Resumen de Rendimiento del moet aplicado al programa de selección de la rasa aragonesa de upra-grupo pastores
José Folch Pera, José Luis Alabart Álvarez, B. Lahoz Gallo, R. Mozo Martín, Jorge Hugo Calvo Lacosta, M. J. Cocero, Francisco Javier Quintín Casorrán, E. Sevilla Mur, Marta Hernández García, Josep Ramón i Riba, Clovis J. F. Oliviera Júnior, E. Echegoyen, P. Sanchez, Enrique Fantova Puyalto
In the selection scheme to improve prolificacy in the Rasa Aragonesa sheep breed, the males to be tested are produced by a MOET programme, using the ewes of higher genetic value as donors. In the period 1998-2013, a total of 331 flushings have been performed in 213 donor ewes. Ewes were treated with FGA sponges and superovulated with 8.8 mg of oFSH (Ovagen) in eight decreasing doses (2 x 1.32; 4 x 1.1 and 2 x 0.88 mg) at 12h intervals. Since 2008, Ovagen was replaced by Folltropin. Intrauterine insemination (200x106 spermatozoa/ewe) with fresh semen from selected rams was carried out 51h after sponge withdrawal. A total of 3076 embryos were obtained (2037 morphologically viable), 1551 of which were fresh-transferred to FGA+eCG synchronized recipients (two morulae or blastocysts per recipient). A total of 931 lambs were born (470 males), 226 of which were suitable to be tested. The efficiency of the MOET program has been influenced by many factors, such as the improvement of the techniques, the number of flushings per donor, the genetic value of the donor or the ovulation rate of the recipient. The importance of MOET in the selection scheme is discussed
