Efecto de la progesterona aplicada en dos momentos del metaestro sobre el tamaño del embrión tamaño y función del cuerpo lúteo CL en ovejas

Abstract

The effect of exogenous progesterone was evaluated applied in two moments of early metaestrus on embryo size and size and function of the corpus luteum in 21 sheeps Corriedale breed in Irquís Farm of the University of Cuenca in a block design was valued at random. The means were compared with Tukey test with significance level of 0.05. The treatments performed were: T1) Control; T2) application of P4 between 2 to 4 days after the service; T3) application of P4 between days 3 to 5 after the service. The study duration was 60 days. Increased serum levels of progesterone in blood evidence a significant difference (P˂0.05) between treatments with average values 8.20; 2.0; 13.6 ng/ml for T1, T2, T3 respectively treatments. There were no significant differences between treatments for the size and function of the corpus luteum. The results indicate that the application of P4 in the early stage of metaestrus not affect the size and function of the corpus luteum, but significantly increases the levels of P4 at that stage