SciELO - Scientific Electronic Library Online

 
vol.19CLINICAL AND LABORATORIAL ALTERATIONS AS INDICATORS FOR ANTI-HELMINTIC TREATMENT IN SHEEP EXPERIMENTALLY INFECTED WITH Haemonchus contortusILLEGAL ANIMAL-ORIGIN PRODUCTS SEIZED IN BAGGAGE FROM INTERNATIONAL FLIGHTS AT SAO PAULO GUARULHOS AIRPORT (GRU / SBGR), BRAZIL author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Ciência Animal Brasileira

Print version ISSN 1518-2797On-line version ISSN 1809-6891

Abstract

SILVA, Talita Fernandes da; COSTA, Sanely Lourenço da; COSTA, Eduardo Paulino da  and  GUIMARAES, José Domingos. EFFECT OF SOMATOTROPIN AND THYROXINE ON THE IN VITRO DEVELOPMENT OF BOVINE PREANTRAL FOLLICLES. Ciênc. anim. bras. [online]. 2018, vol.19, e-45994.  Epub May 17, 2018. ISSN 1518-2797.  https://doi.org/10.1590/1809-6891v19e-45994.

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.

Keywords : bovine; hormones; in vitro culture; ovarian follicles.

        · abstract in Portuguese     · text in English     · English ( pdf )