed. Utilization of feed combined with soybean waste could improve cattle performance with relatively better meat quality than those given grass only.
  I. Martaguri , P.D.M.H. Karti , K.G. Wiryawan , R. Dianita and L. Abdullah
  Background: Beside as a source of energy for ruminants, grasses have been identified having a capacity as carbon storage. Axonopus compressus is a grass species that mostly found under shade condition of palm plantations and are easily adaptable with the ecosystem. As a part of the ecosystem, the grass would always carry on photosynthesis even under shade condition as encountered by Axonopus compressus. Thus, it might play an important role in storing carbon. Methodology: Therefore, in this study the capability of this grass in storing carbon were investigated including carbon storage dynamics, nitrogen content, C/N ratio and biomass production. In advanced, carbon and nitrogent content of soil were also studied. A completely randomized design was utilized as experimental design with different grass age of 10, 20, 30, 40, 50 and 60 days as the treatments. Results: Results indicated that grass age influenced significantly all parameters except carbon and nitrogen content as well as the C/N ratio of soil. Furthermore, it was also revealed that there is a dynamic of carbon storage in leaf, stemp and root of the grass. Conclusion: The capacity of the grass in storing carbon increased with increasing plant age.
  Malcky Telleng , K.G. Wiryawan , P.D.M.H. Karti , I.G. Permana and L. Abdullah
  Background: Intercropping involves growing two or more crops on the same piece of land to produce rations for livestock, particularly ruminants. In this study, the silage quality of in situ rations produced from Sorghum intercropped with Indigofera was evaluated to determine which Sorghum variety produced the best silage. Methodology: The pH, Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), ammonia-N (N-NH3), Volatile Fatty Acids (VFA) and total bacteria in silage for use in situ rations were verified. Experiments were conducted using a Completely Randomized Design (CRD) with three replications of three factors: (1) Sorghum variety (Patir-37 and Citayam-33), (2) Indigofera composition (30, 40 and 50% Indigofera ) and (3) Microbial inoculant (Lactobacillus plantarum, Lactobacillus casei and non-microbial inoculant). Data were analyzed using analysis of variance and HSD test. Results: For all rations tested, the pH and N-NH3 values indicated good ensilage. Rations that included the Sorghum variety Citayam-33 had lower pH and N-NH3 production relative to those with Patir-37. In whole crop silages, the inoculants did not significantly affect fermentation. Meanwhile, rations with higher amounts of Indigofera (up to 50%) had lower NDF and ADF. Conclusion: Together the results show that in situ rations made from intercropped Sorghum and Indigofera ensilage well and different compositions can be obtained directly from intercropped fields to produce rations that improve ruminant performance.
  M. Sobri , K.G. Wiryawan , P.D.M.H. Karti and W.T. Wibawan
  Background and Objective: This study was conducted to analyze the effect of the neutral detergent fiber (NDF) and fiber particle size on mortality, hematology, stress status, immunity and number of E. coli in New Zealand white (NZW) crossbred rabbits during the postweaning period. Methodology: A total of 144 NZW crossbred rabbits were used in the study. The trial design was a completely randomized 3×3 factorial pattern, namely, 3 levels of the concentration of neutral detergent fiber (NDF) (F1, F2 and F3) and 3 sizes of fiber particles (P1, P2 and P3). Each treatment was repeated 4 times and each replication consisted of 4 trials. Results: The average mortality up to 12 weeks was 19.44%. The treatment combinations of F3P2 and F2P2 had the lowest mortality rate (0%) and low rates of E. coli infection at 2.55 and 2.71×109 CFU mL1, respectively. The feed treatment affected the hematological values in rabbits during the postweaning period. The results indicated that there was a relationship between mortality and E. coli infection. Moreover, the F3P2 treatment was the best feed combination observed in this study. Conclusion: The feed treatment affected the mortality, immunity, hematology and stress status of NZW crossbred rabbits during the postweaning period.
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