RESUMEN
Qualitative parameters of piapara semen (Leporinus elongatus) were evaluated before and after hormonal induction with carp pituitary extract at 2.5 mg.kg(-1) of live weight. The progressive motility, the spermatic vigor and the lifetime of the spermatozoa were higher before the hormonal induction (P > 0.05). The percentage of normal spermatozoa and spermatozoa with secondary pathologies did not differ (P > 0.05) between treatments: before induction (44.0 and 44.4%, respectively) and after-induction (44.3 and 46.7%, respectively). However, the percentage of primary pathologies was higher (P < 0.05) for the semen collected before induction than for the semen collected after induction; the estimates were 12.2 and 8.0%, respectively. The most frequent pathologies were the taillessness with the frequencies of 27.4 and 36.3% followed by the headlessness for which the estimates were 10.1 and 3.9%, before and after induction respectively. The semen collected before the hormonal induction presented better qualitative parameters.
Asunto(s)
Peces/fisiología , Semen/fisiología , Motilidad Espermática/fisiología , Espermatozoides/fisiología , Animales , Carpas , Peces/clasificación , Masculino , Hormonas Hipofisarias/farmacología , Semen/efectos de los fármacos , Motilidad Espermática/efectos de los fármacos , Espermatozoides/anomalíasRESUMEN
Qualitative parameters of piapara semen (Leporinus elongatus) were evaluated before and after hormonal induction with carp pituitary extract at 2.5 mg.kg-1 of live weight. The progressive motility, the spermatic vigor and the lifetime of the spermatozoa were higher before the hormonal induction (P > 0.05). The percentage of normal spermatozoa and spermatozoa with secondary pathologies did not differ (P > 0.05) between treatments: before induction (44.0 and 44.4 percent, respectively) and after-induction (44.3 and 46.7 percent, respectively). However, the percentage of primary pathologies was higher (P < 0.05) for the semen collected before induction than for the semen collected after induction; the estimates were 12.2 and 8.0 percent, respectively. The most frequent pathologies were the taillessness with the frequencies of 27.4 and 36.3 percent followed by the headlessness for which the estimates were 10.1 and 3.9 percent, before and after induction respectively. The semen collected before the hormonal induction presented better qualitative parameters.
Os parâmetros qualitativos do sêmen de piaparas (Leporinus elongatus) foram avaliados antes e após a indução hormonal com o extrato de hipófise de carpa na dosagem 2,5 mg.kg-1 de peso vivo. A motilidade progressiva, o vigor espermático e o tempo de vida dos espermatozóides apresentaram valores superiores (P < 0,05) no sêmen coletado antes da indução hormonal. Já a estimativa da porcentagem de espermatozóides normais ou com patologias leves, na pré-indução (44,0 e 44,4 por cento, respectivamente) e na pós-indução hormonal (44,3 e 46,7 por cento, respectivamente) não diferiram (P > 0,05) entre os tratamentos. Porém a estimativa de patologias graves foi maior (P < 0,05) no sêmen de pré-indução do que no pós-induzido com 12,2 e 8 por cento, respectivamente. A patologia mais freqüente foi cabeça solta com 27,4 e 36,3 por cento seguida por cauda solta com 10,1 e 3,9 por cento, antes e após a indução hormonal respectivamente. De acordo com os resultados, o sêmen de piapara coletado na pré-indução hormonal apresentou os melhores parâmetros qualitativos.