How do pigs deal with dietary phosphorus deficiency?

Area of Science:

• Animal Nutrition
• Environmental Science
• Biochemistry

Background:

• Maximizing livestock performance while minimizing environmental phosphorus (P) load is crucial.
• Existing knowledge gaps concern P's effects on feed intake, body composition, and internal P distribution in pigs.
• Accurate P retention prediction is vital for effective feeding strategies.

Purpose of the Study:

• To address knowledge gaps in pig P nutrition by analyzing empirical data and developing a predictive model.
• To investigate the impact of P-deficient feeds on pig responses.
• To enhance understanding of P utilization, retention, and excretion in monogastric livestock.

Main Methods:

• Statistical analysis of published literature data on P feeding strategies.
• Development of a mechanistic model for predicting P utilization and retention.
• Evaluation of P-deficient feed effects on feed intake, body composition, and P distribution.

Main Results:

• Lower P feed content did not affect feed intake in pigs.
• The relationship between body ash and protein is influenced by feed composition.
• P retention prioritizes soft tissues over bones.

Conclusions:

• Reduced P feeding recommendations may be feasible without compromising average daily gain.
• Lower P diets could impact P deposition in bones.
• This research contributes to more accurate P feeding guidelines and reduced environmental P excretion.