Desempeño productivo y reproductivo de la hibridación Dorper X Corriedale Mestiza, y Pelibuey X Corriedale Mestiza

Abstract

The hybridization Dorper × Corriedale Mestiza and Pelibuey × Corriedale Mestiza was evaluated in the parish of Jerusalén, Biblián-Azogues, as part of a genetic improvement program for local Andean sheep lines. Progeny performance was analyzed through productive parameters such as birth weight and body condition, as well as reproductive parameters in the dams, including pregnancy rate and mortality rate. A total of 50 Corriedale Mestiza ewes were inseminated using a 14-day synchronization protocol and a laparoscopic insemination technique. Pregnancy diagnosis was performed by ultrasonography at 35 days post-insemination, and lambs were evaluated during the first 72 hours postpartum. The results demonstrated the viability of these hybridizations through artificial insemination, where the heritability coefficient of the dams was a determining factor in the reproductive characteristics of the offspring. Mortality indices highlighted the importance of prior deworming before synchronization and vitamin supplementation, which contributed to positive outcomes and reduced mortality. It was concluded that selecting dams with higher body weight and good body condition improves the success of genetic improvement programs, while artificial insemination reduces inbreeding and enhances productive and reproductive traits. These findings demonstrate the feasibility of genetic improvement programs and their contribution to strengthening Andean sheep production systems as a key component of sustainable livestock development. Keywords: Progeny, hybridization, heritability, artificial insemination