Correlación genética de los caracteres productivos, reproductivos y corporales en bovinos de raza Guzerat importados a Ecuador entre 2017-2022

The objective was to estimate the genetic correlation and the productive, reproductive and body characteristics in Guzerat bulls offered by commercial semen companies in Ecuador during the period 2017 - 2022. The data were obtained from 23 bulls offered in catalogs of commercial semen houses of Guzerat breed, the transmission values were tabulated and descriptive statistics were obtained. Pearson's coefficient with a significance of 5% was used to establish the associativity of the variables and a linear regression for the trend of the parameters evaluated as a function of the year of birth of the bulls. Results showed negative correlations between PTA Milk and weights (r=-0.52 to-0.44, p<0.01 to <0.04), and positive correlations between PTA Fat and weights (r=0.67 to 0.80, p<0.0006 to <0.0001). Weaning weight is positively related to later weights and maternal weight (r=0.67 to 0.93, p<0.0004 to <0.0001). Age at first calving shows negative correlation with stability (r=-0.59, p<0.003) and positive correlation with scrotal circumference (r=0.79, p<0.0001). Body structure is positively related to PTA fat and weights (r=0.48 to 0.72, p=0.04 to <0.0003), and muscularity shows negative correlations with PTA fat and weights (r=-0.52 to -0.8, p=0.02 to <0.0001), and with age at first calving (r=-0.65, p<0.002). Scrotal perimeters were positively associated with body structure (r=0.49 to 0.65, p<0.03 to <0.0019) and negatively associated with muscularity (r=-0.52 to -0.55, p<0.02 to <0.01). Genetic trends were not significant (p>0.05) and did not show favorable annual gains.

• Main Author: Domínguez Zambrano, Kerly Milena (author)
• Other Authors: Ludeña Silva, Giomara Brigitte (author)
• Format: bachelorThesis
• Language: spa
• Published: 2024
• Subjects: Progenie; Homogeneidad genómica; Producción bovina; Estabilidad productiva
• Online Access: http://repositorio.espam.edu.ec/handle/42000/2456