Korean Journal of Veterinary Research (대한수의학회지)

The Korean Society of Veterinary Science (대한수의학회)
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Effect of resynchronization programs according to the ovarian status on pregnancy outcomes in dairy cows

  • Jaekwan Jeong (College of Veterinary Medicine, Chungbuk National University) ;
  • Uihyung Kim (Hanwoo Research Institute, National Institute of Animal Science, Rural Development Administration) ;
  • Illhwa Kim (College of Veterinary Medicine, Chungbuk National University)
  • Received : 2023.03.14
  • Accepted : 2023.04.11
  • Published : 2023.06.30
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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.

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References

  1. Reith S, Hoy S. Review: behavioral signs of estrus and the potential of fully automated systems for detection of estrus in dairy cattle. Animal 2018;12:398-407. https://doi.org/10.1017/S1751731117001975
  2. Sterry RA, Welle ML, Fricke PM. Effect of interval from timed artificial insemination to initiation of resynchronization of ovulation on fertility of lactating dairy cows. J Dairy Sci 2006;89:2099-2109. https://doi.org/10.3168/jds.S0022-0302(06)72280-9
  3. Wijma R, Perez MM, Masello M, Stangaferro ML, Giordano JO. A resynchronization of ovulation program based on ovarian structures present at nonpregnancy diagnosis reduced time to pregnancy in lactating dairy cows. J Dairy Sci 2018;101:1697-1707. https://doi.org/10.3168/jds.2017-13489
  4. Dewey ST, Mendonca LG, Lopes G Jr, Rivera FA, Guagnini F, Chebel RC, Bilby TR. Resynchronization strategies to improve fertility in lactating dairy cows utilizing a presynchronization injection of GnRH or supplemental progesterone: I. Pregnancy rates and ovarian responses. J Dairy Sci 2010;93:4086-4095. https://doi.org/10.3168/jds.2010-3233
  5. Sinedino LD, Lima FS, Bisinotto RS, Cerri RL, Santos JE. Effect of early or late resynchronization based on different methods of pregnancy diagnosis on reproductive performance of dairy cows. J Dairy Sci 2014;97:4932-4941. https://doi.org/10.3168/jds.2013-7887
  6. Herlihy MM, Crowe MA, Berry DP, Diskin MG, Butler ST. Factors associated with fertility outcomes in cows treated with protocols to synchronize estrus and ovulation in seasonal-calving, pasture-based dairy production systems. J Dairy Sci 2013;96:1485-1498. https://doi.org/10.3168/jds.2011-5250
  7. Vasconcelos JL, Silcox RW, Rosa GJ, Pursley JR, Wiltbank MC. Synchronization rate, size of the ovulatory follicle, and pregnancy rate after synchronization of ovulation beginning on different days of the estrous cycle in lactating dairy cows. Theriogenology 1999;52:1067-1078. https://doi.org/10.1016/S0093-691X(99)00195-8
  8. Carvalho PD, Fuenzalida MJ, Ricci A, Souza AH, Barletta RV, Wiltbank MC, Fricke PM. Modifications to Ovsynch improve fertility during resynchronization: Evaluation of presynchronization with gonadotropin-releasing hormone 6 d before initiation of Ovsynch and addition of a second prostaglandin F2α treatment. J Dairy Sci 2015;98:8741-8752. https://doi.org/10.3168/jds.2015-9719
  9. Giordano JO, Wiltbank MC, Guenther JN, Pawlisch R, Bas S, Cunha AP, Fricke PM. Increased fertility in lactating dairy cows resynchronized with Double-Ovsynch compared with Ovsynch initiated 32 d after timed artificial insemination. J Dairy Sci 2012;95:639-653. https://doi.org/10.3168/jds.2011-4418
  10. Spencer JA, Carnahan K, Shafii B, Price WJ, Dalton J, Ahmadzadeh A. Pregnancy outcomes are not improved by administering gonadotropin-releasing hormone at initiation of a 5-day CIDR-Cosynch resynchronization protocol for lactating dairy cows. J Dairy Sci 2018;101:8524-8531. https://doi.org/10.3168/jds.2017-13491
  11. Bruno RG, Moraes JG, Hernandez-Rivera JA, Lager KJ, Silva PR, Scanavez AL, Mendonca LG, Chebel RC, Bilby TR. Effect of an Ovsynch56 protocol initiated at different intervals after insemination with or without a presynchronizing injection of gonadotropin-releasing hormone on fertility in lactating dairy cows. J Dairy Sci 2014;97:185-194. https://doi.org/10.3168/jds.2013-6827
  12. Alkar A, Tibary A, Wenz JR, Nebel RL, Kasimanickam R. Presynchronization with GnRH 7 days prior to resynchronization with CO-Synch did not improve pregnancy rate in lactating dairy cows. Theriogenology 2011;76:1036-1041. https://doi.org/10.1016/j.theriogenology.2011.05.006
  13. Bello NM, Steibel JP, Pursley JR. Optimizing ovulation to first GnRH improved outcomes to each hormonal injection of ovsynch in lactating dairy cows. J Dairy Sci 2006;89:3413-3424. https://doi.org/10.3168/jds.S0022-0302(06)72378-5