The chick embryo proper comes from a very small region resting on the yolk.
小鸡胚胎本身来自于蛋黄上的一个非常小的区域。
During early proembryo stage, the dorsiventrality appears in the proper of the embryo. On the ventral side, the cells are small with dense cytoplasm and few vacuoles.
原胚初期胚体出现背腹极性，腹面的细胞小，细胞质稠密，液泡较少；
Recent attempts to improve the recipients' pregnancy rates via the improvement of embryo quality and the proper selection and management of recipients were discussed in this review.
胚胎的质量和受体牛的质量是影响胚胎移植受体牛妊娠率的两个非人为因素。
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