Randomized controlled trial of reinsemination strategies in dairy cows diagnosed nonpregnant using color flow Doppler ultrasonography on d 21 after insemination.
Journal
JDS communications
ISSN: 2666-9102
Titre abrégé: JDS Commun
Pays: United States
ID NLM: 9918300983806676
Informations de publication
Date de publication:
Nov 2021
Nov 2021
Historique:
received:
08
07
2021
accepted:
16
08
2021
entrez:
7
11
2022
pubmed:
8
11
2022
medline:
8
11
2022
Statut:
epublish
Résumé
The objective of this study was to quantify the reproductive performance of 4 reinsemination strategies in cows diagnosed nonpregnant using corpus luteum color flow Doppler ultrasonography on d 21 after last insemination. A total of 2,140 color flow Doppler ultrasonography exams from 845 Holstein cows from 10 commercial dairy herds were used in this study. Farms were visited every 2 wk by the research team. On d 7 after insemination, cows were enrolled in a randomized controlled trial to be assigned 1 of 4 treatments if they were subsequently diagnosed nonpregnant on d 21. All cows were then examined on d 21 using Doppler ultrasonography to diagnose nonpregnancy. Treatment A (CON) was the control group: nonpregnant cows were programmed to receive a standard Ovsynch protocol starting on d 32. Nonpregnant cows in treatment B (GnRH) were injected i.m. with GnRH on d 21 after insemination and reinseminated immediately. Cows in treatment C (2×GnRH) received an i.m. injection of GnRH on d 11 after insemination. If diagnosed nonpregnant on d 21 after insemination, they were injected i.m. with GnRH on d 21 after insemination and inseminated immediately. Cows in treatment D (Resynch) received an i.m. injection of GnRH on d 14 after insemination. If diagnosed nonpregnant on d 21 after insemination, they were injected i.m. with PGF
Identifiants
pubmed: 36337116
doi: 10.3168/jdsc.2021-0149
pii: S2666-9102(21)00159-9
pmc: PMC9623643
doi:
Types de publication
Journal Article
Langues
eng
Pagination
381-386Informations de copyright
© 2021.
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