Rooting is one of the most fundamental behavioral drives in pigs, consuming up to 7 hours of their day in natural settings, yet it is almost completely prevented in most intensive farming systems.
The deprivation of rooting opportunity in barren pig housing creates a state of chronic behavioral frustration that is now well documented in welfare science. Pigs deprived of substrate show repetitive vacuum rooting behaviors that develop only in environments where natural behavior is systematically prevented. The movements represent the expression of a drive that has no outlet. The provision of straw transforms pig welfare by allowing this fundamental drive to be expressed. The resistance to straw in slatted floor systems is primarily practical and economic rather than welfare-based - manure management is more complex with bedding. This economic barrier is not a sufficient justification for the chronic behavioral deprivation experienced by billions of pigs globally.