<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

Publié en ligne: 31 déc. 2018

Pages: 571 - 579

Reçu: 09 juin 2018

Accepté: 12 déc. 2018

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

Mots clés
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

Publié en ligne: 31 déc. 2018

Pages: 571 - 579

Reçu: 09 juin 2018

Accepté: 12 déc. 2018

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

Mots clésewes, 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.

Mots clés
ewes, vaginal electrical resistance, oestrus detector, ovarian follicle, progesterone, oestradiol