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Tierarztl Prax Ausg G Grosstiere Nutztiere 2020; 48(03): 166-171
DOI: 10.1055/a-1161-9797
Originalartikel

Geschlechtsbestimmung bei Pferdefeten mittels zwei- und dreidimensionaler Sonografie in der Frühgravidität

Gender determination in equine fetuses in early pregnancy using two- and three-dimensional ultrasound
Angela Becsek
1   Klinik für Reproduktionsmedizin, Vetsuisse-Fakultät, Universität Zürich
,
Adrian Schweizer
1   Klinik für Reproduktionsmedizin, Vetsuisse-Fakultät, Universität Zürich
,
Barbara Knutti
2   Tierärztliche Praxis KLC, Corcelles-près-Payerne, Schweiz
,
Heiner Bollwein
1   Klinik für Reproduktionsmedizin, Vetsuisse-Fakultät, Universität Zürich
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Zusammenfassung

Ziel Das Ziel dieser Studie war, erstmals zweidimensionale (2D) und dreidimensionale (3D) transrektale Ultraschalluntersuchungen (USU) hinsichtlich ihrer Richtigkeit und dem zeitlichen Aufwand zur Geschlechtsdiagnose bei Pferdefeten zu vergleichen.

Material und Methoden Zu diesem Zweck wurden 47 Stuten zwischen den Tagen 58 und 115 der Gravidität zunächst einer 2D-USU unterzogen, um das fetale Geschlecht anhand der Lokalisation des Genitaltuberkels oder dem Vorhandensein von äußeren Geschlechtsteilen zu ermitteln. Im Folgenden wurden 3D-Bilder des Fetus angefertigt und anschließend an einem PC ausgewertet.

Ergebnisse Der beste Zeitraum zur Geschlechtsbestimmung war zwischen dem 58. und 79. Graviditätstag mit 77 % (2D-USU und 3D-Bild-Auswertung) korrekten Diagnosen. Durch wiederholtes Auswerten der 3D-Bilder konnte eine Steigerung richtiger Diagnosen um 16 % erzielt werden. Der zusätzliche Zeitaufwand für die 3D-USU und die 3D-Bild-Auswertung betrug etwa 6–7 Minuten pro Stute.

Schlussfolgerung und klinische Relevanz Die Ergebnisse der Studie zeigen, dass die 3D- gegenüber der 2D-Sonografie die Zuverlässigkeit der transrektalen Geschlechtsbestimmung erhöht. Erfahrenen Untersuchern bringt die 3D-Ultraschalltechnik jedoch keine entscheidenden Vorteile und ist zudem zeitaufwendiger.

Abstract

Aim The aim of this study was to compare transrectal two-dimensional (2D) and three-dimensional (3D) ultrasound examination with regards to required time and accuracy of fetal sex determination in early pregnant mares.

Materials and methods For this purpose 47 mares were examined transrectally once between days 58 and 115 of gestation. Initially, the fetal sex was determined by identifying the location of the genital tubercle (GT) or external genitalia using 2D-ultrasound. Subsequently, the ultrasound machine was switched to 3D-mode to obtain images for later computer-based evaluation.

Results The gestational period between days 58 and 79 of pregnancy was the most appropriate time for sex determination with 77 % (2D and first 3D evaluation) correct diagnoses. The accuracy of the sex determination could be increased by about 16 % by a second evaluation of the 3D-images in a minimum time interval of 2 weeks. For each mare the additional time needed to perform the 3D-examination and to assess the 3D-images was approximately 6–7 minutes.

Conclusion and clinical relevance This study demonstrates that the accuracy of transrectal fetal gender determination is higher by using 3D-mode compared to the 2D-ultrasound. For experienced examiners however, 3D ultrasound technology does not offer any decisive advantages and is also more time-consuming.

Schlüsselwörter

Dreidimensionaler Ultraschall - Fetus - Genitaltuberkel - Trächtigkeit - 4D-View - Pferd

Key words

Three-dimensional ultrasound - fetus - genital tubercle - gravidity - 4D-View - horse


Publication History

Received: 16 December 2019
Received: 27 March 2020

Article published online:
18 June 2020

© Georg Thieme Verlag KG
Stuttgart · New York

 

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