Incubation and conservation: effect on sperm motility of swine semen
Keywords:
Boar, Thermic shock, Sperm, EjaculateAbstract
Aiming to increase the spermatic resistance to lowering of temperature, ejaculates from three boars collected through the technique of the glove hand were used. After collection, an aliquot of semen was diluted in the BTS and distributed, in equal parts, in 5 treatments that differed in terms of temperatures (37 and 25 °C) and balance period (6 and 24 hours) before conservation at 17 °C for 7 days. The treatments were: T1: semen not subjected to any time or equilibrium temperature; T2 and T3: semen incubated at 37 °C for 6 and 24 hours, respectively; T4 and T5: to semen incubated at 25 °C for 6 and 24 hours, respectively. The semen was evaluated on days D1 to D4 and on D7 for vigor and sperm motility at five minutes, and two hours after rewarming at 37 °C. The semen incubated at 37 °C/24 hours presented values of vigor and motility much lower than those of the other treatments (p<0.05, while the semen submitted to the equilibrium temperature of 25 °C for 6 hours prior to dilution stood out by conserving sperm motility after 2 hours of incubation at 37 °C (p<0.05). In conclusion, the different temperatures and times of equilibrium used influenced the semen conservation, in which a higher pre-dilution incubation temperature (37 °C) for a prolonged period (24 hours) reduced the sperm resistance to a lowering of temperature, while the combination 25 °C/6 hours favored the maintenance of sperm motility in a thermoresistance test.
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