Trabajos de Titulación - Medicina Veterinaria
URI permanente para esta colecciónhttps://dspace.ucacue.edu.ec/handle/ucacue/53
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Examinando Trabajos de Titulación - Medicina Veterinaria por Autor "Arce Prieto , Patricio Javier"
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Ítem Acceso Abierto Relación de la somatotropina recombinante bovina con la tasa de preñez de embriones ovinos vitrificados producidos in vivo.(Universidad Católica de Cuenca., 2021) Arce Prieto , Patricio Javier; Alvarado Alvarado, Juan Carlos; 0302025168Multi-ovulation and embryo transfer are reproductive biotechnologies intended to increase the number of offspring that a genetically superior female can have during her lifetime, and therefore have a beneficial effect on improving the productivity of sheep flocks. Somatotropin is a protein hormone produced by the anterior pituitary gland that stimulates body growth and has other functions, some of which are regulatory of reproductive function. This study was conducted to determine the relationship of recombinant bovine somatotropin (rbST) to the pregnancy rate of vitrified bovine embryos produced in vivo. The study was carried out in the Luis Cordero parish, Azogues Canton, Cañar Province, Ecuador. Ten Merino crossbred ewes were synchronized with medroxyprogesterone sponges (60 mg) for 14 days and injected with 400 IU of ECG on the day of sponge removal. On day 21 of the protocol (day 7 after estrus) embryos produced in vivo from Pelibuey ewes, treated or not with two doses of bovine recombinant TS (rbST), previously vitrified and warmed, were transferred. One embryo was deposited in the uterus of each recipient female and after 30 days gestation was diagnosed by ultrasound. Data were analyzed using the SAS chi-square test. It was determined that ewes transferred with embryos from rbST-treated donors had a higher pregnancy rate (50%), but not significant, than those that received embryos from females not treated with the hormone (30%). In conclusion, although the difference was not significant, probably due to the small number of ewes transferred in each group, ewes receiving rbST embryos achieved a pregnancy rate 20 percentage points higher than those receiving control embryos. Keywords: multi ovulation, somatotropin, embryo transfer, pregnancy rate, ewes
