Hormone Research Reveals Impact of Progesterone and Estrous Expression on Endometrial Gene Expression in Holstein Cows

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Researchers from the University of British Columbia conducted a study to evaluate the effects of different progesterone concentrations and estrous expression on endometrial gene expression in lactating Holstein cows. The study involved 33 cows, with 16 in the control group and 17 in the low progesterone group. The cows underwent a presynchronization protocol involving a GnRH injection and progesterone implant, followed by a PGF injection and implant removal after 7 days. The progesterone treatment began 3 days after the second GnRH injection, with the low progesterone group receiving three PGF injections 12 hours apart, and the control group receiving no PGF injections.

Key Takeaways:

  • The study revealed substantial differences in endometrial gene expression between cows treated with different progesterone concentrations during the follicular growth and expressing different intensities of estrus.
  • The research found that endometrial gene expression was significantly affected by the interaction between progesterone treatment and estrous expression, with cows in the low progesterone group showing different gene expression profiles compared to those in the control group.
  • The study used the NanoString nCounter system to determine the abundance of specific mRNA molecules for 91 genes, and analyzed the data using a mixed linear regression model with cow as a random intercept.
  • The research found that the cow's physical activity was monitored by an activity monitor, and the duration and intensity of estrus were measured, with a total of 33 cows submitted to uterine biopsy 7 and 14 days after the identified estrous event.
  • The study highlighted the importance of considering the interaction between progesterone treatment and estrous expression when studying endometrial gene expression in lactating Holstein cows.
  • The research demonstrated that the P4 treatment clearly affected endometrial gene expression in cows, leading to different expression levels of specific genes.
  • The study's findings have significant implications for understanding the mechanisms underlying endometrial gene expression in lactating Holstein cows and may contribute to the development of new reproductive management strategies.
  • The researchers involved in the study include J.P.O. Maciel, J.C.S. Marques, J. Denis-Robichaud, A.M.L. Madureira, R.S. Conceicao, S. Moore, A. Conley, F. Lima, C.C. Bartolomeu, W.A. Gomes, and R.L.A. Cerri.

Statistics:

  • 33 cows were used in the study, with 16 in the control group and 17 in the low progesterone group.
  • The cows underwent a presynchronization protocol involving a GnRH injection and progesterone implant, followed by a PGF injection and implant removal after 7 days.
  • The progesterone treatment began 3 days after the second GnRH injection, with the low progesterone group receiving three PGF injections 12 hours apart, and the control group receiving no PGF injections.
  • The cows were submitted to uterine biopsy 7 and 14 days after the identified estrous event, and total RNA was extracted from each sample.
  • The NanoString nCounter system was used to determine the abundance of specific mRNA molecules for 91 genes.
  • The data was analyzed using a mixed linear regression model with cow as a random intercept.

Sources:

  • NewsRx. University of British Columbia Reports Findings in Corpus Luteum Hormones (Endometrial gene expression of lactating Holstein cows: Impact of pre-estrus progesterone and intensity of estrous expression). Life Science Weekly. August 19, 2025; p 8396.
  • Endometrial gene expression of lactating Holstein cows: Impact of pre-estrus progesterone and intensity of estrous expression. Journal of Dairy Science, 2025.
  • Journal of Dairy Science. Elsevier Science Inc, Ste 800, 230 Park Ave, New York, NY 10169, USA. (Elsevier - www.elsevier.com; Journal of Dairy Science - www.journals.elsevier.com/journal-of-dairy-science/).