Egg shell quality and calcium for layers how much, in what form, when to give?
蛋壳质量与供给产蛋鸡的钙：以何种形式、何时、供给多少？。The comparative trials were carried out in two henhouses with same poultry density, same ventilation and temperature controlling system.
选取尺寸、样式和饲养密度等完全相同的两栋蛋鸡舍作对比试验，两栋鸡舍通风采用自动控制装置。Effects of bacitracin and chlortetracycline on laying performance and egg quality and approach to its mechanism in aging hens .
杆菌肽锌和金霉素对蛋鸡产蛋性能和蛋品质的影响机理。My three Barbary hens and the black are the best layers in Champagne . And you come and tell me that there are no eggs !
我那三只巴巴里母鸡跟那只黑母鸡是全香槟省最好的下蛋鸡。你倒来跟我说没有鸡蛋！The results show that: 1. With the addition of rare earth-chitosan chelate increased, the rate of egg production raise gradually.
试验结果表明：1。随着壳糖胺镧铈螯合盐添加量的增加，蛋鸡的产蛋率逐渐提高。The world's population of laying hens is now nearly six billion strong, according to the United Nations's Food and Agriculture Organisation.
根据联合国粮农组织的报告，目前世界上蛋鸡的数量接近60亿只，几乎人均一只。The occurrence of Avian Leukosis Virus-J Subgroup on the Commercial layer of Roman reported was the first time at home and abroad.
商品代罗曼蛋鸡发生禽J-亚群白血病的报道在国内外尚属首次。Experiments showcase that the performance of laying hens varies with their ages, and the model is capable of fitting data accurately.
结果显示蛋鸡的各种性能随着其日龄而变化，且所提模型能够很好地逼近数据。Some farmers are the frequent occurrence of abnormal layers of egg drop could do nothing, causing great economic loss.
有的饲养者对于蛋鸡频繁发生的非正常性产蛋下降总是束手无策，造成很大的经济损失。