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KMID : 0893420180190020301
Journal of Veterinary Science
2018 Volume.19 No. 2 p.301 ~ p.308
Cytological endometritis in dairy cows: diagnostic threshold, risk factors, and impact on reproductive performance
Lee Soo-Chan

Jeong Jae-Kwan
Choi In-Soo
Kang Hyun-Gu
Jung Young-Hun
Park Soo-Bong
Kim Ill-Hwa
Abstract
We determined the threshold proportion of polymorphonuclear leukocytes (PMNs) for a diagnosis of cytological endometritis (CEM), the risk factors for this condition, and its impact on reproductive performance in dairy cows. Uterine cytology was performed on 407 Holstein cows 4 weeks postpartum to determine the proportions of endometrial cells and PMNs. A receiver operator characteristics curve was used to determine the threshold above which the PMN proportion affected the likelihood of cows conceiving by 200 days postpartum. The optimal threshold was ¡Ã 14% PMN (sensitivity, 31.3%; specificity, 81.7%; p £¼ 0.05). The farm identity, retained placenta (odds ratio [OR] = 1.87), and septicemic metritis (OR = 3.07) were risk factors for CEM (p £¼ 0.05). Cows with CEM were less likely to resume cyclicity (OR = 0.58) and to conceive by 200 days postpartum (hazard ratio = 0.58). Cows with CEM tended (p £¼ 0.1) to be less likely to become pregnant after their first insemination (OR = 0.65) and to require a greater number of inseminations per conception (2.3 vs. 2.2). In conclusion, a PMN threshold of 14% defined the presence of CEM at 4 weeks postpartum. The farm, retained placenta, and septicemic metritis were risk factors for CEM, which reduces subsequent reproductive performance.
KEYWORD
cytological endometritis, dairy cow, polymorphonuclear leukocyte, reproductive performance, risk factors
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