Korean J Vet Res.  2023 Jun;63(2):e14. 10.14405/kjvr.20230011.

Effect of resynchronization programs according to the ovarian status on pregnancy outcomes in dairy cows

• Jeong J
• Kim U
• Kim I

• KMID: 2543761
• DOI: http://doi.org/10.14405/kjvr.20230011

Abstract

This study evaluated the effect of resynchronization programs on pregnancies in dairy cows. Of 1,342 cows confirmed not pregnant after their first artificial insemination (AI), those with a corpus luteum (CL) were resynchronized using Ovsynch or PG-GnRH-Ovsynch and those without a CL were resynchronized using GnRH-Ovsynch or modified Double-Ovsynch. There were no differences (p > 0.05) in the pregnancies per AI either between the Ovsynch (31.3%) and PG-GnRH-Ovsynch (34.0%) or between the GnRH-Ovsynch (38.7%) and modified Double-Ovsynch (39.5%). In conclusion, Ovsynch and GnRH-Ovsynch programs could be preferred to resynchronize cows with and without a CL, respectively, from the perspective of reducing costs and labor.

Keyword

resynchronization; Ovsynch; presynchronization; dairy cow; reproductive performance