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Articles by Komang G. Wiryawan
Total Records ( 2 ) for Komang G. Wiryawan
  Wulansih D. Astuti , Komang G. Wiryawan , Elizabeth Wina , Yantyati Widyastuti , Sri Suharti and Roni Ridwan
  Background and Objective: Probiotics are widely used in ruminant production, but information about the potential of Lactobacillus plantarum (L. plantarum) as a probiotic for ruminants is still limited. The aim of this research was to select L. plantarum strains as a probiotic for ruminants and to determine their effect on the rumen fermentation system. Materials and Methods: The first experiment was conducted using a randomized block design to select 14 strains of L. plantarum isolated from rumen cattle. The second experiment was arranged in a completely randomized design using two selected L. plantarum strains to determine their effects as a probiotic on rumen fermentation. The substrates used for in vitro fermentation were napier grass (Pennisetum purpureum) and concentrate in a 70:30 ratio. Results: From experiment 1, L. plantarum U32 was selected, because it produced low methane/total gas (27.39%) and strain U40 was selected because it had the highest dry matter and organic matter rumen disappearance (56.45 and 56.44%). In experiment 2, the addition of L. plantarum U32 and U40 as probiotics increased propionic acid and decreased acetic production (p<0.05), which led to a lower A:P ratio (p<0.05). The total volatile fatty acid and in vitro digestibility were not affected by the addition of L. plantarum. Probiotic addition increased lactic acid bacteria and the protozoa population (p<0.05) from the rumen fluid compared to the control. The total rumen bacteria were not significantly changed by the treatments. Conclusion: The addition of L. plantarum strains U32 and U40 as probiotics had beneficial effects for rumen fermentation due to increased propionic acid and decreased methane production.
  Yuli Retnani , Komang G. Wiryawan , Lilis Khotijah , Nisa Nurmilati Barkah , Ryza Agung Gustian and Idham Rachmat Dermawan
  Background and Objectives: Nigella sativa is the scientific name for black cumin or habbatussauda. Nigella sativa seeds contain oil commonly used for medicinal purposes to treat various diseases. Nigella sativa meal (NSM) is a by-product from the industry that extracts the oil. NSM contains a high protein content and can be used as a source of protein in the diet. The purpose of this research was to evaluate the effect of using NSM as a feed on the growth performance, metabolite and blood profile and nutrient digestibility of lambs. Materials and Methods: This study used a randomized block design with 5 replicates of 3 treatments using 15 local Indonesian male lambs. The concentrations of NSM in the rations were 0, 10 and 20%, with a maintenance period of 56 days. The forage to concentrate ratio was 30:70. Results: The average daily weight gain and blood urea nitrogen (BUN) concentration of the experimental animals were significantly (p<0.05) higher for the diets that contained 10 and 20% NSM (T1 and T2) compared to those for all other treatment groups. Additionally, the use of NSM in the diet improved the digestibility of crude protein, nitrogen retention and nitrogen use efficiency, with the mean biological value of protein being higher for the diet that contained NSM T1 (99.51) and T2 (99.44) compared to that for the control treatment group T0 (98.09). Conclusion: When the concentration of NSM reaches 20% in lamb rations, it has the most effect on growth performance and nutrient efficiency without affecting the metabolite and blood profiles, which remain in the normal range.
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