When does the mature sow require the least amount of nutrients?

The mature sow requires the least amount of nutrients during gestation. During this period, while the sow is pregnant, her nutrient demands are lower compared to other phases such as lactation or during the heat cycle.

In gestation, the primary focus for the sow is to maintain her own body condition and support fetal development without excessive nutrient needs, which can lead to unnecessary weight gain or complications. Nutritional requirements during gestation are typically centered on maintaining health and preparing the sow for the increased demands that will come later during lactation, where nutrient demands are significantly higher due to milk production for the piglets.

Lactation requires a high energy and nutrient intake to support milk production, while the heat cycle can also involve increased nutritional needs due to hormonal changes and the preparation for potential mating. Weaning involves recovery from lactation, which again increases the nutrient needs of the sow. Thus, gestation represents a time where nutrient requirements are at their lowest compared to these other stages.