Publikationsdatenbank

Association of estrous expression detected by an automated activity monitoring system within 40 days in milk and reproductive performance of lactating Holstein cows (2021)

Art

Poster

Autoren

Borchardt, S. (WE 19)

Tippenhauer, C. M. (WE 19)

Plenio, J.- L. (WE 16)

Bartel, A. (WE 16)

Madureira, A. M. L.

Cerri, R. L. A.

Heuwieser, W. (WE 19)

Kongress

ADSA 2021 Annual Meeting

Virtuell, 11. – 14.07.2021

Quelle

Journal of dairy science : JDS

Bandzählung: 104

Heftzählung: 8

Seiten: 9195 – 9204

ISSN: 0022-0302

Sprache

Englisch

Verweise

URL (Volltext): https://www.sciencedirect.com/science/article/abs/pii/S0022030221005841

DOI: 10.3168/jds.2020-19705

Kontakt

Institut für Veterinär-Epidemiologie und Biometrie

Königsweg 67
14163 Berlin
+49 30 838 56034
epi@vetmed.fu-berlin.de

Abstract / Zusammenfassung

The objective of this observational study was to evaluate the association of estrous expression within 40 d in milk using a neck-mounted automated activity monitor (AAM; Heatime Pro; SCR Engineers Ltd., Netanya, Israel) with estrous characteristics of the first postpartum AI and reproductive performance in lactating Holstein cows. A total of 2,077 cows from 5 commercial dairy farms were included in the statistical analyses. Cows were classified according to the number of estrus events from d 7 until d 40 postpartum into 3 categories: 1) no estrus event (ANESTRUS); 2) one estrus event (ESTRUS1) and 3) 2 or more estrus events (ESTRUS2+). Generalized linear mixed models were used to analyze continuous or categorical data. Shared frailty models were used for time to event data. Overall, 52.7% (1,095/2,077) of cows had no estrus event detected by an AAM system from d 7 until d 40 postpartum. Herd-level prevalence of ANESTRUS ranged from 37.5% to 58.4%. Estrous expression from d 7 until d 40 postpartum affected estrous duration (P = 0.001) at first postpartum AI. Cows in ANESTRUS had the shortest duration (13.2 ± 0.33 h) compared with cows in ESTRUS1 (13.8 h ± 0.36) and ESTRUS2+ (14.8 h ± 0.41). Cows in ESTRUS2+ had a longer estrous duration at first postpartum AI compared with cows in ESTRUS1. For ANESTRUS, ESTRUS1, and ESTRUS2+ cows pregnancy per AI was 29.4%, 30.9%, and 37.8%, respectively. Estrous expression from d 7 until d 40 postpartum affected time to first AI and time to pregnancy. Compared with ANESTRUS cows, cows in ESTRUS1 (Hazard risk (HR) = 1.74; 95% CI 1.55 - 1.94; P = 0.001) and ESTRUS2+ (HR = 1.77; 95% CI 1.52 - 2.05; P = 0.001) had an increased hazard of being inseminated within 100 DIM. Median DIM to first AI were 70, 59 and 58 for cows in ANESTRUS, ESTRUS1, and ESTRUS2+, respectively. Compared with ANESTRUS cows, cows in ESTRUS1 (HR = 1.28; 95% CI 1.13 - 1.46; P = 0.001) and ESTRUS2+ (HR = 1.33; 95% CI 1.12 - 1.57; P = 0.001) had an increased hazard of becoming pregnant within 200 DIM. Median DIM to pregnancy were 127, 112, and 103 for ANESTRUS cows, ESTRUS1 and ESTRUS2+, respectively. In conclusion, cows with no estrous expression from 7 to 40 DIM had reduced estrous expression at first AI and inferior reproductive performance compared with cows that displayed estrous activity.