AI Article Synopsis
- This study examined the impact of heat stress on pregnant dairy cows by comparing ultrasound findings in winter (group W) and summer (group S).
- Results showed that summer cows experienced higher cortisol levels and lower progesterone, along with reduced echogenicity of the corpus luteum and placentomes.
- Additionally, the umbilical artery's diameter and blood volume were smaller in summer cows, indicating that heat stress may negatively affect fetal blood supply and the structure of reproductive tissues.
Article Abstract
The objectives of this study were to assess alterations in, echogenic appearance, size and blood flow in the corpus luteum, the placentomes and the blood flow in umbilical and uterine arteries that heat stress can cause in cooled pregnant dairy cows. Pregnant cows were allocated in two groups and the gravid uteri, along with the ipsilateral corpora lutea were examined during the winter (group W, n = 9) or the summer (group S, n = 10). The grey-scale ultrasound and colour flow imaging of the corpus luteum and placentome were performed. In addition, the umbilical and uterine artery diameters and haemodynamic parameters in the vessels were calculated. At the time of ultrasonographic examination, cortisol concentrations were higher, and progesterone levels tended to be lower in group S compared to group W. The grey-scale ultrasound evaluation of corpora lutea and placentomes was lower in group S compared to group W. The diameter of umbilical artery and the blood volume in the vessel were less in group S than in group W. We infer that heat stress affects foetal blood supply and possibly the structure of placentomes and corpora lutea, but it differently affects the blood flow characteristics in the umbilical and uterine arteries.
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| http://dx.doi.org/10.1111/rda.13996 | DOI Listing |
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