Enrichment for Gestating Sows
The welfare of gestating sows in group housing systems depends critically on the quality and quantity of enrichment provided. Without adequate enrichment, sows in confined systems develop stereotypies, show signs of chronic frustration, and have compromised welfare throughout pregnancy.
The Rooting Imperative
Rooting is a fundamental porcine behaviour — the instinct to push the snout into substrate and manipulate materials is extraordinarily strong in all pigs. In sows, this motivation is particularly intense during gestation and pre-farrowing (nest-building). Providing materials that allow rooting expression is not a luxury but a welfare requirement.
Effective rooting substrates include straw, hay, hessian sacks, compost, peat, and deep shavings. Materials must be manipulable, partly destructible, and renewed regularly. Novelty significantly increases engagement — introducing new materials or objects regularly maintains behavioural interest.
Cognitive Enrichment
Sows are highly intelligent animals capable of learning complex tasks. Cognitive enrichment — puzzles requiring problem-solving to obtain food rewards — has been shown to improve welfare indicators and reduce aggression in group-housed sows. Even simple modifications (hiding food in substrate requiring searching, presenting food in novel containers) provide meaningful stimulation.
The positive affect associated with successful problem-solving appears to confer lasting welfare benefits beyond the duration of the enriching activity itself.
Social Management
Group housing provides social stimulation but also creates aggression risk, particularly when sows are mixed or resources are limited. Providing multiple feeding stations, adequate lying space, and visual barriers that allow subordinate animals to escape dominant ones reduces chronic social stress.
Stable group composition (avoiding mixing after initial establishment) dramatically reduces aggression. Where mixing is unavoidable, providing extra space and enrichment during the mixing period reduces injury risk.
Exercise and Space
Dynamic group systems with large exercise areas provide more comprehensive welfare than static groups in confined pens. Sows that can walk, trot, and move freely show better leg health, reduced obesity, and improved farrowing outcomes. Minimum EU space requirements (1.64-2.25 m² per sow depending on group size) are welfare floors, not optimal targets.