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Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2004;17(3): 313-316.
DOI: https://doi.org/10.5713/ajas.2004.313    Published online January 1, 2004.
Uterine Involution and Ovarian Follicular Growth during Early Postpartum Period of Murrah Buffaloes (Bubalus bubalis)
I. S. Lohan, R. K. Malik, M. L Kaker
Abstract
Ultrasonographic studies were conducted on eight Murrah buffaloes daily from day 6 postpartum (pp) onwards till day 77 pp to monitor changes in the cervix, uterine horn and ovarian follicular growth and development. The mean size of horn and cervix on day six (9.07 0.74 and 8.58 0.00 cm) decreased significantly to 4.09 0.09 and 3.56 0.08 cm by day 27 pp, respectively. Follicles in 50% of the buffaloes ovulated within 24 to 54 days pp and the size of the largest follicle on different days increased to more than 5 mm. The remaining 50 percent of animals ovulated after 65 days postpartum. Large size follicles (>8.5 mm) appeared in six out of eight buffaloes between 10 to 30 days pp and five animals had ovulated during early postpartum period. Waves pattern of follicular growth was observed during early postpartum period. Ovulatory follicles growth rate was more than the anovulatory follicles and increase in size was more as compared to the subordinate follicle. Anovulatory follicles persisted for longer period. Mean size of large follicle was more from day 6 to 41 pp and again from 50 to 65 pp in cyclic animals. Second large follicle were large during early postpartum (18 days), thereafter, its size was more in acyclic animals. Small follicles population was less in cyclic animals upto day 50 postpartum. Mean medium size follicle growth pattern did not differ in cyclic and acyclic groups. Large size follicle number was more in cyclic group (5/8) during 14 to 20 days postpartum. Presence of large follicles (>8.5 mm) showed initiation of ovarian activity.
Keywords: Buffalo; Uterine Involution; Follicular Growth; Postpartum


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