Local effect of the conceptus on uterine vascular perfusion during early pregnancy in heifers

Reproduction : the Official Journal of the Society for the Study of Fertility
L A Silva, O J Ginther

Abstract

Colour-Doppler ultrasonography was used to study the spatial relationship between vascular perfusion in the middle of each uterine horn and the reported location of the embryo proper and expanding conceptus using endometrial vascularity scores 1-4 (nil-maximal). Vascularity increased in both uterine horns between days 14 and 18 (day 0=ovulation) in nonpregnant heifers (n=6) but not in pregnant heifers (n=11). The increase was temporally associated with decreasing plasma progesterone and increasing oestradiol. In pregnant heifers, a transient increase in endometrial vascularity in the ipsilateral horn (horn with embryo) was not detected before day 18, despite a reported transient increase in blood flow in the ipsilateral uterine artery between days 13 and 17. Endometrial vascularity in the ipsilateral horn first increased (P<0.05) between days 18 and 20. Day 20 is the reported day of adhesiveness between chorion and uterus. An increase (P<0.05) in the contralateral horn between days 18 and 22 was slight, but a greater increase occurred after day 32. Day 32 is the reported day of entry of the allantochorion into the contralateral horn. By day 42, scores were similar between the two horns, and the allantochorion reportedly fills b...Continue Reading

References

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Citations

Mar 9, 2011·Reproduction : the Official Journal of the Society for the Study of Fertility·Anna E GroebnerSusanne E Ulbrich
Jul 16, 2014·Theriogenology·Bruna Marcele OliveiraEneiva Carla Carvalho Celeghini
Jun 14, 2014·Reproduction in Domestic Animals = Zuchthygiene·G PugliesiM Binelli
Nov 28, 2012·Methods : a Companion to Methods in Enzymology·Susanne E UlbrichStefan Bauersachs
May 4, 2018·Reproduction, Fertility, and Development·Claire StenhouseCheryl J Ashworth
Jan 3, 2020·Animal Health Research Reviews·Chike F OguejioforD Claire Wathes
Feb 9, 2021·Frontiers in Veterinary Science·Daniela E BarrazaMartin E Argañaraz

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