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Placentation in cloned cattle: structure and microvascular architecture.

M A Miglino1, F T V Pereira, J A Visintin

  • 1Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP, Brazil. miglino@usp.br

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Summary

Cloned cattle pregnancies show significant placental abnormalities, including edema and altered placentome structure. These morphological changes in fetal membranes are linked to poor pregnancy outcomes in cloned cattle.

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Area of Science:

  • Veterinary Pathology
  • Reproductive Biology
  • Animal Cloning

Background:

  • Somatic nucleus transfer (NT) in cattle can result in pregnancy complications.
  • Understanding placental development is crucial for successful assisted reproductive technologies.

Purpose of the Study:

  • To investigate and compare placental morphology between normal and cloned cattle pregnancies.
  • To identify specific pathological changes in placentas from cloned cattle.

Main Methods:

  • Macroscopic examination of umbilical cord, placentomes, and fetal membranes.
  • Light and scanning electron microscopy of placental tissues.
  • Analysis of blood vessel casts using scanning electron microscopy.

Main Results:

  • Cloned cattle placentas exhibited edema of umbilical cord and fetal membranes.
  • Common placentomal fusion led to fewer, larger placentomes, with some areas lacking placentomes.
  • Abnormal vascularization within placentomes and dilated crypts were observed in cloned placentas.
  • Extensive maternal blood extravasation occurred in placentomes and interplacentomal regions.

Conclusions:

  • Placentas from cloned cattle pregnancies display significant pathomorphological alterations.
  • These observed placental abnormalities are likely associated with the reduced clinical success rates of cattle cloning.
  • Further research is needed to address these placental issues in cloned pregnancies.