Opioid Modulation of Follicle Stimulating Hormone (FSH) and Prolactin (PRL) Secretion in the Postpartum Sow

  • C. R. Barb
  • R. R. Kraeling
  • G. B. Rampacek
  • L. S. Leshin
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 219)

Abstract

Lactation in the sow is characterized by an anestrous period that usually lasts up to 6 wk (Cole et al., 1975). Serum concentrations of luteinizing hormone (LH) are suppressed during lactation (Stevenson et al., 1981; Stevenson and Britt, 1980) while prolactin (PRL) concentrations are elevated (Bevers et al., 1978; Stevenson et al., 1981; Dusza and Krzymowska, 1981). Serum follicle stimulating hormone (FSH) concentrations increase gradually beyond the third week of lactation which appears to be related to a reduction in suckling frequency of the litter (Stevenson et al., 1981). Weaning generally results in an increase in serum LH and FSH (Cox and Britt, 1982; Shaw and Foxcroft, 1985) concentrations and a decrease in serum PRL concentrations (Bevers et al., 1978; van Landeghem and van de Wiel, 1978).

Keywords

Estrogen Dopamine Lactate Prostaglandin Norepinephrine 

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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • C. R. Barb
    • 1
    • 2
  • R. R. Kraeling
    • 1
    • 2
  • G. B. Rampacek
    • 1
    • 2
  • L. S. Leshin
    • 1
    • 2
  1. 1.Animal Physiology Research Unit, R B Russell Research CenterUSDA-ARSAthensUSA
  2. 2.University of GeorgiaAthensUSA

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