Fermentation Characteristics and In Vitro Nutrient Digestibility of Fermented Corn Cob-Based Feed Supplemented With Soybean Oil Calcium Soap Using Rumen Fluid of Etawa Crossbreed Goats
Fermentation Characteristics and In Vitro Nutrient Digestibility of Fermented Corn Cob-Based Feed Supplemented With Soybean Oil Calcium Soap Using Rumen Fluid of Etawa Crossbreed Goats
Ali Bain*, Musriah, La Ode Nafiu, La Ode Muh. Munadi, La Ode Muhsafaat, Nur Santy Asminaya, Astriana Napirah, Widhi Kurniawan, Fuji Astuty Auza, Deki Zulkarnain
ABSTRACT
This study aimed to evaluate the fermentation characteristics and in vitro nutrient digestibility of feed based on the fermented corn cob supplemented with soybean oil calcium soap (CaS-soybean oil) using microbial rumen fluid of Etawa crossbreed goats. The experimental trial consisted of five treatment rations with four replicates arranged in a randomized block design. The treatment rations were a mix of 60% concentrate (25% fermented corn cobs and 75% agricultural by-products) and 40% forage supplemented with different levels of CaS-soybean oil (0%, 1.5%, 2.5%, 3.5% and 4.5%). The measured research parameters were (i) fermentation characteristics (pH, NH3-N and total volatile fatty acid (VFA)), (ii) nutrient digestibility (dry matter digestibility (DMD), organic matter digestibility (OMD), crude fiber digestibility (CFD) and crude protein digestibility (CPD)). The results showed that fermented corn cob-based rations supplemented with CaS-soybean oil at different levels significantly (P<0.01) affected fermentation characteristics and ration nutrient digestibility. The different levels of CaS-soybean oil (1.5%-4.5%) produced optimal fermentation characteristics (pH, NH3-N and total VFA) to support the growth and activity of microorganisms to optimally digest nutrients during in vitro incubation. Supplementation of 4.5% CaS-soybean oil in the fermented corn cob-based rations resulted the best NH3-N levels and total VFA production, followed by the highest nutrient digestibility (DMD, OMD, CPD and CFD) compared to the other treatments. The study concluded that rations based on fermented corn cobs and other agricultural by-products supplemented with 4.5% CaS-soybean oil produced ideal fermentation characteristics to support optimal growth and activity of microorganisms digesting feed nutrients.
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