Department of Animal Production, University of Lleida, Lleida, Spain.
Res Vet Sci. 2012 Aug;93(1):67-73. doi: 10.1016/j.rvsc.2011.07.017. Epub 2011 Sep 8.
The possible relationship between Coxiella-seropositivity and the reproductive performance of cows during the previous year to the serological screening was examined in three high producing dairy herds. The herds had a history of subfertility (<25% of pregnancies for the total number of AI), abortion (>18% abortions) and a positive polymerase chain reaction test for Coxiella burnetii in the bulk tank milk with an excretion higher than 10(4)Coxiella /ml for all three herds. Antibodies against C. burnetii were detected in 50.2% of the 781 parous cows analyzed. Coxiella seropositivity was linked to placenta retention, to changes in the interval from parturition to conception (with the lowest interval parturition-conception for cows with low level of seropositivity), early pregnancy (cows becoming pregnant before Day 90 postpartum) and maintenance of gestation during the early fetal period, while it failed to affect rates of abortion after Day 90 of gestation or stillbirth.
在三个高产奶牛场中，研究了前一年的柯克斯体血清阳性与奶牛繁殖性能之间的可能关系。这些牛群存在不孕（人工授精总次数的 25%以下怀孕）、流产（>18%流产）和牛布鲁氏菌聚合酶链反应检测阳性的病史，且所有三个牛场均存在 10(4)个以上柯克斯体/毫升的大量奶罐牛奶排泄。对分析的 781 头经产奶牛中的 50.2%检测到了针对 C. burnetii 的抗体。柯克斯体血清阳性与胎盘滞留、从分娩到受孕的间隔变化（低水平血清阳性的奶牛的最低间隔分娩受孕）、早期妊娠（产后 90 天前怀孕的奶牛）和早期胎儿期的妊娠维持有关，而不会影响妊娠 90 天后的流产率或死产率。
