China is one of the most prolific countries for dinosaur material in the world, from skeletons to footprints and eggs. At present, China has documented more than 160 kinds of dinosaur, 35 genera and 39 ichnospecies of...China is one of the most prolific countries for dinosaur material in the world, from skeletons to footprints and eggs. At present, China has documented more than 160 kinds of dinosaur, 35 genera and 39 ichnospecies of dinosaur footprints, and 17 genera and 44 oospecies of dinosaur eggs. The dinosaur eggs in China are mainly distributed in Xinjiang, Inner Mongolia, Ningxia, Gansu, Henan, Hunan, Hubei, Jilin, Liaoning, Shandong, Zhejiang, Jiangxi and Guangdong （Fig. 1）, especially in Xixia of Henan, Nanxiong of Guangdong and Yunxian County of Hubei, which have the widest distribution, the best preservation and the most diversity.展开更多
Birds＇ selection on increase of egg＇s mass resulted in changes in the ratio of egg components. In this regard, now selection on improvement of eggs＇ quali- ty became one of the most important directions of selectio...Birds＇ selection on increase of egg＇s mass resulted in changes in the ratio of egg components. In this regard, now selection on improvement of eggs＇ quali- ty became one of the most important directions of selection work. In this work, the interrelation among various qualitative characteristics of eggs of Shanxing egg ducks breed, their variability and an individual assessment of ducks-mothers was considered. Prospects of carrying out selection on increase of yolk ratio in egg were estimated.展开更多
文摘China is one of the most prolific countries for dinosaur material in the world, from skeletons to footprints and eggs. At present, China has documented more than 160 kinds of dinosaur, 35 genera and 39 ichnospecies of dinosaur footprints, and 17 genera and 44 oospecies of dinosaur eggs. The dinosaur eggs in China are mainly distributed in Xinjiang, Inner Mongolia, Ningxia, Gansu, Henan, Hunan, Hubei, Jilin, Liaoning, Shandong, Zhejiang, Jiangxi and Guangdong （Fig. 1）, especially in Xixia of Henan, Nanxiong of Guangdong and Yunxian County of Hubei, which have the widest distribution, the best preservation and the most diversity.
基金Supported by the Earmarked Fund for National Waterfowl-industry Technology Research System(CARS-43-2)National Supporting Projects for Science and Techniques(2012BAD12B10)Special Project for International Science and Technology Cooperation(2013DFA31880)
文摘Birds＇ selection on increase of egg＇s mass resulted in changes in the ratio of egg components. In this regard, now selection on improvement of eggs＇ quali- ty became one of the most important directions of selection work. In this work, the interrelation among various qualitative characteristics of eggs of Shanxing egg ducks breed, their variability and an individual assessment of ducks-mothers was considered. Prospects of carrying out selection on increase of yolk ratio in egg were estimated.
