Follicular fluid is the liquid fraction that surrounds the oocyte during its growth and maturation in the ovary. The components of the follicular fluid can favor the functionality of the sperm. In the present research, the binding to the zona pellucida of epididymal spermatozoa of alpaca incubated with follicular fluid was studied. In the experiment a control group and a treatment group were used. The sperm from the control group and the treatment were incubated with zona pellucidae. The incubation of the treatment group was performed in the presence of follicular fluid at a concentration of 30%; while the incubation of the control group occurred in the absence of follicular fluid. It was observed that a greater number of spermatozoa joined the zona pellucida in the group incubated in the presence of follicular fluid. It was found that there were statistical differences between treatment and control. It is concluded that alpaca follicular fluid enhances the in vitro binding of spermatozoa to the zona pellucida of this species.Keywords: Alpaca, follicular fluid, zona pellucida, epididymal sperm, gametic interaction. RESUMENEl fluido folicular es la fracción líquida que rodea al ovocito durante su crecimiento y maduración en el ovario. Los componentes del fluido folicular pueden favorecer la funcionalidad de los espermatozoides. En el presente trabajo se ha estudiado la unión a zona pelúcida de espermatozoides epididimarios de alpaca incubados con fluido folicular de esta especie. En el experimento se utilizó un grupo control y un grupo tratamiento. Los espermatozoides del grupo control y el tratamiento fueron incubados con zonas pelúcidas. La incubación del grupo tratamiento se realizó en presencia de fluido folicular a una concentración de 30%; mientras que la incubación del grupo control se dio en ausencia de fluido folicular. Se observó que un mayor número de espermatozoides se unían a la zona pelúcida en el grupo incubado en presencia de fluido folicular. Se encontró que había diferencias estadísticas entre el tratamiento y el control. Se concluye que el fluido folicular de alpaca favorece la unión in vitro de espermatozoides a la zona pelúcida de esta especie.Palabras clave: Alpaca, fluido folicular, zona pelúcida, espermatozoides epididimarios, interacción gamética.
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