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Growth hormone and mammary development.

K Sejrsen1, S Purup, M Vestergaard

  • 1Danish Institute of Agricultural Sciences, Foulum, Tjele, Denmark. Kr.Sejrsen@agrsci.dk

Domestic Animal Endocrinology
|October 20, 1999
PubMed
Summary

Growth hormone (GH) aids mammary development in ruminants, particularly during late pregnancy, potentially increasing milk yield. However, its precise mechanisms and interactions with insulin-like growth factor-I (IGF-I) require further research.

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Area of Science:

  • Reproductive Endocrinology
  • Mammalian Physiology
  • Animal Science

Background:

  • Early rodent studies established growth hormone's (GH) essential role in mammary development.
  • Ruminant research has explored GH's impact on mammary growth and milk production.

Purpose of the Study:

  • To investigate the role of GH in regulating normal mammary development in ruminants.
  • To examine the potential of GH administration for enhancing mammary growth and milk yield.

Main Methods:

  • Review of existing experimental data on GH treatment in ruminants at various life stages.
  • Analysis of studies examining GH effects on mammary growth and milk production.

Main Results:

  • GH treatment stimulates mammary growth pre-puberty, but milk yield benefits are not consistently proven.

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  • Late pregnancy GH treatment appears to enhance mammary growth and subsequent lactation milk yield.
  • GH's effect on mammary parenchyma varies during lactation, with potential increases in mid-lactation.

    • Conclusions:

    • GH plays a role in ruminant mammary development, with notable effects during late pregnancy.
    • The mechanism of GH action likely involves insulin-like growth factor-I (IGF-I).
    • Further research is needed on GH-IGF-I axis interactions and local factors for a complete understanding.