Evaluación del método de transferencia embrionaria en novillas y vacas receptoras en una hacienda de producción bovina

Abstract

Being the transfer of embryos one of the most used reproductive methods and one of the most beneficial tools in the world, has allowed to increase the genetic improvement of the milk and meat cattle, since the advantages offered by this program are Important to increase production in upper genetically females. This research work was carried out in the province of Santo Domingo of the Tsachilas in the Hacienda San Antonio, located in vía Quevedo Km. 381/2 S/n left margin. The objective was to evaluate the gestational viability of the transfer of embryos in heifers and receiving cows, working with 79 cows and 190 heifers that were performed the respective heat synchronization using the following hormonal protocol; On Day 0, 2ml of Sincrodiol (Estradiol benzoate) plus intravaginal slow-release progesterone (Sincrogest) was applied, at day 5, 2ml of Sincrocio (prostaglandin) plus 2ml of synchronized ECG (Equine chorionic Gonadotrophin) was applied, At day 8 The intravaginal implant was removed and 1ml of synchro CP (estradiol cypionate) was applied, on day 16 the respective ovarian evaluation was performed using ultrasonography in order to identify the presence and size of the luteum body in the ovaries for , if the female is suitable, it is proceeded on the 17th, to the respective transfer of embryos (TE); This was worked with 64 cows and 164 heifers that reacted to the hormonal protocol. At day 40 the diagnosis of gestation was carried out with ultrasonography and at 90 days gestation was confirmed by rectal palpation in both heifers and cows. The information obtained was organized and tabulated in Microsoft Excel sheets from the different variables studied. For the processing of the data, the statistical program SPSS version 22 test for Windows was used and a reliability of 95%, that is, a level of significance of 5%. The results are shown in bar charts, which allow a better understanding of the information collected. The results show that the right ovary has better functionality in cows with 49.4% and heifers 43.3%, compared to the left ovary in cows 29.1% and heifers 35.3%. Considering the number of lutea bodies presented each bovine female was obtained as a result better percentages of pregnancy that occurred with a single body luteum (61.3%) and comparison of two to five CL, which their percentages were low. Considering the number of lutea bodies presented each bovine female was obtained as a result better percentages of pregnancy that occurred with a single body luteum (61.3%) and comparison of two to five CL, which their percentages were low. In the diagnosis of gestation by ultrasonography at 40 days it was obtained that heifers present a better gestation (47.0%) compared to cows with a (42.2%), in the confirmation of pregnancy at 90 days in heifers was obtained one (42.1%) and cows one (37.5%). It is concluded that in heifers are obtained better results of gestation.