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[Energy metabolism in fasting and subsequent refeeding]
Zeitschrift Fur Ernahrungswissenschaft
|March 1, 1984
Summary
Refeeding adult sows after fasting significantly increases heat production by 20%, a metabolic response that stabilizes quickly and indicates efficient energy utilization for maintenance, with no compensatory heat production observed.
Area of Science:
- Animal nutrition and metabolism
- Energy balance studies in livestock
- Physiological responses to feeding regimes
Context:
- Fasting and realimentation are critical periods influencing animal energy metabolism.
- Understanding heat production dynamics is key to optimizing feed efficiency.
- Previous research has not fully elucidated the immediate and sustained metabolic effects of refeeding post-fasting in sows.
Purpose:
- To investigate the impact of fasting and subsequent realimentation on heat production, energy retention, and energy utilization in adult sows.
- To quantify the heat increment associated with refeeding and its duration.
- To assess the efficiency of metabolizable energy utilization for maintenance following a fasting period.
Summary:
- Metabolism trials using indirect calorimetry (CN-method, RQ-method) were conducted on six adult sows during fasting and realimentation phases.
- Refeeding induced a rapid 20% increase in heat production, stabilizing within one day and persisting for over five weeks.
- Constant energy utilization efficiency for maintenance was estimated at 82%, with an overall body energy loss of approximately 5%.
Impact:
- Provides crucial data on the acute and chronic metabolic adjustments in sows to feeding strategies.
- Highlights the efficiency of energy utilization post-fasting, informing better nutritional management practices.
- Contributes to a deeper understanding of energy partitioning and metabolic regulation in swine.