Reproductive seasonality in domestic sows kept outdoors without boars.

@article{Bassett2001ReproductiveSI,
  title={Reproductive seasonality in domestic sows kept outdoors without boars.},
  author={John M Bassett and Christopher Bray and Cicely Sharpe},
  journal={Reproduction},
  year={2001},
  volume={121 4},
  pages={613-29}
}
Plasma progesterone, LH and prolactin concentrations were measured twice a week in mature sows kept outdoors without boars in two experiments to examine whether perception of daylength change underlies seasonal infertility in domestic pigs. In Expt 1, melatonin implants inserted on 12 April or 22 May to block perception of the increasing daylength did not affect the oestrous cycle significantly, since only two untreated control sows became seasonally anoestrous. In Expt 2, all control sows… CONTINUE READING

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