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Review: Piglets' (Re)Feeding Patterns, Mineral Metabolism, and Their Twisty Tail
Theo van Kempen1, Eugeni Roura2
1Animal Science Department, North Carolina State University, Raleigh, NC 27695-7621, USA.
Metabolites
|July 25, 2025
Summary
Refeeding young animals after fasting, especially with high-glycemic feeds, can cause critical mineral deficiencies like phosphate deficiency. Adjusting diets to lower glycemic load and meet actual needs is crucial for preventing refeeding syndrome in piglets.
Area of Science:
- Animal Nutrition
- Metabolic Physiology
- Veterinary Medicine
Background:
- Nutrient absorption impacts hormones like insulin, influencing growth and mineral requirements (phosphate, magnesium, potassium).
- Fasting downregulates metabolism, leading to mineral excretion; abrupt refeeding can cause deficiencies, akin to human refeeding syndrome.
- Young, rapidly growing animals are particularly susceptible due to their high metabolic rate and insulin response.
Purpose of the Study:
- To highlight the risks of refeeding syndrome in young animals, particularly piglets, due to mineral deficiencies.
- To identify the specific challenges posed by phosphate deficiency in post-weaning piglets.
- To recommend dietary strategies for preventing adverse effects associated with refeeding after fasting.
Main Methods:
- Review of metabolic and hormonal responses to nutrient intake and fasting in young animals.
- Analysis of the physiological consequences of phosphate, magnesium, and potassium imbalances.
- Examination of clinical signs associated with mineral deficiencies in piglets, such as edema and hypoxia.
Main Results:
- Refeeding after fasting, especially with high-glycemic diets, acutely increases demand for minerals like phosphate, potentially leading to deficiency.
- Phosphate deficiency symptoms are often non-specific, including edema, hypoxia, hypercarbia, and potentially triggering infections or rhabdomyolysis.
- These deficiencies can mask poor intake and contribute to health issues like ear necrosis and tail-biting in piglets.
Conclusions:
- Dietary strategies for newly weaned piglets should focus on lowering glycemic load to mitigate refeeding syndrome risks.
- Formulating diets based on actual nutrient requirements, considering genuine intake and health status, is essential.
- Avoiding extrapolation from older animals' requirements and prioritizing metabolic health is key for young, growing animals.
