Swine nutrition, water, environmental conditions and welfare
Compare the right inputs and outputs
Feed conversion ratio divides the defined feed input by the corresponding liveweight gain under a stated basis. Average daily gain divides a measured weight change by the elapsed time. Mortality, feed wastage, transfers and measurement errors can change interpretation. A lower numerical ratio is not proof of better welfare or profitability if growth, health or the accounting basis differs. Compare like production stages and record the actual conditions.
Match supply to biological needs
Pigs require suitable energy, amino acids, minerals, vitamins and water, with needs changing by stage and production objective. Digestible amino-acid concepts distinguish what is supplied from what is biologically available under the stated model. A percentage in a formulation cannot be interpreted without its ingredient, unit and basis. Excess supplementation is not automatically protective; imbalances and contaminants can harm animals. Feed changes can coincide with disease without establishing that every case is caused by one nutrient.
Assess water and climate as systems
Water availability depends on access, functioning equipment, flow, quality and animal demand. An apparently normal laboratory water result does not prove every drinker works. Thermal conditions, ventilation and humidity interact with animal size, stocking, activity and health. A staff member's sense of odor is not a calibrated gas measurement. Animals can be cold, overheated or exposed to poor air even when one building average looks acceptable. Investigate affected pens and time patterns rather than impose one universal environmental number.
Connect housing, behavior and disease
Tail biting and other injurious behavior have several possible contributors, including enrichment, access to resources, environment, stocking, health and management. A lesion does not prove that one factor caused every event. Provide appropriate welfare assessment and urgent care for injured animals while investigating the system. Enrichment must be genuinely usable and suitable; a named object does not guarantee effective behavior opportunities. Technical changes should have a clear expected benefit and a monitoring plan. This chapter teaches nutritional and housing mechanisms and explicitly supplied arithmetic, not universal feed recipes, stocking dimensions, temperatures or legal thresholds for every Swiss production unit.