Effect of somatotropin and thyroxine on the in vitro development of bovine preantral follicles

  • Talita Fernandes da Silva Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, talita_fernandes@hotmail.com
  • Eduardo Paulino da Costa Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, epcosta@ufv.br
  • Sanely Lourenço da Costa Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, sanelylc@hotmail.com
  • José Domingos Guimarães Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, jdguima@ufv.br

Resumo

The aim of the study was to evaluate the effect of recombinant bovine somatotropin (rbST) and thyroxine (T4) on survival and growth of bovine preantral ovarian follicles (PAOF) cultured in vitro. Ovarian fragments were collected in local abattoirs and immediately fixed for classical histology and transmission electron microscopy (non-cultured control). The other fragments were then cultured in situ for seven days in minimum essential medium alone (MEM+ - cultured control) or in the presence of 1,000 ng/mL rbST and 20 ng/mL T4, isolated or associated. After seven days, there was a reduction (P<0.05) in the percentage of normal follicles in MEM+ alone or with T4. In oocyte diameter, there was a reduction in MEM+ alone. There was no influence (P>0.01) of the medium used on the follicular diameter of the PAOF cultured for seven days. Ultrastructural analysis showed cell damage. In conclusion, the presence of rbST maintains the rate of morphologically normal follicles during the culture for seven days (observed by optical microscopy), but it does not exert beneficial effects on its ultrastructural integrity and oocyte and follicular growth. 

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Biografia do Autor

Talita Fernandes da Silva, Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, talita_fernandes@hotmail.com
Eduardo Paulino da Costa, Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, epcosta@ufv.br
Sanely Lourenço da Costa, Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, sanelylc@hotmail.com
José Domingos Guimarães, Universidade Federal de Viçosa. Viçosa, Minas Gerais, Brasil, jdguima@ufv.br
Publicado
10-04-2018
Como Citar
Fernandes da Silva, T., Paulino da Costa, E., Lourenço da Costa, S., & Domingos Guimarães, J. (2018). Effect of somatotropin and thyroxine on the in vitro development of bovine preantral follicles. Ciência Animal Brasileira, 19, 1-9. Recuperado de https://www.revistas.ufg.br/vet/article/view/e-45994
Seção
MEDICINA VETERINÁRIA