The analysis of testosterone concentration (ng/dL) were performed with commercial kits and quantification of the hormone made by radioimmunoassay (RIA) totalizing eight replicates per bull, 2 per season, totalizing 80 samples. The experiment was conducted from September to August and made four harvests in each of the four seasons. Sixteen semen samples by automatic electroejaculation were carried out in each of 10 bulls, totaling 160 samples. Five Nellore and five Simmental bulls with 48-72 months old, extensively managed were evaluated for sexual soundness using physical and morphological characteristics of semen and testosterone serum levels. Materials, Methods & Results: The city of Presidente Prudente-SP-Brazil, where the experiment was realize, presents latitude 21☂9`50``S, longitude 49☁4`2``W and altitude of 475 meters. The objective of this study was to evaluate the seasons influence (spring, summer, autumn and winter) on semen characteristics and testosterone levels in Nellore and Simmental bulls raised on field.
The semen quality may be significantly affected by environment, by fluctuations in temperature, humidity and photoperiod.
Abstract: Background: In Brazil, a higher percentage of abnormal sperm after high temperature and relative humidity observed a higher semen volume in the rainy.
0 kommentar(er)
