Blom E, Wolstrup C
Nord Vet Med. 1976 Oct;28(10):515-8.
The zinc content was determined in semen samples from four young Danish Jersey bulls showing the typical 'Dag defect' (greater than 50% strongly coiled or bent sperm tails). Two of the bulls were half brothers. Semen samples from 14 normal fertile Jersey bulls served as controls. The normal material showed a zinc content in the centrifuged sperm of 190 +/- 15.8 mug/g d.w. and in the seminal plasma 81 +/- 31.2 mug/g d.w. In the four abnormal bulls the following elevated values were found: in the centrifuged sperm 310 +/- 109.5 mug/g d.w. and in the seminal plasma 137 +/- 75.2 mug/g d.w. (see figs. 1 and 2). One of the Dag defect's main localizations, the outer dense tail fibers, has a very high zinc content and this fact together with the heredity of the defect make further studies most promising.
对4头患有典型“达格缺陷”（超过50%的精子尾部强烈卷曲或弯曲）的丹麦年轻泽西种公牛的精液样本进行了锌含量测定。其中2头公牛是同父异母的兄弟。来自14头正常生育能力的泽西种公牛的精液样本作为对照。正常样本显示，离心后的精子中锌含量为190±15.8微克/克干重，精浆中为81±31.2微克/克干重。在4头异常公牛中，发现了以下升高的值：离心后的精子中为310±109.5微克/克干重，精浆中为137±75.2微克/克干重（见图1和图2）。“达格缺陷”的主要定位之一，即外侧致密尾纤维，锌含量非常高，这一事实连同该缺陷的遗传性使得进一步的研究极具前景。
