The Application Effect of eCG in the Selection Rate and Pregnancy in Embryos Recipients

Abstract

The pregnancy rate for embryos recipients is one of the most important points in embryo transfer and IVF (in vitro fertilization). For this experiment it was conducted in Cesumar’s ranch, from January to May 2006, being used 360 crossover breeds as Simmental X Nellore and Abeerdin, Angus X Nellore, with 380 kg average weight. The animals were divided into three treatments with 120 individuals each, separated in Brachiaria paddocks in an open space, all suffering the same climate change and receiving water and mineral salt at home. The animals were synchronized, and in treatment number one received an intra vaginal device impregnated with progesterone (Cronipress-Biogenisis) and intramuscular application of 2,0 mg of estradiol benzoate (Estrogin®). Eight days after the devices were implanted the devices were removed and used 150 mg clorprostenol (Veteglan ®-Serono Pharmaceuticals Ltd.), and 24 hours later was applied 1,0 mg of estradiol benzoate. In the animals in treatment 2 and 3 were applied 400 IU ECG (Folligon-Intervet) in the D5 and/or D8 (with the withdrawal of the implant) respectively. There was no treatment effect (p>0,05) in pregnancy rate for the animals treatment of 1, 2 and 3, however the recovery rate of the receptor was higher in the animals that received ECG in D5 or D8, in comparison with control. Thus we can conclude that the application of ECG improves the utilization level of recipients for the in ovulation of embryo but it does not change the rate of pregnancy, regardless of the date of application.