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KMID : 0359320230630020007
Korean Journal of Veterinary Research
2023 Volume.63 No. 2 p.7 ~ p.7
Effect of resynchronization programs according to the ovarian status on pregnancy outcomes in dairy cows
Jeong Jae-Kwan

Kim Ui-Hyung
Kim Ill-Hwa
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
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