3β-HSD Activity and Gestagen Concentrations of Bovine Fetal and Maternal Placentae During Pregnancy and on Parturition

Authors

  • S. Tsumagari College of Agricuture and Veterinary Medicine, Nihon University, Fujisawa, Kanagawa 252, Japan
  • K. Takagi College of Agricuture and Veterinary Medicine, Nihon University, Fujisawa, Kanagawa 252, Japan
  • K. Tanemura College of Agricuture and Veterinary Medicine, Nihon University, Fujisawa, Kanagawa 252, Japan
  • A. Yosai College of Agricuture and Veterinary Medicine, Nihon University, Fujisawa, Kanagawa 252, Japan
  • M. Takeishi College of Agricuture and Veterinary Medicine, Nihon University, Fujisawa, Kanagawa 252, Japan

DOI:

https://doi.org/10.21423/aabppro19926570

Keywords:

progesterone, placentae, P syntheses, 3, gestagen levels

Abstract

As bovine uterine arterio-venous progesterone (P) levels indicate no differences, P is reportedly not produced in placenta.1,2 However, many documents3-7 have demonstrated and confirmed the P synthesis in tissue cultures of placentae. In contrast to attenuated bovine corpus luteal functions in the later half of gestation,4,8 the P level in blood indicates a substantial increase until near term.9,10 Such an increase in P level at late period of gestation has been attributed to derive from the placenta10,11 and the adrenal. Our present study therefore attempted to investigate P syntheses in both fetal and maternal placentae by measuring the synthesis-related enzyme, 3

Cover image of the Third Volume of the 25th Conference Proceedings: An earl-morning photo of farmland. A small farm is nestled among rolling hills, fields stretching across a curving road that disappears between dark green trees. The barn is a cheery red color with a tin roof. Beneath the photo is the a statement of the conference's theme in white italics: Challenges of the Bovine Industry in the Twenty-First Century. Deep red background.

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Published

1992-08-31

Issue

1992: Volume 3

Section

Genetics and Theriogenology