dc.contributor.author
Borchardt, S.
dc.contributor.author
Burnett, T. A.
dc.contributor.author
Heuwieser, W.
dc.contributor.author
Plenio, J. L.
dc.contributor.author
Conceição, R. S.
dc.contributor.author
Cerri, R. L. A.
dc.contributor.author
Madureira, A. M. L.
dc.date.accessioned
2024-06-04T14:18:01Z
dc.date.available
2024-06-04T14:18:01Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/43755
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-43470
dc.description.abstract
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 d in milk; DIM). Calving was classified as assisted (forced extraction of a calf) or 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 concentration was ≥1 ng/mL on any collection day. Cows were considered anovular when P4 concentration was <1 ng/mL on all collection days. Cows were classified as true positive: P4 ≥ 1 ng/mL and at least one estrus alert; false positive: P4 < 1 ng/mL and at least one estrus alert; true negative: P4 < 1 ng/mL and no estrus alerts; and false negative: P4 ≥ 1 ng/mL and no estrus alerts. Statistical analyses were performed by frequency distribution and mixed effects logistic regression procedures on SAS (SAS Institute Inc.). The specificity, sensitivity, accuracy, and positive predictive value of the sensor to detect cows that 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 was not effective at detecting cyclic cows, perhaps due to silent ovulation early postpartum.
en
dc.format.extent
6 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
postpartum estrus events
en
dc.subject.ddc
600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche
dc.title
Efficacy of an automated technology at detecting early postpartum estrus events
dc.type
Wissenschaftlicher Artikel
dc.title.subtitle
Can we detect resumption of cyclicity?
dcterms.bibliographicCitation.doi
10.3168/jdsc.2023-0463
dcterms.bibliographicCitation.journaltitle
JDS Communications
dcterms.bibliographicCitation.number
3
dcterms.bibliographicCitation.pagestart
225
dcterms.bibliographicCitation.pageend
229
dcterms.bibliographicCitation.volume
5 (2024)
dcterms.bibliographicCitation.url
https://doi.org/10.3168/jdsc.2023-0463
refubium.affiliation
Veterinärmedizin
refubium.funding
Publikationsfonds FU
refubium.note.author
We acknowledge support by the Open Access Publication Fund of the Freie Universität Berlin.
en
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2666-9102