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首页> 外文期刊>Philippine Journal of Veterinary Medicine >Ovarian Changes from Days 20 to 90 of Gestation Observed Through Ultrasonography in Locally Raised Holstein-Sahiwal Dairy Cows
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Ovarian Changes from Days 20 to 90 of Gestation Observed Through Ultrasonography in Locally Raised Holstein-Sahiwal Dairy Cows

机译：通过超声检查在当地饲养的荷斯坦-萨希瓦尔奶牛从妊娠第20天到90天的卵巢变化

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摘要

The study was conducted to determine structural changes, ultrasound features and measurements of the ovaries from days 20 to 90 of pregnancy. Four crossbred pregnant dairy cows starting at day 20 post breeding were used in the experiment. B-mode ultrasonography of the ovaries was conducted per rectum. Ultrasound densities were classified into hypoechoic, hyperechoic and anechoic. Upon diagnosis of pregnancy, ovaries were classified into ipsilateral and contralateral sides. Presence of wave-like pattern of increase and decrease in the number of subordinate follicles was observed on both ovaries, suggesting the presence of follicular wave development. Dominant follicle appeared as circular anechoic area that was observed in the contralateral ovary ofsome of the animals on days 27 to 33 of gestation. The corpus luteum appeared as a hypoechoic structure which usually dominates the ipsilateral ovary during the latter part of gestation. Subordinate follicles appeared as small anechoic areas that were usually located near the periphery of the ovary that changed in number during each examination. Both ovaries differ mainly due to the presence of large corpus luteum and several numbers of subordinate follicles and dominant follicle. Ovarian follicular cycle continues even after conception and both ovaries were in different stages of follicular cycle as suggested by different numbers of subordinate follicles during each examination.
机译：进行该研究以确定从妊娠20天到90天的卵巢结构变化，超声特征和测量结果。在实验后的第20天开始使用四头杂交怀孕的奶牛。每个直肠行卵巢B超检查。超声密度分为低回声，高回声和无回声。诊断为妊娠后，卵巢分为同侧和对侧。在两个卵巢上均观察到次级卵泡数量呈波状增加和减少的趋势，表明存在卵泡波发展。在妊娠第27至33天时，在某些动物的对侧卵巢中观察到了主要的卵泡为圆形无回声区。黄体表现为低回声结构，通常在妊娠后期占同侧卵巢。下级卵泡表现为小的无回声区，通常位于卵巢周围，每次检查时其数目都会改变。两个卵巢的差异主要是由于存在大的黄体以及数个下级卵泡和显性卵泡。甚至在受孕后卵巢卵泡周期仍在继续，并且两个卵巢均处于卵泡周期的不同阶段，这是由每次检查中不同数量的下级卵泡提示的。

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