Phosphorus in pig nutrition
Abstract
In order to reduce P excreted by pigs, P dietary supply should be better adjusted to their requirements and strategies to improve P availability should be implemented. A feeding system relying on P apparent digestibility is proposed. The impact of the proportion of phytic P in total P and of plant and microbial phytase on P digestibility was quantified. Apparent digestibility was a more efficient approach than total P to formulate pig diets, even if the impact of other known factors of variation of P digestibility remains to be quantified. The bases for the factorial determination of apparent digestible P requirements by weaned piglets, fattening pigs and lactating and gestating sows according to their characteristics and performance were updated. A reduction of P supply to sows is still possible, but new experimental data regarding the management of bone stores throughout lactation and gestation are required.
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