Pattern of feed intake and associated metabolic and endocrine changes differentially affect postweaning fertility in primiparous lactating sows.

@article{Zak1997PatternOF,
  title={Pattern of feed intake and associated metabolic and endocrine changes differentially affect postweaning fertility in primiparous lactating sows.},
  author={Louisa J Zak and John R. Cosgrove and Frank Xavier Aherne and George R. Foxcroft},
  journal={Journal of animal science},
  year={1997},
  volume={75 1},
  pages={
          208-16
        }
}
Effects of differential patterns of feed intake during lactation, associated metabolic and endocrine changes, and reproductive status after weaning were investigated in 26 primiparous sows suckled by six piglets. Sows were fed to appetite (Group AA; n = 9) from d 1 to 28 of lactation or restricted to 50% from d 22 to 28 (Group AR; n = 9) or from d 1 to 21 (Group RA; n = 8). Sow weight, backfat, and litter weights were recorded weekly. After weaning sows were tested twice daily for onset of… 
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Data from studies involving treatment with exogenous gonadotrophins or luteinizing-hormone-releasing hormone (LHRH) indicates that ovarian sensitivity is not compromised during lactation in sows, and there is still very little direct evidence for the mechanisms by which the metabolic state of lactating sows affect fertility after weaning.