绿头鸭

一只小绿头鸭正缓慢但坚定地挣扎着来到这个世界上。

Slowly but surely one little mallard was struggling to make its way to the world .

系统发育分析结果显示，朱鹮与绿头鸭的亲缘关系较近，而与鸡和鹌鹑的亲缘关系较远。

Phylogenetic analysis indicated crested ibis was cluster to mallard and far from quail . 4 .

绿头鸭mtDNA限制性内切酶酶切分析

Restriction Analysis on mtDNA from Anas platyrhynchos

与Genebank中报道的番鸭IL-2基因序列有100%的同源性，与绿头鸭IL-2基因序列进行比较，在ORF内有7个碱基不同，但其推导编码的氨基酸二级结构完全相同。

Comparing with the sequences of Anas platyrhynchos reported in gene bank , there are mutation nucleotides of seven , but the predicted second structure of encoding amino acid is similar .

结果两鸭场绿头鸭的DHBV自然携带率为360%（187/519），其95%可信限为310%～440%。

Results The average natural carrying rate of DHBV is 36.0 % ( 187 / 519 ) from two farms . 95 % confidence interval of the tested blood sample is within the range of 31.0 % - 44.0 % .

不同月龄绿头鸭血液生化参数比较

Comparison of blood chemical parameters in Anas platyrhynchos of different month old

欧亚大陆和非洲北部的淡水鸭，与绿头鸭和短颈野鸭有亲缘关系。

Freshwater duck of Eurasia and North Africa related to mallards and teals .

非家养的鸭，特指绿头鸭。种番鸭网上平养和网上地面混合平养饲养效果研究

The research of feeding effect about online-Ping Yang and ground-line mixed-Ping Yang of kinds of muscovy duck

这是已知最早的实证，种系论已经追踪到今天的绿头鸭。

This is the earliest known existence , and the genealogy has been traced to the present-day mallard .

等等。当然，她也教导我们关于可爱的大白鹅、绿头鸭、松鼠

Of course , she also teaches us about the lovable big white geese , the mallard duck , the squirrel

清水湾是闻名国际的花脸鸭渡冬地，除此之外，还有数十万只的豆雁、白额雁、绿头鸭等在这儿渡过漫长的冬天。

Cheonsuman is an important wintering place for Baikal Teal . Besides , there are also hundred thousands of Bean Goose , White-fronted Goose , Mallard etc to spend their winter there .

绿头野鸭与北京鸭杂交亲合过程的观察

Observation of affinity in the course of cross breeding between Mallard and Beijing duck