Ovarian Follicular Dynamics in Caqueteño Creole Cattle Breed at the Colombian Amazon Piedmont

Caqueteño creole cattle breed is part of the eight Colombian creole cattle breeds. These breeds are characterized by having great adaptive potential to the environmental conditions in which they are found and allowing them greater productive efficiency. Caqueteño creole cattle is a breed in danger of extinction according to parameters referenced by FAO, since it is a population of cattle made up of fewer than 350 individuals. This situation suggests the development of multiple research activities with a reproductive focus to efficiently implement biotechnologies and increase the number of animals. Moreover, this investigation included in the process with n = 10 reproducibly viable multiparous females were used, estrous was synchronized and the transrectal ultrasonography was performed during 27 consecutive days every 24 h (8:00 h) with DP 10 Mindray®, equipped with 7.5 MHz linear transducers. Ninety percent of the sampled population (9/10) responded to the synchronization protocol, of which n = 3 females showed two follicular waves during their Estrous Cycle (EC), with a duration of 20±0.6 days. Meanwhile, that n = 6 females presented three follicular waves during the 22±0.5 days of their EC. The Corpus Luteum (CL) stays a few days longer (19±0.96 days) in individuals of three waves, while in the two lasts until day (17±1). In conclusion, the cows of the Caqueteño creole cattle breed tend to present three follicular waves during EC, having an impact on the increase of the interovulatory interval.