Early embryonic death in mares: clinical and hormonal aspects

Authors

  • Frederico Ozanam Papa Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP
  • Maria Denise Lopes Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP
  • Marco Antonio Alvarenga Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP
  • Cezinande de Meira Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP
  • Maria Cecília Rui Luvizotto Universidade Estadual Paulista, Faculdade de Odontologia, Departamento de Clínica, Cirurgia e Reprodução Animal, Araçatuba, SP
  • Hélio Langoni Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Higiene Veterinária e Saúde Pública, Botucatu, SP
  • Erley Felix Ribeiro Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP
  • Antonio Esteves Azedo Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP
  • Antonio Carlos de Miranda Bomfim Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal e Radiologia Veterinária, Botucatu, SP

DOI:

https://doi.org/10.1590/S1413-95961998000400005

Keywords:

Embryo mortality, Progesterone, Estrogen, Histopathology, Equine

Abstract

The present study aimed to diagnose early embryonic death in 128 mares. Blood samples were collected at the 4th, 7th, 10th, 13th, 16th, 19th, 21st and 30th day after ovulation and the diameter of the corpus luteum was measured. The diameter and characteristics of the embryonic vesicle were evaluated by ultrasonography. Microbiology, cytology and histopathology were carried out in mares with embryonic death. Plasma oestrogen and progesterone concentration were measured by radioimmunoassay. From 128 mares, 17 (13.28%) showed early embryonic death. The embryonic losses took place at 19 days of pregnancy in 47.05% and at 21 days of pregnancy in 29.4% of the mares. The diameter of the corpus luteum in the mares that maintained pregnancy was similar to those with embryonic loss. Otherwise, the diameter of the embryonic vesicles was bigger at the 16th, 19th, 21st and 30th day of pregnancy when compared to the mares with embryonic loss. The mean plasma progesterone concentration was similar in both groups and the median plasma oestrogen concentration was higher in the pregnant mares. The cytological, microbiological and histopathological exams revealed that most of the mares had endometritis. Ultrasonography provided an early diagnosis of pregnancy (from the 12th day post-ovulation) and important information about the development of embryo and embryonic death. Endometritis was considered the main cause of embryonic losses in this study.

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Published

1998-01-01

How to Cite

Papa, F. O., Lopes, M. D., Alvarenga, M. A., Meira, C. de, Luvizotto, M. C. R., Langoni, H., Ribeiro, E. F., Azedo, A. E., & Bomfim, A. C. de M. (1998). Early embryonic death in mares: clinical and hormonal aspects. Brazilian Journal of Veterinary Research and Animal Science, 35(4), 170-173. https://doi.org/10.1590/S1413-95961998000400005

Issue

Section

VETERINARY MEDICINE

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