Effect of Non-Fiber Carbohydrate Sources with Formaldehyde Protected Soybean on in vitro Fermentability and Digestibility

Salwa Zahidah Arif, Lu’lu’ Salsabila, Annisa Rosmalia, Idat Permana, Despal and Dwierra Evvyernie

Background and Objective: An optimal ratio of rumen degradable protein (RDP) and rumen undegradable protein (RUP), synchronized with energy availability and sulfur supplementation in a dairy ration, has been shown to enhance cow productivity. The research studied the influence of formaldehyde-protected soybean, corn (CO) and cassava meal (CM) non-fibre carbohydrate (NFC) and Na₂SO₄ supplementation on the fermentability and digestibility of dairy cattle rations. Materials and Methods: The experimental rations consisted of two types of NFC sources (CO and CM), each combined with soybean (SS), formaldehyde-protected soybean (PS) and formaldehyde-protected soybean with sulfur (PSS). Ration without soybean (WS) was used as a control. All types of rations have been tested for their fermentability, including pH, ammonia, total Volatile Fatty Acids (VFA), protozoa and rumen microbe analysis. Additionally, dry matter and organic matter digestibility (DMD and OMD) were assessed. The treatments were replicated four times. Results: The inclusion of NFC, protected soybean and sulfur supplementation in the ration did not have a significant effect (p>0.05) on pH, ammonia concentration, rumen bacteria, protozoa population and digestibility. However, the total VFA increased significantly in the CM rations combined with soybean compared to WS and CO rations. Conclusion: Adding cassava NFC, formaldehyde-protected soybean and Na₂SO₄ supplementation improved total VFA production while maintaining other fermentability and digestibility.

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