Tesis de maestría
La inexperiencia sexual de los machos tratados con días largos no disminuye la respuesta sexual de las cabras anovulatorias sometidas al efecto macho
Autor
Flores Medina, Elizabeth
Resumen
"El presente estudio se realizó con la finalidad de determinar si los machos sin
experiencia sexual inducidos a un intenso comportamiento sexual son capaces
de estimular la actividad reproductiva de las cabras anovulatorias sometidas al
efecto macho. Cinco machos cabríos con experiencia sexual y cinco machos sin
experiencia sexual, se sometieron a 2.5 meses de días largos para estimular su
comportamiento sexual durante el periodo de reposo. Un grupo de hembras
multíparas (n=50) se expuso a 5 machos sin experiencia sexual y el otro grupo
(n=50) se expuso a 5 machos con experiencia sexual. El comportamiento sexual (olfateos anogenitales, aproximaciones, flehmen, intentos de monta,
montas con penetración, montas sin penetración y automarcajes) en los
machos se registró durante 1 h los primeros 3 días de contacto con las
hembras. El porcentaje de hembras que ovularon, la tasa ovulatoria y la tasa de
gestación se determinó mediante ultrasonografía. Los machos con experiencia
sexual realizaron más olfateos anogenitales, aproximaciones laterales, montas
sin penetración y automarcajes que los machos sin experiencia sexual
(P<0.001). Los intentos de monta (P=0.155), las montas con penetración
(P=0.274) y los flehmen (P=0.544) no difirió en ambos grupos de machos. El
porcentaje de hembras que ovularon, la tasa ovulatoria y la tasa de gestación
no difirió entre las hembras expuestas a los machos con experiencia sexual y
sin experiencia sexual (P=1.0; P=0.154; P=1.0, respectivamente). Estos
resultados demuestran que los machos sin experiencia sexual, sexualmente
activos al ser sometidos a días largos, estimulan la actividad reproductiva de las
cabras anovulatorias en la misma medida que los machos con experiencia
sexual." "This study was conducted to determine whether sexually inexperienced male
goats rendered sexually active by photoperiodic treatment stimulate the
reproductive activity of anestrous female goats subjected to the male effect. Five
male goats sexually experienced and five male goats inexperienced, were
submitted to 2.5 months of artificial long days to stimulate their sexual activity
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during the non-breeding season. One group of multiparous females (n=50) was
exposed to sexually inexperienced males and another group (n=50) was
exposed to sexually experienced males. The sexual behavior of males (anogenital
sniffing, nudging, flehmen, mounting attempts, mounting with
penetration, mounting without it and self-urination) was registered by 1 h during
the first 3 days of contact with does. The female goats that ovulated, the
ovulatory rates and the pregnancy rate were detected by ultrasonography. The
sexual behaviors of the sexually experienced males was greater (ano-genital
sniffing, nudging, mount without penetration and self-urination; P<0.001) than in
those inexperienced males. The mount attempts (P=0.155), mount with
penetration (P=0.274) and flehmen (P=0.544) were not different between both
groups. The percentage of females that ovulate, the ovulatory rate and
pregnancy rate, did not differ significantly (P=1.0; P=0.154; P=1.0, respectively)
between those interacting with sexually experienced and inexperienced males.
This results show that sexually active inexperienced males subjected to long
days stimulate the reproductive activity of anestrous goats exposed to the male
effect in similar way that the sexually experienced males."