Burial Pit Method: To prepare the burial pit, consider its size and capacity, and line it with materials like rapeseed cake, plastic film, or mats. Crushed rapeseed cake should first be soaked in water at a ratio of approximately 1:1. Once soaked, place the mixture into the pit, ensuring around 500-700 kilograms of rapeseed cake per cubic meter. After filling, cover the pit with grass or plastic film, and press down with about 20 centimeters of soil. It will be ready for feeding after two months. Ammonia Treatment: For every 100 parts of rapeseed cake, add 7 parts of 22% aqueous ammonia. Evenly spray this mixture over the cake, then cover and let it sit for 3 to 5 hours. Next, steam the treated cake for 40 to 50 minutes before frying or drying it further. Alkali Treatment: Mix 100 parts of rapeseed cake with 24 parts of a 14.5% to 15.5% sodium hydroxide solution. The rest of the procedure follows the ammonia treatment method. Washing Method: Fill a tank with water and add crushed rapeseed cake at a ratio of 1:6 (cake to water). Let it soak for a day, then filter the water. Repeat this process twice more using the same proportions. The cake is then ready to be fed. Alternatively, you can use hot water—80°C in winter and 50-60°C during other seasons—at a ratio of 1:4 (cake to water), maintaining a water temperature of around 40°C. In summer, soak for two days; in winter, soak for longer. Afterward, rinse the cake twice with clean water before feeding. In the field of animal husbandry, these methods are widely used to improve the nutritional value of rapeseed cake while reducing potential anti-nutritional factors. Each technique has its unique advantages and is chosen based on availability, cost, and specific requirements. These processes not only enhance the quality of feed but also contribute to sustainable agricultural practices by maximizing resource utilization.
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