Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Effects of Ovarian Status at the Time of Initiation of the Modified Double-Ovsynch Program on the Reproductive Performance in Dairy Cows

  • Jaekwan Jeong (College of Veterinary Medicine, Chungbuk National University) ;
  • Illhwa Kim (College of Veterinary Medicine, Chungbuk National University)
  • Received : 2023.03.23
  • Accepted : 2023.05.22
  • Published : 2023.06.30
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Abstract

This study determined the effect of ovarian status at the beginning of the modified Double-Ovsynch program on reproductive performance in dairy cows. In the study, 1,302 cows were treated with a modified Double-Ovsynch program at 56 days after calving. This program comprises administering gonadotropin-releasing hormones (GnRH), prostaglandin F2α (PGF2α) 10 days later, GnRH 3 days later, GnRH 7 days later, and GnRH 56 h later, followed by timed artificial insemination (TAI) 16 h later. At the beginning of the program, cows were categorized according to the size of the largest follicle and the presence of a corpus luteum (CL) in the ovaries as follows: 1) small follicle (<5 mm, SF group, n = 100), 2) medium follicle (8-20 mm, MF group, n = 538), and 3) large follicle (≥25 mm, LF group, n = 354) without a CL, or 4) the presence of a CL (CL group, n = 310). The pregnancies per AI after the first TAI were analyzed by logistic regression using the LOGISTIC procedure, and the logistic model included the fixed effects of the herd size, parity, body condition score (BCS) at the first TAI, TAI period, and ovarian status. A larger herd size, higher BCS at the first TAI, and TAI period with no heat stress increased (p < 0.05) the probability of pregnancy per AI after the first TAI. However, ovarian status at the beginning of the program did not affect (p > 0.05) the pregnancies per AI (ranges of 37.9% to 42.9%). These results show that the modified Double-Ovsynch program can be used effectively while maintaining good fertility regardless of the ovarian status in dairy herds.

Keywords

References

  1. Banos G, Coffey MP. Genetic association between body energy measured throughout lactation and fertility in dairy cattle. Animal 2010; 4: 189-199.
  2. Bisinotto RS, Ribeiro ES, Santos JE. Synchronisation of ovulation for management of reproduction in dairy cows. Animal 2014; 8 Suppl 1: 151-159. https://doi.org/10.1017/S1751731114000858
  3. Carvalho PD, Guenther JN, Fuenzalida MJ, Amundson MC, Wiltbank MC, Fricke PM. Presynchronization using a modified Ovsynch protocol or a single gonadotropin-releasing hormone injection 7 d before an Ovsynch-56 protocol for submission of lactating dairy cows to first timed artificial insemination. J Dairy Sci 2014; 97: 6305-6315. https://doi.org/10.3168/jds.2014-8222
  4. Carvalho PD, Souza AH, Amundson MC, Hackbart KS, Fuenzalida MJ, Herlihy MM, et al. Relationships between fertility and postpartum changes in body condition and body weight in lactating dairy cows. J Dairy Sci 2014; 97: 3666-3683. https://doi.org/10.3168/jds.2013-7809
  5. Dochi O, Kabeya S, Koyama H. Factors affecting reproductive performance in high milk-producing Holstein cows. J Reprod Dev 2010; 56 Suppl: S61-S65. https://doi.org/10.1262/jrd.1056S61
  6. Edmonson AJ, Lean IJ, Weaver LD, Farver T, Webster G. A body condition scoring chart for Holstein dairy cows. J Dairy Sci 1989; 72: 68-78. https://doi.org/10.3168/jds.S0022-0302(89)79081-0
  7. Fricke PM, Wiltbank MC. Symposium review: the implications of spontaneous versus synchronized ovulations on the reproductive performance of lactating dairy cows. J Dairy Sci 2022; 105: 4679-4689. https://doi.org/10.3168/jds.2021-21431
  8. Galvao KN, Santos JE. Factors affecting synchronization and conception rate after the Ovsynch protocol in lactating Holstein cows. Reprod Domest Anim 2010; 45: 439-446. https://doi.org/10.1111/j.1439-0531.2008.01220.x
  9. Martins JPN, Acevedo MJT, Cunha TO, Piterini C, Pursley JR. The effect of presynchronization with prostaglandin F2α and gonadotropin-releasing hormone simultaneously, 7 d before Ovsynch, compared with Presynch-10/Ovsynch on luteal function and first-service pregnancies per artificial insemination. J Dairy Sci 2017; 100: 5107-5116. https://doi.org/10.3168/jds.2016-11628
  10. Pursley JR, Mee MO, Wiltbank MC. Synchronization of ovulation in dairy cows using PGF2α and GnRH. Theriogenology 1995; 44: 915-923. https://doi.org/10.1016/0093-691X(95)00279-H
  11. Rodgers RJ, Irving-Rodgers HF. Morphological classification of bovine ovarian follicles. Reproduction 2010; 139: 309-318. https://doi.org/10.1530/REP-09-0177
  12. Roth Z, Wolfenson D. Comparing the effects of heat stress and mastitis on ovarian function in lactating cows: basic and applied aspects. Domest Anim Endocrinol 2016; 56 Suppl: S218-S227. https://doi.org/10.1016/j.domaniend.2016.02.013
  13. Santos VG, Carvalho PD, Maia C, Carneiro B, Valenza A, Fricke PM. Fertility of lactating Holstein cows submitted to a Double-Ovsynch protocol and timed artificial insemination versus artificial insemination after synchronization of estrus at a similar day in milk range. J Dairy Sci 2017; 100: 8507-8517. https://doi.org/10.3168/jds.2017-13210
  14. Souza AH, Ayres H, Ferreira RM, Wiltbank MC. A new presynchronization system (Double-Ovsynch) increases fertility at first postpartum timed AI in lactating dairy cows. Theriogenology 2008; 70: 208-215. https://doi.org/10.1016/j.theriogenology.2008.03.014
  15. Turk R, Podpecan O, Mrkun J, Flegar-Mestric Z, Perkov S, Zrimsek P. The effect of seasonal thermal stress on lipid mobilisation, antioxidant status and reproductive performance in dairy cows. Reprod Domest Anim 2015; 50: 595-603. https://doi.org/10.1111/rda.12534