Comparison of the hatchability,egg parameters,and the physiological indices of embryo and chick blood between Esa brown chicken,an induced breed,and Lhasa white chiken,a local breed from Lhasa,was conducted.

The present experiment was conducted to determine the changes of hepatic and renal metallothionein mRNAs expression in response to different levels of zinc supplementation in ISA laying hens.

Primary study on relationship between bone mass and RFLPs of the insulin-like growth factor-Ⅰgene in ISA layers;

Comparison of total benefit between white shell and brown shell layers;