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Framework of the experimental study from gestation to growing period. Pregnant sows (12 primiparous and 12 multiparous) were housed under either PTN or PHS conditions from 9 to 109 d of gestation. Their female offspring were subjected to GTN or GHS conditions from 82 to 140 d of age. Sows during lactation and piglets during post-weaning were housed under TN conditions.
