The objection of this study was to determine whether sow milk leptin at farrowing was related to neonatal serum leptin and pig growth to weaning. It was concluded that for all pigs’ serum leptin concentrations were not affected by sex of the pig. Milk serum leptin was not associated with litter size, parity, pig birth weight, ADG to weaning or weaning weight. Suckling status did not influence average daily gain (ADG)to weaning or weaning weight of pigs; neonatal pig serum leptin was not related to birth weight, weaning weight, or ADG to weaning. This indicates that leptin is not directly related to early neonatal growth in the pig, but more indepth studies are needed.

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