Timing of artificial insemination using fresh or frozen semen after automated activity monitoring of estrus in lactating dairy cows
| Autor: | Wolfgang Heuwieser, S. Borchardt, J.-L. Plenio, C.M. Tippenhauer, A.M.L. Madureira, Ronaldo L.A. Cerri |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_treatment
Semen Biology Gonadotropin-Releasing Hormone 03 medical and health sciences Activity monitoring Animal science Milk yield Estrus Pregnancy Germany Fresh semen Genetics medicine Animals Lactation Israel Insemination Artificial Progesterone 030304 developmental biology Estrous cycle 0303 health sciences Artificial insemination 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science Heat stress Activity monitor Cattle Female Animal Science and Zoology Estrus Synchronization Semen Preservation Food Science |
| Zdroj: | Journal of Dairy Science. 104:3585-3595 |
| ISSN: | 0022-0302 |
| Popis: | The objective of this observational experiment was to determine the association between the time of artificial insemination (AI) and pregnancy per AI (P/AI) in lactating Holstein cows inseminated with either fresh or frozen semen considering different characteristics of an estrus event (i.e., onset, peak, and end) using an automated activity monitoring system. A total of 3,607 AI services based on the alert of an automated activity monitoring system (Heatime; SCR Engineers Ltd., Netanya, Israel) were evaluated from 4 commercial dairy farms in Germany. Pregnancy diagnosis was performed by transrectal palpation 38 ± 3 d after AI or by transrectal ultrasonography 30 ± 3 d after AI. Estrus intensity was categorized based on peak activity of estrus (PAE) into low (35-89 index value) and high (90-100 index value) intensity. The mean (± standard deviation) duration of an estrus event was 14.3 ± 4.6 h. The mean (± standard deviation) interval from onset of estrus (OE; moment where index value was ≥35) to AI was 16.8 ± 8.0 h, from PAE to AI was 11.9 ± 8.1 h, and from end of estrus (EE; moment where index value returned to |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|