Efectos de la infestación de garrapata Boophilus microplus, en la ganancia de peso y los parámetros reproductivos y fenotípicos de toros Brangus hasta los 19 meses

摘要: The objective of the experiment was to evaluate Brangus bulls, compared between resistant and susceptible animals tick infestation through determination average daily weight gain (GMD) age groups stablished levels infestation. bulls evaluated were divided by in three groups: “Group A” with ages 14 15 months, B” 16 17 months C” 18 19 months. group which selected based on parameters AgriContato LDTA Company, underwent an individual andrological examination. A level established for each these are defined as: (1), low (2) high (3); scrotal circumference measured bull groups. phenotypical classification made using Lamarca system evaluates values conformation (musculature, foreskin structure) such as racial characteristics (head, type color) 120 bulls. results correlated lab examination (motility, vigor ejaculation volume) 69 showed significant differences GMD gained during a year since weaning inverse correlation variable age. correlations positive comparison relation