Pierson R A, Ginther O J
J Am Vet Med Assoc. 1987 Apr 15;190(8):995-1001.
The uteri of 22 Holstein heifers were monitored during 58 interovulatory intervals by transrectal ultrasonographic imaging. The ultrasonographic appearance of the uterus was influenced by the stage of the estrous cycle. Profound changes in characteristics visualized by ultrasonography included thickness of the uterine body, ultrasonographic evidence of edema, and accumulation of intravaginal and intrauterine fluids. Scores representing intravaginal fluid, intrauterine fluid, ultrasonographic texture, and number of gray-scale zones (comprising the image of the uterus) increased before ovulation, then decreased until approximately day 3 to day 6 (ovulation = day 0). The scores for uterine shape and number of cross sections of a uterine horn in one 5-MHz field began to increase before ovulation, reached a high plateau during the period associated with maximal progesterone production, and decreased before the time associated with estrus and ovulation.
通过经直肠超声成像对22头荷斯坦小母牛的子宫在58个排卵间期进行了监测。子宫的超声表现受发情周期阶段的影响。超声检查所见特征的显著变化包括子宫体厚度、水肿的超声证据以及阴道内和子宫内液体的积聚。代表阴道内液体、子宫内液体、超声图像质地以及灰度区数量（构成子宫图像）的评分在排卵前升高，然后下降，直至约第3天至第6天（排卵 = 第0天）。在一个5兆赫兹视野中子宫角的子宫形状评分和横截面数量在排卵前开始升高，在孕酮分泌量最大的时期达到高峰平台期，并在发情和排卵相关时间之前下降。
