The objective of the work was evaluate the effect of the feedingwith different rude protein levels under the sexual maturity and quality of semen of boars. The swines were fed with diets contend 12%, 16% and 20% of rude protein. Were used 11 animals of commercial ancestries. For evaluation of the sexual behavior and adaptation of the piglets, from 151 days of age the animals were placed in contact with the dummy for semen harvest one time per week, per 15 minutes. Evaluated concentration (millions/mL), total motility (TM), progressive motility (MP), vigor (v) and morphologic alterations (AM). The animals fed with diets contend 16% of PB presented better resulted of male behavior. The average results of the parameters: jumps on the dummy, number of mount, exposition of penis, TM, MP, V and spermatic concentration, not differed between the treatments 5% from significance. The values of AM found in this study differed statistical between itself. The parameter sexual maturity presented significant difference between the swines that received diets contend 20% and the animals that received diets with 12% and 16% from PB. The castrated male swines of T16% not presented male behavior better. Not have difference in the quality of the semen of boars feeding with different rude protein levels (12%, 16% and 20%) since weans until reaching the sexual maturity. The animals that received diets with 20% from PB reached the sexual maturity more precociously.
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