Onderzoek naar de grootte van het corpus luteum en de progesteronproductie in relatie tot drachtigheid

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RELATIONSHIP BETWEEN ULTRASONIC CHARACTERISTICS OF THE CORPUS LUTEUM, PLASMA PROGESTERONE CONCENTRATION AND EARLY PREGNANCY DIAGNOSIS IN FRIESIAN MARES

M. Sevinga, Y.H. Schukken, J.W. Hesselink and F.H. Jonker

* M. Sevinga: Veterinary Practice Mid-Fryslân, Akkrum, The Netherlands

* Y.H. Schukken: College of Veterinary Medicine, Cornell University, Ithaca, NY, USA

* J.W. Hesselink: Animal Health Service, Drachten, The Netherlands

* F. Jonker: Department of Herd Health and Reproduction, Utrecht University, The Netherlands

Received for publication: Febr. 1999

Accepted: April 1999

 

ABSTRACT

The purpose of the present study was to evaluate the change in cross-sectional area of the early corpus luteum (CL) and progesterone production in relation to subsequent pregnancy diagnosis.

The cross-sectional area of the CL of 75 Friesian brood mares was measured by ultrasonography on Day 1 or 2 and Day 8 or 9 after ovulation. The change in cross-sectional area was expressed in a volume ratio.

Plasma progesterone concentrations were measured on Days 8 to 9, and ultrasonography to determine pregnancy status was carried out on Day 17. The data obtained were analyzed by using a multiple logistic regression model.

There were significant differences in the age, volume ratio and progesterone concentration between pregnant and nonpregnant mares. Pregnancy on Day 17 was related to the change in size of the CL up to Days 8 to 9 and progesterone concentration on Days 8 to 9.

These differences between pregnant and nonpregnant mares might reflect the first luteal response to pregnancy. Key words: corpus luteum, Friesian mares, ultrasound, progesterone, pregnancy.

Published in: Theriogenology, volume 52, September 1999, issue 4, page 585 to 592