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Ovarian follicle growth dynamics during the postpartum period in Holstein cows and effects of contemporary cyst occurrence

Author

Listed:
  • R. Rajmon

    (Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • J. Šichtař

    (Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • L. Vostrý

    (Department of Genetics and Breeding, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • D. Řehák

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

Abstract

The indicators of follicle development with regard to the growth wave order, the first ovulation, animal parity, and also with regard to the simultaneous presence or absence of a follicular cyst were determined in cows in the course of 60 days postpartum. Follicular dynamics were monitored daily by ultrasonography. The animals were assigned to three groups based on the time of the 1st ovulation: G1 (n = 9) - the 1st dominant follicle (DF) ovulated, G2 (n = 10) - ovulation occurred on the 2nd or later follicular waves, and G3 (n = 5) - no ovulation occurred during the experimental period. G1 animals showed better fertility later (no cyst, less days open, P = 0.07, less hormonal treatment, P = 0.008). The rhythm of follicular wave development was generally similar in all the animals (based on emergence of the first follicular wave, the interval from emergence to deviation, and the number of all follicular waves). Nevertheless, emergence of follicular waves and deviation occurred by 0.5-0.9 day earlier in primiparous than in multiparous cows and in G1 vs. G2, or G3, respectively (in all P < 0.05). DF development was independent of parity as well as group effects, but the maximum size and growth rate (1.2 vs. 0.8 cm/day, P < 0.05) were higher in ovulatory follicles (OF) than in regressive ones (rDF). The presence of a growing cyst decreased the probability of rDF as well as OF development (P < 0.0001). The OF growth rate was faster in the milieu of a stagnating cyst than without any cyst (P < 0.04). Therefore, the development of follicles was dramatically suppressed beyond, but nor before, deviation in the milieu of a growing cyst. Cessation of the cyst growth accelerated the development of OFs. On the contrary, a cystic structure without any significant growth can persist for weeks with no effect on successful follicular development.

Suggested Citation

  • R. Rajmon & J. Šichtař & L. Vostrý & D. Řehák, 2012. "Ovarian follicle growth dynamics during the postpartum period in Holstein cows and effects of contemporary cyst occurrence," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 57(12), pages 562-572.
    • Handle: RePEc:caa:jnlcjs:v:57:y:2012:i:12:id:6414-cjas
    DOI: 10.17221/6414-CJAS
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    References listed on IDEAS

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    1. D. Rasch & O. Mašata, 2006. "Methods of variance component estimation," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 51(6), pages 227-235.
    2. J. Šichtař & R. Tolman & R. Rajmon & P. Klabanová & P. Berka & J. Volek, 2010. "A comparison of the follicular dynamics in heifers of the Czech Fleckvieh and Holstein breeds," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 55(6), pages 234-242.
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    1. J. Šichtař & R. Rajmon & K. Hošková & D. Řehák & L. Vostrý & H. Härtlová, 2013. "The luteal blood flow, area and pixel intensity of corpus luteum, levels of progesterone in pregnant and nonpregnant mares in the period of 16 days after ovulation," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 58(11), pages 512-519.

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