IMPAIRED REPRODUCTION OF MALLARDS FED AN ORGANIC FORM OF SELENIUM
IMPAIRED REPRODUCTION OF MALLARDS FED AN ORGANIC FORM OF SELENIUM
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DOI：
10.2307/3801145
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发表时间：
1989-04-01
影响因子：
2.3
通讯作者：
GOLD, LG
中科院分区：
文献类型：
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作者：
HEINZ, GH;HOFFMAN, DJ;GOLD, LG
我们喂野鸭（Anas platyrhynchos）的饮食补充0-，1-，2-，4-，8-，或16-ppm硒的形式硒蛋氨酸。我们喂另一组野鸭的饮食中含有16 ppm的硒硒胱氨酸。饲喂对照饮食的雌性产生平均8.1只存活至6日龄的雏鸭，这显著大于饲喂8 ppm硒作为硒代蛋氨酸的雌性产生的4.6只雏鸭和饲喂16 ppm硒作为硒代蛋氨酸的雌性产生的零存活雏鸭。硒代胱氨酸不损害生殖。饮食中含有8-和16-ppm硒硒蛋氨酸造成畸形，分别为6.8%和67.9%，未孵化的鸡蛋相比，0.6%的控制。最常见的畸形是眼睛、嘴、腿和脚。硒不影响产蛋的开始或频率，蛋的大小，壳的厚度，蛋的生育力，或雏鸭的性比。降低存活率和生长发生在雏鸭孵化组的父母已收到8或16 ppm的硒作为硒代蛋氨酸，即使所有的雏鸭喂养控制饮食。从饲料中硒的含量可以预测成鱼的鸡蛋和肝脏中硒的含量。我们的结论是硒的饮食阈值为硒蛋氨酸必要损害生殖是4和8 ppm之间。很难确定鸡蛋中硒的水平，这将是诊断生殖障碍的领域，因为不同的化学形式的硒似乎有不同的毒性鸡蛋。然而，当来自野生种群的卵含有≥1-ppm硒的湿重基础上，生殖损害可能是可能的，并应在该人群中进行评估。当鸡蛋中的硒含量达到5 ppm时，更有可能发生生殖障碍。
We fed mallards (Anas platyrhynchos) diets supplemented with 0-, 1-, 2-, 4-, 8-, or 16-ppm selenium in the form of selenomethionine. We fed another group of mallards a diet containing 16-ppm selenium as selenocystine. Females fed the control diet produced a mean of 8.1 ducklings that survived to 6 days of age, which was significantly greater than the 4.6 young produced by females fed 8-ppm selenium as selenomethionine and the zero surviving young of females fed 16-ppm selenium as selenomethionine. Selenocystine did not impair reproduction. Diets containing 8- and 16-ppm selenium as selenomethionine caused malformations in 6.8 and 67.9%, respectively, of unhatched eggs compared with 0.6% for controls. The most common malformations were of eyes, bill, legs, and feet. Selenium did not affect the onset or frequency of egg laying, egg size, shell thickness, fertility of eggs, or sex ratio of ducklings. Reduced survival and growth occurred in ducklings hatched from groups whose parents had received 8- or 16-ppm selenium as selenomethionine, even though all ducklings were fed a control diet. Concentrations of selenium in eggs and liver of adults could be predicted from dietary concentrations. We conclude that the dietary threshold of selenium as selenomethionine necessary to impair reproduction is between 4 and 8 ppm. It is difficult to identify 1 level of selenium in eggs that will be diagnostic of reproductive impairment in the field because different chemical forms of selenium appear to have different toxicities in eggs. However, when eggs from a wild population contain .gtoreq. 1-ppm selenium on a wet-weight basis, reproductive impairment may be possible and should be evaluated in that population. At 5-ppm selenium in eggs, reproductive impairment is much more likely to occur.