<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Oestrus resynchronisation (RES, Resynch) programmes for non-pregnant cows allow shortening the period between an unsuccessful insemination and the next attempt on the same cow. The protocol of oestrus RES may be started after ruling out pregnancy by means of ultrasonography carried out 28 days after insemination or after performing a test for pregnancy-specific glycoproteins (PAG) in blood or milk. The Resynch protocol can be based on a double application of prostaglandins, the OvSynch protocol, or hormonal therapy with exogenous sources of progesterone (CIDR intravaginal devices). The efficiency of the method depends on the functional state of the ovaries, the diameter of the corpus luteum, external factors, and the health and maturity of the cows. The present paper constitutes a comparison of research findings concerning the effectiveness of RES programmes.</p></abstract>

Oestrus resynchronisation (RES, Resynch) programmes for non-pregnant cows allow shortening the period between an unsuccessful insemination and the next attempt on the same cow. The protocol of oestrus RES may be started after ruling out pregnancy by means of ultrasonography carried out 28 days after insemination or after performing a test for pregnancy-specific glycoproteins (PAG) in blood or milk. The Resynch protocol can be based on a double application of prostaglandins, the OvSynch protocol, or hormonal therapy with exogenous sources of progesterone (CIDR intravaginal devices). The efficiency of the method depends on the functional state of the ovaries, the diameter of the corpus luteum, external factors, and the health and maturity of the cows. The present paper constitutes a comparison of research findings concerning the effectiveness of RES programmes.

Resynchronisation as an element of improving cattle reproduction efficiency

Veterinary Centre of Nicolaus Copernicus University

Department of Reproduction and Clinic of Farm Animals, Faculty of Veterinary Medicine

Wrocław University of Environmental and Life Sciences

Journal of Veterinary Research

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

{"article-title":"Resynchronisation as an element of improving cattle reproduction efficiency"}

Oestrus resynchronisation (RES, Resynch) programmes for non-pregnant cows allow shortening the period between an unsuccessful insemination and the next attempt...

Resynchronisation as an element of improving cattle reproduction efficiency

Published Online: Mar 28, 2019

Page range: 107 - 115

Received: Jul 16, 2018

Accepted: Feb 12, 2019

DOI: https://doi.org/10.2478/jvetres-2019-0009

Keywords
cattle, resynchronisation, reproduction, pregnancy

© 2019 Jędrzej M. Jaśkowski et al., published by Sciendo

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

Resynchronisation as an element of improving cattle reproduction efficiency

Published Online: Mar 28, 2019

Page range: 107 - 115

Received: Jul 16, 2018

Accepted: Feb 12, 2019

DOI: https://doi.org/10.2478/jvetres-2019-0009

Keywordscattle, resynchronisation, reproduction, pregnancy

© 2019 Jędrzej M. Jaśkowski et al., published by Sciendo

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

Keywords
cattle, resynchronisation, reproduction, pregnancy