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Articles by M. Hafil Abbas
Total Records ( 2 ) for M. Hafil Abbas
  Zurmiati , Wizna , M. Hafil Abbas , Maria Endo Mahata and Revan Fauzano
  Background and Objective: Live probiotic feed additives can balance microorganism populations in the digestive tract. This study aimed to investigate the effects of the probiotic Bacillus amyloliquefaciens on growth performance and feed efficiency of Pitalah starter ducks. Methodology: A completely randomized design was used in this study. Three different doses of B. amyloliquefaciens (1000, 2000 and 3000 ppm) were dispensed in the drinking water of 1 day old Pitalah ducks (N = 25 duck per dose) and each treatment was replicated five times, control birds were given 0 ppm (N = 25 duck). Feed consumption and conversion, body weight gain, income over feed cost, total colony count of Bacillus sp., in the small intestines and acidity in small intestine were measured. Results: The results showed that all three doses significantly decreased feed consumption, feed conversion and small intestinal acidity (p<0.05) and increased income over feed cost and total small intestinal Bacillus sp., colony counts. There was non significant change in weight gain (p>0.05). Conclusion: It is concluded that addition of 2000-3000 ppm of B. amyloliquefaciens to the drinking water of Pitalah ducks can improve the feed efficiency by >15% and provide economic benefits for farmers raising starter ducks.
  Zurmiati , Wizna , M. Hafil Abbas and Maria Endo Mahata
  Background and Objective: Mannanase is a decomposer of the compound mannan, which is produced by many microorganisms including bacteria. This enzyme can be utilized in various industrial processes, such as in the animal feed industry to increase the nutritional value of the feed. This study aims to optimize the production and function of the mannanase enzyme, which is produced by Bacillus amyloliquefaciens on a coconut waste substrate. Methodology: This study was designed in the form of laboratory experiments described herein and repeated 3 times. The substrate dose, incubation time, optimum pH and temperature of the mannanase enzyme were measured. Results: The results of this study showed that the best conditions were a substrate ratio of 80% coconut waste to 20% tofu waste, a 48 h incubation time, a pH of 6.5 and a temperature of 40°C yielding a mannanase enzymatic activity of 5.13 U mL–1. When locust bean gum was added to the substrate composed of coconut and tofu waste, the best conditions were a dose of 0.6%, a 48 h incubation time, a pH = 6.5 and a temperature of 40°C yielding a 5.92 U mL–1 mannanase enzymatic activity. Conclusion: It is concluded that the activity of the mannanase enzyme with the substrate composed of coconut and tofu waste is not much different from that with the substrate containing locust bean gum, with the difference being only 13.34%.
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