Consanguinidad en toros Gyr comercializados por catálogo en Ecuador entre 2017-2022

The study evaluated the inbreeding and parentage coefficient in Gyr bulls marketed in Ecuador between 2017 and 2022. Thirty-five bulls from a total of 607 animals were analyzed and the complete pedigree of 424 individuals was identified. Using PedigreeViewer, Endogv4.8 and InfoStat software, the pedigree tree was constructed and a linear regression analysis was performed to examine the relationship between inbreeding and breeding values. The average inbreeding coefficient was 1.08% (±3.29) and relationship 1.71% (±1.27), showing a slight increase over time. A moderate positive relationship was observed in milk production, with an increase of 8.66 kg associated with inbreeding. However, in other productive parameters, such as birth weight, a decrease was found with higher levels of inbreeding, while weaning weight showed a weak increase of 0.0801 kg. As for age at first calving, there was a positive correlation with inbreeding, with a coefficient of 0.0436 days. In terms of conformation, inbreeding had negative effects on scrotal circumference, body length, thoracic circumference and rump height, with a moderately negative relationship between inbreeding and rump height. The results highlight the importance of controlling inbreeding in the genetic selection of Gyr bulls, since it significantly affects their productive, reproductive and morphological performance. The information obtained provides a basis for improving breeding and selection practices for this breed in Ecuador.

• Váldodahkki: Lozano Gámez, Lia Sorangel (author)
• Materiálatiipa: bachelorThesis
• Giella: spa
• Almmustuhtton: 2024
• Fáttát: Parentesco; Bos indicus; Endogamia; Valor genético
• Liŋkkat: http://repositorio.espam.edu.ec/handle/42000/2451