<abstract xmlns="http://www.w3.org/1999/xhtml"><bold>Introduction:</bold> The ovarian follicular dynamics, vaginal electrical resistance (VER), progesterone (P4) and oestrogen (E2) profiles were investigated during the oestrous cycle in four indigenous ewes.<bold>Material and Methods:</bold> Daily VER values were recorded with a heat detector. The follicles were observed and measured by trans-rectal ultrasonography. Blood was collected daily for hormonal profiles.<bold>Results:</bold> A significant variation in VER values (P &lt; 0.05) in oestrus by ewes and position in the sequence of cycles was observed. Trans-rectal ultrasonography of ovaries revealed the presence of 2–4 waves of follicular growth. Study of hormonal profiles by ELISA revealed a positive correlation between E2 concentration and development of follicles and a negative correlation between P4 concentration and their development. The concentrations of oestradiol increased in oestrus and then decreased to a basal level. Follicular growth was accompanied by a rise in the concentration of serum oestradiol. Inversely, when follicles received the stimulation for ovulation, concentration of progesterone started to fall, but after ovulation, it climbed back to its peak and remained at this state until next ovulatory follicle reached its maximum diameter.<bold>Conclusion:</bold> This study could help to set up a manipulative reproductive technique for improving genetic values in indigenous sheep.</abstract>

Introduction: The ovarian follicular dynamics, vaginal electrical resistance (VER), progesterone (P4) and oestrogen (E2) profiles were investigated during the oestrous cycle in four indigenous ewes.Material and Methods: Daily VER values were recorded with a heat detector. The follicles were observed and measured by trans-rectal ultrasonography. Blood was collected daily for hormonal profiles.Results: A significant variation in VER values (P < 0.05) in oestrus by ewes and position in the sequence of cycles was observed. Trans-rectal ultrasonography of ovaries revealed the presence of 2–4 waves of follicular growth. Study of hormonal profiles by ELISA revealed a positive correlation between E2 concentration and development of follicles and a negative correlation between P4 concentration and their development. The concentrations of oestradiol increased in oestrus and then decreased to a basal level. Follicular growth was accompanied by a rise in the concentration of serum oestradiol. Inversely, when follicles received the stimulation for ovulation, concentration of progesterone started to fall, but after ovulation, it climbed back to its peak and remained at this state until next ovulatory follicle reached its maximum diameter.Conclusion: This study could help to set up a manipulative reproductive technique for improving genetic values in indigenous sheep.

Monitoring vaginal electrical resistance, follicular waves, and hormonal profile during oestrous cycle in the transition period in Bangladeshi sheep

Department of Surgery and Obstetrics, Faculty of Veterinary Science

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Introduction: The ovarian follicular dynamics, vaginal electrical resistance (VER), progesterone (P4) and oestrogen (E2) profiles were investigated during the...

Monitoring vaginal electrical resistance, follicular waves, and hormonal profile during oestrous cycle in the transition period in Bangladeshi sheep

Published Online: Dec 31, 2018

Page range: 571 - 579

Received: Jun 09, 2018

Accepted: Dec 12, 2018

DOI: https://doi.org/10.2478/jvetres-2018-0080

Keywords
ewes, vaginal electrical resistance, oestrus detector, ovarian follicle, progesterone, oestradiol

© 2018 Mohammad Rafiqul Islam Talukder et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Monitoring vaginal electrical resistance, follicular waves, and hormonal profile during oestrous cycle in the transition period in Bangladeshi sheep

Published Online: Dec 31, 2018

Page range: 571 - 579

Received: Jun 09, 2018

Accepted: Dec 12, 2018

DOI: https://doi.org/10.2478/jvetres-2018-0080

Keywordsewes, vaginal electrical resistance, oestrus detector, ovarian follicle, progesterone, oestradiol

© 2018 Mohammad Rafiqul Islam Talukder et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
ewes, vaginal electrical resistance, oestrus detector, ovarian follicle, progesterone, oestradiol