Barański Wojciech, Zduńczyk Sławomir, Tobolski Dawid, Krupa Milena
Department of Animal Reproduction with Clinic, Faculty of Veterinary Medicine, University of Warmia and Mazury, ul. Oczapowskiego 14, Olsztyn, 10-719, Poland.
Private Veterinary Clinic, Warsaw, Poland.
Ir Vet J. 2024 Oct 10;77(1):20. doi: 10.1186/s13620-024-00281-0.
Clinical endometritis (CE) is common in post-partum dairy cows and is associated with impaired reproductive performance. The aim of the study was to evaluate the effect of subclinical endometritis (SE) in cows clinically cured of CE on their fertility. The study was performed on 215 Holstein Friesian cows with CE diagnosed by vaginoscopy and ultrasound between 21 and 28 days after parturition. All cows were clinically examined three times at an interval of 2 weeks. Cows without signs of CE were considered cured, and endometrial samples from the uteri were collected by cytobrush to diagnose SE using cytological evaluation of polymorphonuclear neutrophils (PMNs) percentage. The threshold for SE was set at ≥ 5% PMNs. Intervals calving to oestrus and calving to conception, first AI pregnancy rate, pregnancy rate 200 days after artificial insemination (AI), the number of AI per pregnancy (AI/P), pregnancy loss, and culling rate were calculated. SE was diagnosed in 40.9% of cows clinically cured of CE. There were significant differences in the AI/P (3.2 vs. 2.6; p < 0.027) and the pregnancy loss (18.2% vs. 4.7%; p < 0.002) between cows with SE and without SE. Cows with SE showed a tendency towards longer interval calving to conception, lower pregnancy rate 200 days after AI, and higher culling rate. In conclusion, SE after a clinical cure of CE may reduce fertility in dairy cows.
临床型子宫内膜炎（CE）在产后奶牛中很常见，且与繁殖性能受损有关。本研究的目的是评估临床治愈CE的奶牛中亚临床型子宫内膜炎（SE）对其繁殖力的影响。本研究对215头荷斯坦弗里生奶牛进行，这些奶牛在分娩后21至28天通过阴道镜检查和超声诊断为CE。所有奶牛每隔2周进行3次临床检查。无CE体征的奶牛被视为治愈，通过细胞刷从子宫采集子宫内膜样本，使用多形核中性粒细胞（PMN）百分比的细胞学评估来诊断SE。SE的阈值设定为≥5% PMN。计算了产犊至发情间隔、产犊至受孕间隔、首次人工授精妊娠率、人工授精（AI）后200天的妊娠率、每次妊娠的人工授精次数（AI/P）、妊娠损失和淘汰率。在临床治愈CE的奶牛中，40.9%被诊断为SE。有SE和无SE的奶牛在AI/P（3.2对2.6；p<0.027）和妊娠损失（18.2%对4.7%；p<0.002）方面存在显著差异。有SE的奶牛产犊至受孕间隔有延长的趋势，AI后200天的妊娠率较低，淘汰率较高。总之，CE临床治愈后的SE可能会降低奶牛的繁殖力。
