Dinamica Folicular En Yeguas Criollas Colombianas
ABSTRACT Follicular dynamic and luteal function during the early gestation. Study of a case in Bos indicus. To a Zebu(Bos indicus) cow with six year old, three calves and 432 kg of live weight, were practiced transrectal ovarial ultrasonographies and blood samplings three times a week from the Day one to the 74 of gestation. It was counted the number of follicles >4mm and was measured the diameter of the follicles and the diameter and the ecographic time observation of the corpus luteum. It was determined theovulation and was calculated the growth rate of the dominant follicle and the interdominance interval. The levels of progesterone were measured by radioimmunoassay. During the first 74 days of the gestation were developed 10 follicular waves; the first was conformed by six follicles >4mm, one of which was developed to dominant and reached a diameter of 11mm, grew at a rate of one mm/day andpresented an interdominance interval of 10 days. The more developed subordinate follicle reached a diameter of 6mm. The mean dominant follicles diameter was 9.1±1 mm, the mean growth rate was 1.0±0.19mm/day and the mean interdominance interval was 7.5±1.73 days. The corpus luteum reached a maximum diameter of 21mm the Day 40 of gestation. The progesterone reached levels >10 ng/100ml from day 11. Duringthe early gestation of a Zebu cow was presented follicular dynamic characterized by development of follicular waves similar to the produced during the estrous cycle and was formed an active corpus luteum with characteristic levels of progesterone. Key words:. Corpus luteum. Follicular dynamic. Gestation. Zebu Agradecimientos: A COLCIENCIAS por la financiación parcial de esta investigación. A laUniversidad Nacional de Colombia por el aporte de vaquero, instalaciones y semovientes. A laboratorios LABCO Ltda por el préstamos de sus equipos para radioinmunoanálisis.
INTRODUCCIÓN Los ovarios exhiben estados tempranos de desarrollo folicular casi continuamente desde el nacimiento hasta la edad adulta, aún durante la gestación (Driancourt, 1991). El crecimiento folicular ovárico bovino se...
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