Potential and Strategy Analysis of Oil Palm Decanter Cake as Cattle Feedstuff for Animal-Protein Food Security in Sintang Regency, Indonesia

In the lush, humid landscapes of Indonesia, the palm oil industry is a massive engine of economic activity, but it also generates a significant amount of leftover material. When fresh palm fruit is processed to extract oil, the machinery separates the liquid oil from the solid remains. One of these solid leftovers, known as oil palm decanter cake, is a wet, heavy mixture of fiber, residual oil, and protein. For decades, this material has often been treated as waste or simply spread on fields, yet it sits right next to a different industry that is hungry for resources: cattle farming. In many parts of Indonesia, raising beef cattle is difficult because farmers struggle to find affordable, high-quality feed, which makes up the bulk of their costs. The core idea behind this research is simple but powerful: could this wet by-product from the palm oil mills be turned into a reliable meal for cows, thereby solving a feed shortage while creating a new source of meat for local communities?

A team of researchers from Universitas Gadjah Mada traveled to Sintang Regency, a district in West Kalimantan known for its vast palm oil plantations, to investigate this possibility. They did not just look at the numbers on paper; they went into the mills, the fields, and the storage sheds to understand the reality of the situation. Their goal was to determine if this specific waste product could actually support a large number of cattle, how much beef it could help produce, and what obstacles stood in the way of making it a standard practice. The study combined hard laboratory science with a detailed look at the local geography and the people involved, painting a complete picture of what is technically possible versus what is practically achievable.

The researchers began by checking the technology used in the eleven palm oil mills across the region. They discovered that only four of these mills used a specific type of machine called a three-phase decanter, which is necessary to produce the solid cake they were studying. The other seven mills used different equipment that did not create this solid by-product. From the four active mills, the team collected samples and measured exactly how much material was being produced. They found that these four facilities generated nearly 29 million kilograms of the wet cake every year. This was a substantial amount, but the researchers knew that the weight of the water in the cake was a major problem. To understand what the cattle would actually be eating, they dried the samples in a lab and analyzed their nutritional content. The results were promising: the dried material contained about 16.5 percent protein, along with significant amounts of fiber and energy. In fact, when tested in a laboratory simulation of a cow's stomach, the organic parts of the cake were highly digestible, meaning a cow could break down and use most of the nutrients it contained.

However, the laboratory results told only half the story. The researchers then turned their attention to the real-world behavior of this wet material. They placed fresh samples in an open, sheltered room and watched them closely for nine days. What they observed was a rapid decline in quality. Within just three days, visible spots of mold began to appear on the surface. By the end of the week, the material had developed strong odors and was covered in colonies of white, yellow, and green growth. The temperature of the pile rose, and its chemical makeup shifted, becoming more alkaline. This observation confirmed a critical constraint: if farmers tried to store this wet cake in the open without drying it first, it would spoil quickly and could become unsafe or unpalatable for the animals. The high water content also meant that transporting it over long distances would be inefficient, as farmers would be paying to ship water rather than food.

To solve the puzzle of how to get this feed from the mills to the farmers, the team mapped out the entire region. They calculated a score for each of the fourteen subdistricts based on three factors: how much cake was produced nearby, how many cattle lived there, and how far the farmers were from the mills. The map revealed a clear divide. Two subdistricts, Binjai Hulu and Ketungau Hilir, were located right next to the mills and had good road access, making them ideal for using the fresh or slightly dried cake. Another area, Sungai Tebelian, did not produce the cake itself but was centrally located, making it a perfect spot for a central storage hub where the material could be processed and distributed. In contrast, more remote areas were too far away to receive the wet product; for those farmers, the cake would need to be fully dried or turned into a meal before transport.

Using these findings, the researchers ran a simulation to see what would happen if this system were fully implemented. They assumed that the available dried cake could be collected and fed to cattle over a 300-day period. Under these conditions, the amount of feed produced could theoretically support more than 20,000 cattle. If these animals were raised for beef, the simulation suggested they could produce over 4.5 million kilograms of meat. This volume of beef would be enough to provide nearly 38 percent of the animal protein required by the entire population of the region. This is a significant contribution, suggesting that the waste from the palm oil industry could play a major role in local food security.

Despite the high potential, the study made it clear that this is not a problem that can be solved overnight. The researchers identified several hurdles that must be cleared before this system can work on a large scale. The most immediate issue is the need for moisture reduction; the cake must be pressed or dried at the mill to prevent it from rotting during transport. There is also a lack of formal agreements between the mill owners and the farmers, which creates uncertainty about supply and price. Farmers are currently accustomed to buying established feed ingredients like palm kernel meal, which have a stable market and consistent quality. Convincing them to switch to a new, variable product will require proof that it is safe, affordable, and effective. The study also noted that while the nutritional value is high, the ash content is also high, meaning the cake should be mixed with other feeds rather than given as the only food source.

The path forward, according to the researchers, involves a step-by-step approach rather than a sudden, massive expansion. They recommend starting with pilot projects in the areas closest to the mills, where the logistics are easiest. In these areas, mills and farmers could sign contracts to supply the cake, while small-scale drying units could be set up to stabilize the product. Once the quality is consistent and the farmers see that their cattle thrive on the feed, the system could expand to include regional hubs and more distant areas. The ultimate goal is to create a circular system where the waste from the palm oil industry feeds the cattle, and the manure from the cattle fertilizes the palm trees, creating a sustainable loop that boosts local food production. The potential is there, but it requires careful management, better infrastructure, and trust between the different players in the chain to turn a wet by-product into a reliable source of food security.