Sincronización del ciclo estral y tasa de preñez en novillas Holstein
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Instituto Colombiano Agropecuario
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Un experimento sobre sincronización del ciclo estral se llevó a cabo en el Centro Nacional de Investigaciones agropecuarias, Tibaitatá, Colombia. En un diseño completamente al azar, con cuatro repeticiones por tratamiento y un grupo testigo, se probaron cinco formas de sincronización, una quirúrgica manual y cuatro de tipo hormonal. Los tratamientos fueron efectivos en su totalidad (95%). La sincronización ocurrió entre 48 y 128 horas de iniciado cada tratamiento, encontrándose diferencia estadística altamente significativa entre el grupo testigo y los tratamientos. La preñez al primer servicio en el grupo sincronizado fue del 70%, con variación del 50 al 100%. Los índices económicos señalan que el costo más alto por tratamiento correspondió al análogo intramuscular (149) y el más barato a la extirpación manual del cuerpo lúteo (90). Respecto a costos por preñez, el más eficiente fue la prostaglandina natural intramuscular (55) y el menos eficiente, el análogo intrauterino (116).
An experiment about synchronization of estrus in dairy heifers was carried out at the National Agricultural Research Station "Tibaitatâ", Colombia. In a completely random experimental design, with four replications for treatment and a control group, five different forms of synchronization were tested: one manual surgery and four of hormonal type. The synchronization treatments were almost completely effective (95%). The synchronization treatments took place from 48 to 128 hours after application of treatments; with a higly significant-statistical difference between the control group and the treatments. The pregnancy at the first service of the synchronized group was 70%, with variation of 50-100%. The economical indexes showed that the highest cost by treatment was the intramuscular analogous (149), and the lowest cost was the manual extirpation of corpus luteum (90). In relation to economical reproductive efficiency, the most efficient was the use of intramuscular natural prostaglandin (55), and the least was the analogous introcervix application (116).
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An experiment about synchronization of estrus in dairy heifers was carried out at the National Agricultural Research Station "Tibaitatâ", Colombia. In a completely random experimental design, with four replications for treatment and a control group, five different forms of synchronization were tested: one manual surgery and four of hormonal type. The synchronization treatments were almost completely effective (95%). The synchronization treatments took place from 48 to 128 hours after application of treatments; with a higly significant-statistical difference between the control group and the treatments. The pregnancy at the first service of the synchronized group was 70%, with variation of 50-100%. The economical indexes showed that the highest cost by treatment was the intramuscular analogous (149), and the lowest cost was the manual extirpation of corpus luteum (90). In relation to economical reproductive efficiency, the most efficient was the use of intramuscular natural prostaglandin (55), and the least was the analogous introcervix application (116).
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Ganadería doble propósito
Palabras clave
Fisiología animal reproducción - L53, Reproducción animal, Sincronización del celo, Prostaglandinas, Ciclo estral, Tasa de natalidad, Ganado bovino, Ganadería y especies menores