Search strategy.

Databases searched and dates covered:	CABI: CAB Abstracts via Web of Science (1910–Jan 2023) BIOSIS Previews via Web of Science (1926–Jan 2023)
Search strategy:	CAB Abstracts: LA=(English) AND (TI=(pig OR piglet OR swine OR "sus scrofa")) AND (TS=(social* OR co-mingl*)) AND (TS=(wean* OR "early life" OR early OR "suckling pig" OR "baby pig" OR preweaning OR pre-weaning)) NOT (TS=(outdoor OR free-range)) BIOSIS Previews: LA=(English) AND (TI=(pig OR piglet OR swine OR "sus scrofa")) AND (TS=(social* OR co-mingl*)) AND (TS=(wean* OR "early life" OR early OR "suckling pig" OR "baby pig" OR preweaning OR pre-weaning)) NOT (TS=(outdoor OR free-range))
Dates searches performed:	10 Jan 2023