التفاصيل البيبلوغرافية
| العنوان: |
Influencia del tipo de destete sobre el inicio de la pubertad de toritos de carne. (Spanish) |
| Alternate Title: |
Effect of weaning method on the onset of puberty in beef bulls. (English) |
| المؤلفون: |
Cedeño, A., Barajas, J. L., Andrada, J. S., Ortega, J. A., Tríbulo, R., Tríbulo, H. E., Bó, G. A. |
| المصدر: |
Taurus; Sep2018, Issue 79, p10-17, 8p |
| Abstract (English): |
Two experiments were carried out to evaluate the onset of puberty of in calves that were weaned early (45 days of age) vs those (control) which were weaned with the traditional management at 6 months of age. A total of 53 bulls calves were randomly divided to receive one of two methods of weaning (experiment 1: 26 animals Brangus breed and experiment 2: 27 animals Bonsmara breed). Precocious weaning (PW) with Ruter ® (ACA, Argentina) and traditional weaning (TW). All calves were weighed once a month from 45 days of age until 18 months of age. Scrotal circumference (SC) measurements were initiated at 6 months of age when bulls reached 26 cm in SC, semen was extracted by electroejaculation (Pulsator IV®, Denver, USA) to evaluate the onset of puberty. Puberty was defined as the time in which bull calves produced 50 million total spermatozoa with 10% progressive motility (25) and at the same time a seminal morphology analysis was performed. The data were analyzed using the MLGM procedure (InfoStat, UNC). No significant differences were found between SC at puberty, weight at puberty, and weeks at puberty, weight gain and final weight up to 18 months of age in experiment 1 and 2 (P≥0.13). No differences were found in the levels of T4 in the animals of experiment 1 (P=0.11). In the experiment 2 the group of TW animals had a tendency to a greater weight than the PW group at 11 and 12 months of age (P=0.09), however, no differences were found on the age at puberty. In addition, no interactions were found between the variables studied. It is concluded that type of weaning does not affect the onset of puberty and weight gain in beef bulls. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): |
Se realizaron dos experimentos con el objetivo de evaluar el inicio de la pubertad de toritos destetados precozmente (DP) con Ruter ® (Asociación de Cooperativas Argentina, ACA, Argentina) vs un grupo control destetado tradicionalmente (DT). Se utilizaron 53 animales de carne para recibir uno de dos métodos de destetes (experimento 1: 26 animales raza Brangus y experimento 2: 27 animales raza Bonsmara). En ambos experimentos todos los animales fueron destetados a partir de los 45 días de vida y de ese momento en adelante fueron pesados rutinariamente una vez por mes hasta los 18 meses de edad. A partir de los 6 meses de edad en adelante se les midió la circunferencia escrotal (CE) y cuando alcanzaron 26 cm de CE se procedió a extraer semen mediante electroeyaculación (Pulsator IV®, Denver, USA). Al mismo tiempo se realizó un análisis de morfología seminal. Solo los animales del experimento 1 fueron testeados para medición de T4. Los datos fueron analizados mediante el procedimiento MLGM (InfoStat, UNC). En los experimentos 1 y 2 no se encontraron diferencias significativas entre la CE a la pubertad, el peso a la pubertad, y semanas a la pubertad, ganancia de peso y el peso final de la prueba hasta los 18 meses de edad (P≥0,13). Tampoco se encontraron diferencias en los niveles de T4 en los animales del Experimento 1 (P=0,11). En el experimento 2 el grupo de animales DT tuvo una tendencia a un mayor peso que el grupo DP a los 11 y 12 meses de edad (P=0,09), sin embargo, no se encontraron diferencias en la edad a la pubertad. Además, no se encontraron interacciones entre las variables estudiadas. Se concluye que tipo de destete no afecta la llegada a la pubertad de toritos de razas carniceras. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
