"Nutritional fortifier is the process of adding one or more nutrients, or some natural foods, to foods according to their nutritional needs to improve their nutritional value. Food processed by fortification is called fortification food. Added nutrients, or substances containing nutrients, are called food fortifiers. Nutritional fortifier can make up for the defects of natural food, is conducive to the balance of nutrition, but also can maintain the natural nutritional characteristics of food, but also can simplify the treatment of the diet, increase convenience.
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Feeding pigs with powder residue should pay attention
Feeding pigs with powdered slag can be a cost-effective way to reduce the use of concentrates and lower overall feeding expenses. However, it's important to follow certain guidelines when incorporating this feed into pig diets.
For fattening pigs and growing pigs, powdered slag can be included in higher amounts, typically up to 50% of the diet. However, since fresh slag has a moisture content of over 80%, it contains very little dry matter. To improve palatability and prevent digestive issues such as diarrhea, it is advisable to mix in small quantities of hay powder or sweet potato flour. The main component of slag is carbohydrates, which helps in fat deposition, making it suitable for improving weight gain in pigs when used appropriately.
On the other hand, for young pigs, boars, and pregnant sows, the inclusion level should be kept below 20%. This is because the protein content in slag is very low (around 2%), and it lacks essential amino acids like lysine, methionine, and tryptophan. Additionally, during processing, many nutrients such as calcium and water-soluble vitamins from sweet potatoes are lost. Feeding too much slag to young pigs may hinder their growth, while overfeeding boars could negatively impact sperm quality. In pregnant sows, excessive slag consumption might lead to stillbirths, birth defects, or reduced milk production after farrowing.
To ensure balanced nutrition, it’s crucial to supplement the diet with protein sources such as fishmeal, soybean meal, blood meal, and mineral supplements like bone meal, shell powder, and limestone. Including Vitamin-rich ingredients like carrots can also help compensate for the nutritional deficiencies in slag. By combining these elements, farmers can enhance the overall nutritional value of the feed, promote better health, and improve economic returns.