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Prolactin in the developing pig.

J C Meijer1, V L Trudeau, B Colenbrander

  • 1Department of Veterinary Anatomy, University of Utrecht, The Netherlands.

Biology of Reproduction
|September 1, 1988
PubMed
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This study tracked prolactin (PRL) levels and lactotrope development in fetal and postnatal pigs. Results indicate PRL plays a role in the gonadal development of pigs.

Area of Science:

  • Reproductive Endocrinology
  • Developmental Biology
  • Comparative Physiology

Background:

  • Prolactin (PRL) is a key hormone in mammalian reproduction and development.
  • Understanding PRL dynamics is crucial for reproductive health in livestock.
  • Fetal and postnatal pig models offer insights into endocrine regulation.

Purpose of the Study:

  • To characterize the developmental profile of prolactin (PRL) in fetal and postnatal pigs.
  • To investigate the development and distribution of lactotropes in the pig pituitary gland.
  • To explore the relationship between PRL levels and gonadal development in pigs.

Main Methods:

  • Plasma PRL levels were measured using radioimmunoassay from fetal stages (31 days post coitum) through adulthood.

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  • Pituitary lactotropes were identified and quantified using immunohistochemistry.
  • PRL profiles were analyzed in relation to sex, castration, and cryptorchidism.

    • Main Results:

    • PRL levels increased significantly in late gestation and showed sex differences from 71-75 days post coitum.
    • Lactotrope development was biphasic, with distinct changes in pituitary PRL content.
    • Postnatal PRL showed high levels initially, followed by prepubertal and pubertal peaks, with castration affecting levels.

    Conclusions:

    • PRL secretion and lactotrope development in pigs exhibit complex temporal patterns.
    • PRL appears to influence gonadal development in pigs, particularly in males.
    • These findings contribute to understanding reproductive endocrinology in swine.