Avaliação in vitro do sêmen refrigerado e congelado de touros da raça 5/8 girolando

Abstract

The use of semen from 5/8 Girolando bulls is a way to turn aviable genetic material from a specialized breed in the harshest environments. In this sense, the objective of this study was to analyze in vitro the semen from this breed, concomitant to the comparison of semen changes the same sample subjected to cooling (24 and 48 hours) and freezing, the seminal analysis of bulls exposed to the same conditions and checking correlations between them and mainly obtain standard values for l in vitro seminal assays. Analyzes of total motility, progressive motility, curvilinear speed and beat cross frequency showed statistical difference between the cooling and freezing treatments, with the bull factor influencing the results of plasma membrane integrity, acrosome membrane potential and chromatin condensation. Among the variables, the integrity of the plasma membrane was the variable that presented the highest correlation with the other studied. The in vitro seminal analyzes of 5/8 Girolando bulls subjected to low temperatures will contribute to the knowledge of standard values for the analyzed variables.