Phosphorus supplementation in diet
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Phosphorus Supplementation in Diets: Effects on Animal Growth and Health
Phosphorus Supplementation and Growth Performance in Aquatic Species
Phosphorus supplementation in shrimp diets is essential for optimal growth, feed efficiency, and nutrient digestibility. Studies show that diets lacking inorganic phosphorus lead to poor performance and phosphorus deficiency in shrimp, while supplementation with various inorganic phosphates (such as monosodium phosphate, monoammonium phosphate, magnesium phosphate, and monocalcium phosphate) significantly improves growth, survival, and nutrient digestibility. Among these, monosodium phosphate and monoammonium phosphate provide the highest phosphorus digestibility and support the best growth outcomes, likely due to their higher water solubility. However, even less soluble sources like magnesium phosphate can still support good performance in shrimp . Additionally, phosphorus supplementation in low-fishmeal diets for Pacific white shrimp helps alleviate negative effects on gut health, immune response, and disease resistance, especially when dietary phosphorus levels are optimized. However, excessive phosphorus can potentially harm gut histology and alter gut microbiota composition .
Phosphorus Supplementation in Terrestrial Animals
In rats, phosphorus supplementation in low-protein diets restores food intake, weight gain, and energy efficiency to levels comparable to those seen with adequate protein intake. This effect is most pronounced when dietary phosphorus reaches a threshold of 0.1%, with 0.3% being optimal for mitigating the negative effects of protein deficiency on growth and metabolism . In pigs, using highly water-soluble phosphorus supplements increases phosphorus digestibility, improves growth, and reduces phosphorus excretion in manure, thereby enhancing the overall phosphorus use efficiency of the production system and reducing environmental impact .
Phosphorus and Diet-Induced Thermogenesis
Phosphorus is important for energy metabolism, particularly in high-protein diets, as it is required for ATP production. Supplementing phosphorus in a high-protein, low-phosphorus meal increases diet-induced thermogenesis, indicating a direct link between phosphorus availability and energy expenditure following protein-rich meals .
Phosphorus Supplementation in Poultry: Laying Hens and Broilers
In poultry, phosphorus is crucial for egg production, bone health, and overall performance. Supplementing diets with microbial phytase allows for the complete replacement of supplemental inorganic phosphorus without negative effects on egg production, shell quality, or bone mineralization in laying hens. This approach also improves certain egg quality parameters, such as the Haugh unit score . Similarly, in broilers, phosphorus supplementation improves growth performance and alters gut microbiota composition, with the best results seen when both phosphorus and calcium are included in the diet. Phytase supplementation further enhances phosphorus availability and reduces phosphorus excretion 689.
Recent research also suggests that current phosphorus recommendations for laying hens may be higher than necessary, as hens can adapt to lower dietary phosphorus levels, especially when phytase is included. Reducing supplemental phosphorus can promote intestinal mineral uptake and reduce environmental phosphorus excretion without compromising performance, although the response may vary by strain and age 810.
Mechanisms of Phosphorus Utilization
Phosphorus availability in the diet modulates the expression of intestinal phosphate transporters in poultry, affecting absorption efficiency. Both mineral phosphorus and phytase supplementation influence the expression of these transporters, with higher phosphorus availability generally increasing transporter expression and absorption . The adaptability of the intestinal system to changes in dietary phosphorus is also influenced by genetic factors and physiological state .
Conclusion
Phosphorus supplementation in animal diets is critical for optimal growth, nutrient utilization, and health across species. The choice of phosphorus source, its solubility, and the use of phytase enzymes all play important roles in maximizing phosphorus digestibility and minimizing environmental impact. In many cases, dietary phosphorus requirements can be met with lower supplementation levels, especially when phytase is used, supporting both animal performance and sustainability goals.
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