The Improvement of Maize Cobs Quality through Soaking in Firewood Ash Filtrate and Its Impact on In Vitro Rumen Fermentability and Digestibility

Iman Hernaman, Budi Ayuningsih, Diky Ramdani, Romy Zamhir Islami


Maize cobs can be used as a ruminant’s feed, but low digestibility and its quality can be improved by soaking in firewood ash filtrate (FAF). The study aimed to test FAF treatments' effect on rumen fermentation and digestibility using a completely randomized design. Firewood ashes were obtained from Sumedang, Indramayu, and Bogor Regencies. The maize cobs were soaked by FAF at a ratio of 1:1 (w/v) for 3 hours at different concentration, i.e. 0.05 w/v (FA5), 0.10 w/v (FA10), 0.15 w/v (FA15), and 0.20 w/v (FA20). In vitro evaluation was done to measure the fermentability and digestibility of diets containing maize cobs soaked by FAF 0.20 w/v at the levels of 10% (MFA10), 20% (MFA20), 30% (MFA30), and 40% (MFA40). The results showed that firewood ash contained Calcium (Ca, 10.03%), Magnesium (Mg, 1.45%), Sodium (Na, 0.91%), and Potassium (K, 3.11%). The pH of FAF ranged from 11.46 to 12.16. The levels of neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin, cellulose, hemicellulose, and crude fiber (CF) decreased significantly (p <0.05) along with increased FAF concentration. The use of maize cobs soaked by FAF 0.20 w/v with 30% in the diets yielded the highest values of NH3, volatile fatty acids (VFA), dry matter digestibility (DMD), and organic matter digestibility (OMD) (p <0.05). The concentration of 0.20 w/v has resulted in the highest decrease in lignin content of maize cob while their uses up to 30% in the diets provided the best in vitro rumen fermentability and digestibility.


ADF; cellulose; digestibility; hemicellulose; lignin; NDF; ruminant.

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