Examinando por Materia "Razas criollas"

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  • Artículo
    Acceso abierto
    Dinámica folicular y cuantificación de estradiol durante el cicloestral de vacas criollas de la raza Blanco Orejinegro
    (2020) Narváez-Bedoya, Héctor Javier; Silva-Rojas, Andrea Viviana
    The aim of this study was to characterize follicular dynamics and quantify oestradiollevels during an oestrous cycle in cows of the creole breed Blanco Orejinegro. Ten cowsthat were cycling were selected and underwent an oestrous synchronization protocolwith the initial application of an intravaginal progesterone device (CIDR®) plus 2 mg ofestradiol benzoate (day 0 - D0). On day D8 the device was removed and 150 μg ofcloprostenol (Ciclase DL®) was inyected. In D9 1 mg of oestradiol benzoate wasadministered. After ovulation, ultrasound scans were performed every 24 hours, recordingfollicular dynamics and collecting blood for oestradiol quantification. The oestrous cycleduration was 21.0 ± 0.4 days, the diameter of the ovulatory follicle was 14.3 ± 0.5 mm andof the major subordinate follicle was 6.0 ± 0.5 mm, the growth rate of the dominant follicleduring the 96 hours prior to ovulation was 1.05 ± 0.4 mm/day. In conclusion, the folliculardynamics and oestradiol levels of creole cows of the Blanco Orejinegro breed presentsimilar patterns to those observed in Bos taurus and Bos indicus breeds.