Preliminary evaluation of the effect of juvenile hormone III and methyl farnesoate on spermatophore quality of the white shrimp, Litopenaeus vannamei Boone, 1931 ( Decapodai : Penaeidae )
Fecha
2008-04
Autores
Alfaro-Montoya, Jorge
Zúñiga-Calero, Gerardo
García Rojas, Andrea
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Resumen
Este estudio preliminar es un primer paso en la exploración del efecto de la hormona juvenil III (HJ III) y el
metil farnesoato (MF) sobre la calidad de espermatóforos de Litopenaeus vannamei. La HJ III aplicada cinco veces a una dosis de 109 ng g-1 de peso corporal (p.c.) durante 58 días, no mejoró el conteo de espermatozoides en comparación con el grupo control (P>0,05). La anormalidad de espermatozoides
disminuyó en las regeneraciones sucesivas de espermatóforos de manera similar en machos tratados con HJ y machos control (P>0,05). Por el contrario, un total de cinco aplicaciones semanales de MF a 120 ng g-1 p.c. causó un incremento significativo en número de espermatozoides y una disminución
en anormalidad de espermatozoides (P<0,05). Una dosis mayor de MF (1200 ng g-1 p.c.) no causó un efecto significativo sobre la calidad de los espermatóforos (P>0,05).
This preliminary study is a first step in the exploration of the effect of juvenile hormone III (HJ III) and the methyl farnesoate (MF) on the quality of spermatophores of Litopenaeus vannamei. HJ III applied five times to a dose of 109 ng g-1 of body weight (b.w) for 58 days, no improved sperm count compared to control group (P> 0.05). Sperm abnormality decreased in successive spermatophore regenerations similarly in HJ-treated males and control males (P> 0.05). In contrast, a total of five applications weekly MF at 120 ng g-1 p.c. caused an increase significant in sperm number and a decrease in sperm abnormality (P <0.05). A higher dose of MF (1200 ng g-1 p.c.) did not cause a significant effect on the quality of the spermatophores (P> 0.05).
This preliminary study is a first step in the exploration of the effect of juvenile hormone III (HJ III) and the methyl farnesoate (MF) on the quality of spermatophores of Litopenaeus vannamei. HJ III applied five times to a dose of 109 ng g-1 of body weight (b.w) for 58 days, no improved sperm count compared to control group (P> 0.05). Sperm abnormality decreased in successive spermatophore regenerations similarly in HJ-treated males and control males (P> 0.05). In contrast, a total of five applications weekly MF at 120 ng g-1 p.c. caused an increase significant in sperm number and a decrease in sperm abnormality (P <0.05). A higher dose of MF (1200 ng g-1 p.c.) did not cause a significant effect on the quality of the spermatophores (P> 0.05).
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CAMARÓN DE MAR, HORMONAS, REPRODUCCIÓN ANIMAL, DECAPODA, PENAEIDAE, METIL FARNESOATE, SHRIMP, ANIMAL REPRODUCTION