Observation of Conception rate of Artificial Insemination of Straw Frozen Semen from Dorser Mutton Sheep;

The results of using LRH-A_3 to induce estrus in anestrus gilts indicated that LRH-A_3 could promote estrus in anestrus gilts and shorten the days open of first-litter sow, improve estrus rate and conception rate of anestrus gilts,and increase litter size.

The results showed that the total conception rate was 58.

Experiment of improving embryo transfer pregnancy rate of goat by using endoscope;

With the technique of determining ovulation in cow ovary by rectal examination, learning proper insemination time and stiff sterilization, the pregnancy rates of the cattle and buffalo were raised from 20% and 40% to 40% and 60%, respectively, in 2003 in Zhongshan County.

The results show that the pregnancy rate of the five and eight times dilution group in rut period were 91.

Pregnant rate is affected by the different environment of the embryo before and after transfer.

The clinical reactions of the disease and goats have a poor constitution leading by the disease, and the stress reactions caused by injecting of the vaccine could affected the pregnant rates of the female goats.