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Selected Publication:

Type of publication: Journal Article
Type of document: Full Paper

Year: 1998

Authors: Kuhholzer, B; Schmoll, F; Besenfelder, U; Möstl, E; Kruger, E; Brem, G; Schellander, K

Title: Ultrasonographic examination of ovarian structure dynamics in superovulated ewes.

Source: Reprod Domest Anim (33), 5 343-346.

Authors Vetmeduni Vienna:

Besenfelder Urban
Möstl Erich
Schmoll Friedrich

Vetmed Research Units
Institute for Medical Biochemistry
Institute of Animal Breeding and Genetics
University Clinic for Swine

In this study, ultrasonography was used to monitor the superovulation progress in ewes in order to exclude animals with low or pathological ovarian response. Ovaries of 17 mixed-breed ewes, superovulated with pregnant mare's serum gonadotropin (PMSG), were scanned daily by transrectal ultrasonography over a period of 10 days around oestrus. Plasma progesterone concentrations were measured daily. On the last day of the examination period, a laparoscopic examination of the ovaries was performed. The dynamics of the follicles and corpora lutea (CL) could be followed clearly. Animals with follicles >8 mm at the day of insemination (Day 0) showed a progression of this status until Day 5. No prediction of the ovulation rate was possible at this time. At Day 5 the number of CL was detected with an acceptable accuracy. It is recommended that a routine scanning of the ovaries prior to insemination, selecting donors with follicles between 4 and 8 mm diameter and no follicles larger than 8 mm for insemination. An ultrasonographic examination prior to embryo recovery (Day 5) allows the exclusion of donors with low ovulation rates (1-2 CL), avoiding unnecessary interventions.

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