Twelve Large White × Landrace castrated male pig-lets from six litters were used in this study. The piglets
were castrated at approximately 10 d of age. The six
litters were weaned simultaneously at 28 ± 1dofage
and had an average body weight of 9.1 ± 1.1 kg. The
piglets were initially raised in a conventional nursery.
They were weighed 3 wk after weaning, and within