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Embryonic and fetal development in different genotypes in pigs

S P Ford1

  • 1Department of Animal Science, Iowa State University, Ames 50011-3150, USA.

Journal of Reproduction and Fertility. Supplement
|January 1, 1997
PubMed
Summary

Chinese Meishan pigs achieve larger litter sizes through a unique reproductive strategy. Their conceptuses grow slower initially, reducing early loss, and later enhance placental efficiency via increased blood vessel density, not size.

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Area of Science:

  • Reproductive Biology
  • Comparative Mammalian Physiology
  • Swine Genetics

Background:

  • Uterine capacity, not ovulation rate, limits litter size in domestic pigs.
  • Chinese Meishan pigs exhibit higher prolificacy than US/European breeds, despite similar ovulation rates and uterine size.
  • Meishan conceptuses display distinct developmental strategies compared to less prolific breeds.

Purpose of the Study:

  • To investigate the reproductive strategies of Chinese Meishan pigs contributing to their larger litter sizes.
  • To compare the conceptus and placental development between Meishan and less prolific pig breeds.
  • To elucidate the mechanisms underlying enhanced fetal survival and placental efficiency in Meishan pigs.

Main Methods:

  • Comparative analysis of conceptus development and growth rates.
  • Histological examination of placental vasculature.
  • Assessment of fetal and placental size throughout gestation.

Main Results:

  • Meishan conceptuses exhibit reduced preimplantation mitotic rates and smaller size, leading to lower early gestation loss.
  • Meishan fetuses achieve placental efficiency through increased placental blood vessel density, not increased placental size.
  • This vascular proliferation compensates for the smaller fetal size, enabling survival past day 30 of gestation.

Conclusions:

  • Meishan pigs utilize a dual strategy: reduced early conceptus growth and enhanced placental vascularization for high prolificacy.
  • Increased placental vascular density in Meishan pigs is a key adaptation for supporting a larger number of fetuses within uterine capacity limits.
  • Understanding these mechanisms offers insights into reproductive efficiency in swine and potential applications in breeding programs.

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