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Home / Equine Research Bank / PLoS One / Enhanced or reduced fetal growth induced by embryo transfer ...
PloS one2014; 9(7); e102044; doi: 10.1371/journal.pone.0102044

Enhanced or reduced fetal growth induced by embryo transfer into smaller or larger breeds alters post-natal growth and metabolism in pre-weaning horses.

Abstract: In equids, placentation is diffuse and nutrient supply to the fetus is determined by uterine size. This correlates with maternal size and affects intra-uterine development and subsequent post-natal growth, as well as insulin sensitivity in the newborn. Long-term effects remain to be described. In this study, fetal growth was enhanced or restricted through ET using pony (P), saddlebred (S) and draft (D) horses. Control P-P (n = 21) and S-S (n = 28) pregnancies were obtained by AI. Enhanced and restricted pregnancies were obtained by transferring P or S embryos into D mares (P-D, n = 6 and S-D, n = 8) or S embryos into P mares (S-P, n = 6), respectively. Control and experimental foals were raised by their dams and recipient mothers, respectively. Weight gain, growth hormones and glucose homeostasis were investigated in the foals from birth to weaning. Fetal growth was enhanced in P-D and these foals remained consistently heavier, with reduced T3 concentrations until weaning compared to P-P. P-D had lower fasting glucose from days 30 to 200 and higher insulin secretion than P-P after IVGTT on day 3. Euglycemic clamps in the immediate post-weaning period revealed no difference in insulin sensitivity between P-D and P-P. Fetal growth was restricted in S-P and these foals remained consistently lighter until weaning compared to S-D, with elevated T3 concentrations in the newborn compared to S-S. S-P exhibited higher fasting glycemia than S-S and S-D from days 30 to 200. They had higher maximum increment in plasma glucose than S-D after IVGTT on day 3 and clamps on day 200 demonstrated higher insulin sensitivity compared to S-D. Neither the restricted nor the enhanced fetal environment affected IGF-1 concentrations. Thus, enhanced and restricted fetal and post-natal environments had combined effects that persisted until weaning. They induced different adaptive responses in post-natal glucose metabolism: an early insulin-resistance was induced in enhanced P-D, while S-P developed increased insulin sensitivity.
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Publication Date: 2014-07-09 PubMed ID: 25006665PubMed Central: PMC4090198DOI: 10.1371/journal.pone.0102044Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research investigates how the alteration of fetal growth, by transferring an embryo onto a larger or smaller breed, affects the post-birth growth and metabolism of pre-weaning horses. The study concludes that both enhanced and restricted fetal environments have effects that last until weaning, inducing different responses in post-birth glucose metabolism.

Methodology

  • The study was conducted on three different types of horses: pony (P), saddlebred (S) and draft (D).
  • Control pregnancies were obtained through artificial insemination in ponies (P-P) and saddlebred horses (S-S). Enhanced and restricted pregnancies were created by transferring pony or saddlebred embryos into a draft mare (P-D and S-D), or by transferring a saddlebred embryo into a pony mare (S-P).
  • The foals were monitored from birth to weaning, assessing their weight gain, growth hormone levels, and glucose metabolism.

Observations

  • Pony embryos transferred to draft mares (P-D) resulted in enhanced fetal growth and the foals remained heavier than control ponies (P-P) up to weaning.
  • These P-D foals showed reduced T3 hormone concentrations and lower fasting glucose levels compared to P-P. They also showed higher insulin secretion after an intravenous glucose tolerance test performed on day 3.
  • Saddlebred embryos transferred into a pony mare (S-P) resulted in restricted fetal growth, and these foals remained lighter until weaning compared to those where saddlebred embryos were transferred to draft mares (S-D).
  • The S-P foals also exhibited higher fasting glycemia, a higher maximum increase in plasma glucose after the 3rd day IVGTT, and higher insulin sensitivity compared to S-D.
  • The Insulin-like growth factor 1 (IGF-1) concentrations remained unaffected in both enhanced and restricted fetal environments.

Conclusion

  • The findings suggest that the manipulation of fetal growth through embryo transfer in horses can significantly impact their postnatal growth and glucose metabolism.
  • Enhanced growth (as in the P-D foals) seemed to induce a form of early insulin resistance, while restricted growth (S-P foals) led to increased insulin sensitivity.
  • The findings could have significant implications for understanding how intrauterine environments could influence the health and metabolic adaptations in newborn animals.

Cite This Article

APA
Peugnet P, Wimel L, Duchamp G, Sandersen C, Camous S, Guillaume D, Dahirel M, Dubois C, Jouneau L, Reigner F, Berthelot V, Chaffaux S, Tarrade A, Serteyn D, Chavatte-Palmer P. (2014). Enhanced or reduced fetal growth induced by embryo transfer into smaller or larger breeds alters post-natal growth and metabolism in pre-weaning horses. PLoS One, 9(7), e102044. https://doi.org/10.1371/journal.pone.0102044

Publication

PloS one
ISSN: 1932-6203
NlmUniqueID: 101285081
Country: United States
Language: English
Volume: 9
Issue: 7
Pages: e102044

Researcher Affiliations

Peugnet, Pauline
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.
Wimel, Laurence
  • IFCE, Station Expérimentale de la Valade, Chamberet, France.
Duchamp, Guy
  • INRA, UE1293, Nouzilly, France.
Sandersen, Charlotte
  • Clinique équine, Faculté de Médecine Vétérinaire, CORD, Université de Liège, Liège, Belgique.
Camous, Sylvaine
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.
Guillaume, Daniel
  • INRA, UMR85, Physiologie de la Reproduction et Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais de Tours, Tours, France; IFCE, Nouzilly, France.
Dahirel, Michèle
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.
Dubois, Cédric
  • IFCE, Station Expérimentale de la Valade, Chamberet, France.
Jouneau, Luc
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.
Reigner, Fabrice
  • INRA, UE1293, Nouzilly, France.
Berthelot, Valérie
  • INRA, UMR791 Modélisation Systémique Appliquée aux Ruminants, Paris, France; AgroParis Tech, Paris, France.
Chaffaux, Stéphane
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.
Tarrade, Anne
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.
Serteyn, Didier
  • Clinique équine, Faculté de Médecine Vétérinaire, CORD, Université de Liège, Liège, Belgique.
Chavatte-Palmer, Pascale
  • INRA, UMR1198 Biologie du Développement et Reproduction, Jouy en Josas, France; ENVA, Maisons Alfort, France.

MeSH Terms

  • Animals
  • Animals, Newborn / growth & development
  • Animals, Newborn / metabolism
  • Blood Glucose / metabolism
  • Breeding
  • Embryo Transfer / veterinary
  • Female
  • Fetal Development
  • Growth Hormone / metabolism
  • Horses / growth & development
  • Horses / metabolism
  • Insulin Resistance
  • Male
  • Pregnancy
  • Weaning
  • Weight Gain

Conflict of Interest Statement

Competing Interests: Co-author Pascale Chavatte-Palmer is a PLOS ONE Editorial Board member. This does not alter the authors\' adherence to all the PLOS ONE policies on sharing data and materials.

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