Prevalence of endometritis diagnosed by vaginal discharge scoring or uterine cytology in dairy cows and herds
| Autor: | Scott McDougall, D. Aberdein, Chris R. Burke, A. Bates |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Vaginal discharge
Breeding program medicine.medical_treatment Cattle Diseases 03 medical and health sciences Animal science Pregnancy Cytology Prevalence Genetics medicine Animals Humans 030304 developmental biology 0303 health sciences Receiver operating characteristic business.industry Artificial insemination Uterus 0402 animal and dairy science Bayes Theorem 04 agricultural and veterinary sciences medicine.disease 040201 dairy & animal science Confidence interval Vaginal Discharge Herd Cattle Female Animal Science and Zoology Endometritis medicine.symptom business New Zealand Food Science |
| Zdroj: | Journal of Dairy Science. 103:6511-6521 |
| ISSN: | 0022-0302 |
| Popis: | Endometritis, diagnosed either by assessing the proportion of nucleated cells that are neutrophils (PMN%) following cytology of the endometrium or by assessing the degree of purulent material within the vagina (purulent vaginal discharge or PVD score), is prevalent among dairy cows. However, limited data exist as to the degree of variation among herds in the prevalence of endometritis diagnosed by these 2 methods. Thus, we undertook a study involving uterine cytological and vaginal sampling at a median of 41 d in milk of 1,807 cows from 100 seasonally breeding dairy herds in New Zealand. The optimal cut-point for PMN% was determined by receiver operator characteristic (ROC) curve analysis using conception to first artificial insemination (AI) as the outcome variable. The prevalence of disease was then calculated at the cow and herd levels, and an estimate of the effect of clustering of cow within a herd was calculated. Reproductive outcomes were collated and associations between endometritis and reproductive outcomes assessed using multivariable models. The optimal PMN% cut-point was ≥2%. The correlation of results for cows within a herd (the intraclass correlation) was 0.03, which was significant; hence, subsequent modeling accounted for this clustering. The cow-level prevalence of PMN% ≥2% was 27.0% [95% confidence interval (CI): 25.0 to 29.1%], whereas the mean within-herd prevalence of PMN% ≥2% was 27.1% (95% CI: 24.7 to 29.6%; range: 5.0 to 63.6%), and the prevalence among herds varied significantly. An elevated PMN% (≥2%) was significantly associated with a reduction in the proportion of cows conceiving to first AI (45.8 vs. 54.5%), a reduced proportion of cows submitted for AI in the first 3 wk of the seasonal breeding program (83.7 vs. 89.3%), and a lower proportion pregnant in the first 3 (44.4 vs. 55.4%) and 6 wk (67.5 vs. 76.4%) of the breeding program relative to cows with a low PMN% (i.e. |
| Databáze: | OpenAIRE |
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