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(a) Meta-analysis examining mean farrowing duration: pooled analysis [9,10,11,12,13,14,15,16,17,18,19,20,21,28,30,31,33]. (b) Meta-analysis examining mean farrowing duration: sub-group analysis by study objective (induction program and farrowing assistance [29,30,31,32,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,50,51,53].
