Publikationsdatenbank

Efficacy of an automated technology at detecting early postpartum estrus events:
Can we detect resumption of cyclicity? (2023)

Art

Poster

Autoren

Borchardt, Stefan (WE 19)

Burnett, Tracy

Heuwieser, Wolfgang (WE 19)

Plenio, Jan Lukas (WE 16)

Cerri, Ronaldo

Madureira, Augusto

Kongress

Dairy Cattle Reproduction Council Conference

Salt Lake City, 14. – 16.11.2023

Quelle

JDS communications

Bandzählung: 5

Heftzählung: 3

Seiten: 225 – 229

ISSN: 2666-9102

Sprache

Englisch

Verweise

URL (Volltext): https://www.sciencedirect.com/science/article/pii/S2666910223001345

DOI: 10.3168/jdsc.2023-0463

Kontakt

Tierklinik für Fortpflanzung

Königsweg 65
Haus 27
14163 Berlin
+49 30 838 62618
fortpflanzungsklinik@vetmed.fu-berlin.de

Abstract / Zusammenfassung

The objective of this observational study was to evaluate the efficacy of a neck-mounted automated activity monitor (AAM)
at detecting early postpartum resumed ovarian cyclicity. A total of 192 lactating cows (primiparous = 73 and multiparous = 119) were
enrolled in this study. Cows were continuously monitored by a neck mounted AAM early postpartum (7 to 30 DIM). Calving was classi-
fied as assisted (forced extraction of a calf) and unassisted (normal calving). Retained fetal membrane, metritis, hyperketonemia, clinical
mastitis, and milk production were recorded. Cows were classified as healthy (i.e., no disease events) or sick (i.e., any disease event).
Estrus events were alerted by the AAM using a proprietary algorithm set by the AAM company. Blood samples, from the coccygeal vein,
were collected at 15, 18, 21, 24, 28 and 30 DIM for progesterone (P4) analysis. Resumption of cyclicity was considered when P4 concen-
tration was ≥1ng/mL on any collection day. Cows were considered anovular when P4 concentration was <1ng/mL on all collection days.
Cows were classified as: True Positive – P4 ≥ 1ng/mL and at least one estrus alert; False Positive – P4 < 1ng/mL and at least one estrus
alert; True Negative – P4 < 1ng/mL and no estrus alerts and False Negative – P4 ≥ 1ng/mL and no estrus alerts. Statistical analyses were
performed by frequency distribution and mixed effects logistic regression procedures on SAS. The specificity, sensitivity, accuracy, and
positive predictive value of the sensor to detect cows which had resumed cyclicity were 84.0%, 34.1%, 52.1%, and 79.2%, respectively.
Out of the 192 cows, 35.9% (69/192) were anovulatory and 37.5% (72/192) had no estrus events between 7 to 30 DIM. Healthy cows
were more likely to resume cyclicity in early lactation compared with cows that were sick (78.3 ± 1.9 vs. 32.8 ± 3.1%, respectively)
independent of parity. In conclusion, the sensor had a high specificity for detecting anovular cows, but it had lower sensitivity, and thus
not effective at detecting cyclic cows, perhaps due to silent ovulation early postpartum.