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                <title xml:lang="en">Two sexually active bucks housed with four successive groups of anovulatory does induced high pregnancy rates during seven-day mating period</title>
                <title xml:lang="es">Dos machos cabríos sexualmente activos alojados con cuatro grupos sucesivos de hembras anovulatorias indujeron altas tasas de preñez durante periodos de empadre de siete días</title>
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                <term xml:lang="en">subtropics</term>
                <term xml:lang="en">sexual behavior</term>
                <term xml:lang="en">male-female ratio</term>
                <term xml:lang="en">male effect</term>
                <term xml:lang="en">light treatment</term>
                <term xml:lang="en">hormonal treatment</term>
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              <p>Background. In seasonally anovulatory goats, sexually active bucks led a high pregnancy rate during a mating period of 36 days. Progesterone priming of does can reduce the length of the mating period while maintaining high fertility by allowing oestrous behaviour at the first male-induced ovulation. Objective. To determine whether high fertilization rates could be achieved by using two sexually active bucks, alternated daily for a period of seven days in four successive groups of does. Methodology. Two control bucks were used only with one group of does (n = 19), whereas two experimental bucks were successively housed with four groups of does (n = 18 or 19 each). One of the control and experimental bucks was introduced to their respective groups in the morning and removed 24 h later to rest for 24 h. Immediately after the removal of the first buck, the second buck was placed with the group of does. Each doe was treated with 25 mg of progesterone im 48 h prior to the first introduction of bucks to reduce short ovulatory cycles. Results. In each group, the proportion of does that ovulated was higher than 93%. These proportions did not differ among groups exposed to the control or experimental bucks (P &gt; 0.05). In each group, the proportion of pregnant does was higher than 78%; proportions did not differ among groups (P &gt; 0.05). Implications. At farms with few bucks, efficient management of sexually active bucks can yield a high percentage of pregnant females. Conclusion. These results indicate that two sexually active bucks housed with four successive groups of progesterone-treated anovulatory does during a mating period of seven days were able to achieve high pregnancy rates.</p>
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              <p>En cabras en anovulación estacional, los machos cabríos sexualmente activos permiten obtener altas tasas de preñez en un período de apareamiento de 36 días. El tratamiento de las hembras con progesterona antes de ponerlas en contacto con los machos reduce la duración del período de apareamiento sin modificar la fertilidad al permitir el comportamiento estral en la primera ovulación inducida por el macho. Objetivo. Determinar si se pueden lograr altas tasas de preñezs utilizando dos machos cabríos sexualmente activos, alternados diariamente durante un período de siete días en cuatro grupos sucesivos de hembras. Metodología. Se usaron dos machos testigo que se introdujeron solamente con un grupo de hembras (n = 19), mientras que dos machos experimentales se introdujeron sucesivamente con cuatro grupos de hembras (n = 18 o 19 cada uno). Uno macho testigo y otro experimental se introdujeron a sus respectivos grupos en la mañana y se retiraron 24 h después para descansar por 24 h. Inmediatamente después de sacar el primer macho, el segundo macho se introdujo con el grupo de hembras. Cada hembra fue tratada con 25 mg de progesterona im 48 h antes de la primera introducción de los machos para reducir los ciclos ovulatorios de corta duración. Resultados. En cada grupo, la proporción de hembras que ovuló fue superior al 93% y no hubo diferencias entre los grupos expuestos a los machos testigo o experimentales (P &gt; 0.05). En cada grupo, la proporción de hembras preñadas fue superior al 78% y no hubo diferencias entre los grupos expuestos a los machos testigo o experimentales (P &gt; 0.05). Implicaciones. En hatos con pocos machos, el manejo eficiente de los machos sexualmente activos puede permitir obtener altos porcentajes de cabras preñadas. Conclusión. Estos resultados indican que dos machos sexualmente activos puestos en contacto con cuatro grupos sucesivos de hembras anovulatorias tratadas con progesterona durante un período de apareamiento de siete días pudieron lograr altas tasas de preñez.</p>
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