受体牛不同处理方法同期发情与冷冻胚胎移植效果研究

Study on the Efficiency of Transplantation of Frozen Embryos by Different Treatment Method of Receptor Cattle

摘要：选择本地黄牛及其杂交牛为受体，在集中补饲添加维生素和微量元素的混合精料50～60d后，分别采用一次注射PG、二次注射PG、CIDR＋PG、CIDR＋PG＋VE4种方法进行同期发情处理，并设自然发情组作移植效果比较。结果4种同期发情处理后的发情率分别为：70．00％、85．71％、88．579／6、86．709／6，一次注射PG法的同期发情率明显（P＜0．01）低于其它3种处理方法；二次注射PG、CIDR＋PG、CIDR＋PG＋VE及自然发情组的移植受胎率分别为；51．85％、52．00％、47．06％和47．34％，这几组间差异不显著（P＞0．05），但它们的移植受胎率均明显（P＜O．01）高于受胎率为38．899／6的一次注射PG组。

Receptor cow selected from local yellow cattle and crossbred cattle were treated in four groups with different synchronized estrus disposal which were one--time PG, two--times PG, CIDR＋PG and CIDR＋PG ＋WE, And natural estrous cattles were selected for control. The synchronization estrus rates were 70. 00%, 85.71%, 88.57% and 86.70%, respectively. The conception rates were 38.89%, 51.85% 52.00%, 47.06% and 47.34%. Both synchronization estrus rate and conception rate were significantly different between the one--time PG injected group and all other groups （P〈（0.01）. However, for all other groups, the synchronization estrus rate and conception rate were not statistically significant, respectively （P〉0.05）.