Publikationsdatenbank

Timing of artificial insemination and using sexed or conventional semen after automated activity monitoring of estrus in nulliparous Holstein heifers (2022)

Art

Vortrag

Autoren

Tippenhauer, Christie (WE 19)

Plenio, Jan-Lukas (WE 16)

Madureira, Augusto

Cerri, Ronaldo

Heuwieser, Wolfgang (WE 19)

Borchardt, Stefan (WE 19)

Kongress

European Conference on Precision Livestock Farming & International Conference on Precision Dairy Farming 2022

Wien, 29.08. – 02.09.2022

Quelle

Precison Livestock Farming 2022 — D. Berckmans, M. Oczak, M. Iwersen, K. Wagener (Hrsg.)

1 Auflage

— S. 771–774

ISBN: 978-83-965360-0-6

Sprache

Englisch

Verweise

URL (Volltext): https://ecplf2022.exordo.com/programme/presentation/94

Kontakt

Tierklinik für Fortpflanzung

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Haus 27
14163 Berlin
+49 30 838 62618
fortpflanzungsklinik@vetmed.fu-berlin.de

Abstract / Zusammenfassung

The objective of this observational, retrospective study was to determine the association between the timing of artificial insemination (AI) and pregnancy per AI (P/AI) in nulliparous Holstein heifers inseminated either with sexed or conventional semen considering different characteristics of an estrus event (i.e., onset, peak, and end) using an automated activity monitoring system. A total of 4,265 AI services from 2,919 heifers based on the alert of Heatime (SCR Engineers Ltd., Netanya, Israel) were evaluated from 6 commercial dairy farms in Germany. The mean (± standard deviation) duration of an estrus event was 16.0 ± 4.8 h. Overall P/AI was 49.1%. Heifers inseminated with conventional semen (51.4%; 933/1,644) had similar P/AI compared to heifers inseminated with sexed semen (46.9%; 1,277/2,621; P = 0.14). Heifers at a younger age at AI were more likely to get pregnant (P = 0.01). The interval from onset of estrus to AI was associated (P = 0.01) with P/AI, with the greatest P/AI for heifers inseminated within 9 to 32 h after the onset of the activity alert. Whereas the interval from peak activity to AI was not associated (P = 0.58) with P/AI, there tended (P = 0.08) to be an association between the interval from end of estrus to AI and P/AI. There were no interactions between the intervals from onset, peak or end of estrus to AI and type of semen on P/AI. In conclusion, inseminating heifers within 9 to 32 h after onset of estrus increased P/AI irrespective of type of semen.