The optimal nursery environment encompasses temperature, physical, and social components. Big Sky Farms are worried about temperature control (they go from 29.0 to 19.0 degrees C) and ventilation (pigs start off with 1.5 to 1.7 cubic feet per minute up to 1.7 to 2.0 cfm). Day one is important for the piglets due to the weaning stress. To minimize this stress, it is ensured that temperatures are comfortable for the piglets, piglets are sorted by size for equal competition, they are creep fed adequately, feeders are set correctly, and provide a night light. Nursery pigs are to not be stocked at less than 2.8 square feet per pig from 5 to 24 kg, and no less than 3.2 square feet per pig from 25 to 32 kg. High standards of hygiene (washing and disinfection) are enforced to avoid a build-up of pathogenic bacteria. The piglets are fed 4 different rations throughout the nursery phase in order to increase the piglet quality that is coming out of the nursery.