Effects of cortisol on pregnancy rate and corpus luteum function in heifers: An in vivo study

Hai Thanh Duong, Katarzyna Karolina Piotrowska-Tomala, Tomas Javier Acosta, Mamadnu Mousa Bah, Emilia Sinderewicz, Magdalena Majewska, Katarzynna Jankowska, Kiyoshi Okuda, Dariusz Jan Skarzynski

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

To determine whether glucocorticoids affect the function of the bovine corpus luteum (CL) during the estrous cycle and early pregnancy, we examined the effects of exogenous cortisol or reduced endogenous cortisol on the secretion of progesterone (P4) and on pregnancy rate. In preliminary experiments, doses of cortisol and metyrapone (an inhibitor of cortisol synthesis) were established (n=33). Cortisol in effective doses of 10 mg blocked tumor necrosis factor-induced prostaglandin F secretion as measured by its metabolite (PGFM) concentrations in the blood. Metyrapone in effective doses of 500 mg increased the P4 concentration. Thus, both reagents were then intravaginally applied in the chosen doses daily from Day 15 to 18 after estrus (Day 0) in noninseminated heifers (n=18) or after artificial insemination (n=36). Pregnancy was confirmed by transrectal ultrasonography between Days 28-30 after insemination. Plasma concentrations of P4 were lower in cortisol-treated heifers than in control heifers on Days 17 and 18 of the estrous cycle (P<0.05). However, the interestrus intervals were not different between control and cortisol-treated animals (P>0.05). Moreover, metyrapone increased P4 and prolonged the CL lifespan in comparison to control animals (P<0.05). Interestingly, in inseminated heifers, cortisol increased the pregnancy rate (75%) compared with control animals (58%), whereas metyrapone reduced the pregnancy rate to 16.7% (P<0.05). The overall results suggest that cortisol, depending on the physiological status of heifers (pregnant vs. nonpregnant), modulates CL function by influencing P4 secretion. Cortisol may have a positive influence on CL function during early pregnancy, leading to support of embryo implantation and resulting in higher rates of pregnancy in heifers.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalJournal of Reproduction and Development
Volume58
Issue number2
DOIs
Publication statusPublished - 2012

Keywords

  • Cattle
  • Cortisol
  • Early pregnancy
  • Estrous cycle
  • Progesterone

ASJC Scopus subject areas

  • Animal Science and Zoology

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