求翻译：我国蛋鸡业规模饲养庞大，占世界蛋鸡总量的40%多，现在蛋鸡业生产，首先追求的是较高的产蛋率及较好的环境适应能力，这就需要有经过遗传改进而具有高产性能的家禽良种作为基础。近年来，随着蛋鸡业的快速发展，引起蛋鸡产蛋率下降的因素越来越多的凸显出来，要想提高蛋鸡的利益需要了解各方面的知识是什么意思？

Keeping a large scale of China's egg industry, accounting for more than 40% of the total world hens, now egg industry production, first in pursuit of a higher rate of egg production and a better adaptation to the environment, which requires through genetic improvement poultry seed with high yield pe

My egg chicken, large scale livestock industry of the world's egg chicken more than 40% of the total chicken eggs, it is now, the first production of the quest for a higher rate of eggs and a better adaptation to the environment, this would need to have a genetic improvement and performance with a h

Our country layer industry scale raising is huge, accounts for the world layer total quantity more than 40%, now the layer industry production, first pursues is high produces the egg rate and good environment adaptiveness, this needs to have the process to inherit the improvement to have the high pr

Size of layer industry in China raising huge, more than 40% per cent of the world total of laying hens, now laying hen production, is the first to pursue a higher egg production rate and a better ability to adapt to circumstances, it needs through genetic improvement and performance of high-yield va