Sonografische Verlaufsuntersuchungen zur Bedeutung der Follikelgröße und Gelbkörpermorphologie bei Milchkühen post inseminationem

Zusammenfassung

Gegenstand und Ziel Der Besamungserfolg bei Kühen wird durch viele Faktoren beeinflusst. Das Ziel der vorliegenden Studie war es, Erkenntnisse über die Beziehungen von präovulatorischen Follikeln, Gelbkörpern und deren Hohlräumen sowie einer Trächtigkeit bei Milchkühen unter Feldbedingungen zu gewinnen.

Material und Methoden Die Daten wurden bei 176 laktierenden Milchkühen erhoben, welche zur künstlichen Besamung angemeldet wurden. Die Kühe wurden mittels Sonografie am Tag der Besamung, 24 Stunden nach der Besamung, am Tag 9, am Tag 34 und ab Tag 42 nach Besamung gynäkologisch untersucht. Zudem wurde am Tag der Besamung und am Tag 9 Blut aus der Vena coccygea zur Progesteronbestimmung entnommen.

Ergebnisse In Abhängigkeit des Ergebnisses der Trächtigkeitsuntersuchung konnte bei den untersuchten Milchkühen mit spontanen Ovulationen kein Unterschied zwischen den Größen der Follikel, der Gelbkörper und deren Hohlräumen sowie den Progesteronkonzentrationen 9 Tage nach der Besamung festgestellt werden. Im Gegensatz zu den Gelbkörpern ohne Hohlraum bleibt die Gelbkörperfläche während des Untersuchungszeitraums bei den Gelbkörpern mit Hohlraum konstant, wobei gleichzeitig der Hohlraum massiv an Größe verliert. Zudem wurden Rasseunterschiede in den Gelbkörpergrößen am Tag 34 nachgewiesen.

Schlussfolgerungen Es konnte keine Ursache über die Bildung von Hohlräumen in Gelbkörpern und derer Verbindungen zu vorangegangenen Funktionskörpern gefunden werden.

Klinische Relevanz Sowohl die Veränderungen der Gelbkörpergrößen über die Zeit als auch deren rassebedingte Unterschiede könnten einen Einfluss auf den Besamungserfolg haben.

Abstract

Objective In dairy cattle, numerous factors determine the success of an insemination. The aim of the present study was to generate findings concerning the association between the preovulatory follicles, the corpora lutea with or without cavities and pregnancy in dairy cows under field conditions.

Material and methods Data was obtained from 176 dairy cows scheduled for artificial insemination. The cows were gynecologically examined using sonography at the time of insemination, 24 hours later, on day 9, on day 34 and after day 42 after insemination. Additionally, blood samples were collected from the coccygeal vein at the time of insemination and on day 9 in order to determine blood progesterone level.

Results Depending on the result of the pregnancy test, no difference was detected between the dimensions of the follicles, corpora lutea as well as their cavities and progesterone levels 9 days after insemination in the dairy cows with spontaneous ovulations. In contrast to the corpus luteum without cavity, the surface area of the corpus luteum with cavity remained constant during the study period, while at the same time the cavity decreased in size to a significant degree. In addition, breed differences in corpus luteum sizes were detected on day 34.

Conclusion No cause was detected for the formation of cavities in corpora lutea and there was no link to the follicle from which the corpus luteum developed.

Clinical relevance Both the changes in corpus luteum sizes over time and their breed-related differences could have an impact on insemination outcome.

Schlüsselwörter

Ultraschall - Gelbkörper mit Hohlraum - Ovar - Besamungserfolg

Key words

Ultrasound - corpus luteum with cavity - ovary - insemination outcome

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