The application of ferric phosphate in feed, particularly as a feed-grade additive, typically refers to ferric phosphate. Whether it can effectively enhance the utilization and nutrient absorption of feed by animals can be analyzed from the following aspects:

I. Functions  

1. Improvement of Feed Utilization Efficiency:  

Appropriate amounts of feed-grade ferric phosphate can improve the energy utilization rate and efficiency of feed.  

2. Enhancement of Nutrient Absorption:  

Feed-grade ferric phosphate can improve the nutrient absorption of animals, especially regarding iron-related nutrient uptake.  

3. Boosting Immune Function:  

Adequate ferric phosphate supplementation can promote immune function in animals, thereby improving overall health.  

4. Promotion of Growth and Development:  

By improving nutrient absorption and feed utilization, feed-grade ferric phosphate contributes to the growth and development of animals.  

II. Dosage and Safety  

1. Dosage Standards:  

According to the *Feed Additive Use Standards* (GB 13078-2017), the addition of feed-grade ferric phosphate should adhere to national and industry standards, generally not exceeding 2% of the total iron content in feed.  

2. Hazards of Overuse:  

Although ferric phosphate is beneficial to animals, excessive use can lead to iron toxicity, manifested by symptoms such as loss of appetite, indigestion, vomiting, diarrhea, and skin redness.  

III. Other Applications  

Apart from being a feed additive, ferric phosphate also has other applications, such as serving as an insecticide against snails, slugs, and other mollusks. These mollusks are more sensitive to ferric phosphate than other organisms. When they ingest ferric phosphate, it disrupts calcium metabolism in their gut, causing them to cease feeding almost immediately and die within three to six days.  

Feed-grade ferric phosphate, when added in appropriate amounts, can effectively enhance the utilization and nutrient absorption of feed by animals. However, strict control of dosage is essential to avoid the adverse effects of overuse. Additionally, attention should be paid to its stability in feed and interactions with other components to ensure optimal effectiveness.  

Although ferric phosphate is beneficial to animals, its specific use should be tailored based on the animal species, growth stage, and feed formulation, with comprehensive considerations and reasonable adjustments.