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Red Chittagong Cattle (RCC) is one of the renownedvarieties of cattle which is indigenous and most potential type of domesticanimal genetic resource in Bangladesh with distinct phenotypic characteristics.Reproductive management might be a process for multiplying this cattle variety.Therefore, the goals of this study were to characterize the follicular waves ofRCC and to determine the Progesterone (P4), Follicle StimulatingHormone (FSH) and Luteinizing Hormone (LH) profile during three consecutiveestrus cycle. Follicular wave emergence (Day 0) was identified usingtrans-vaginal ultrasound technique and follicular growth was then monitoredfrom Day 0 to Day 23 during three consecutive estrus cycle and blood sampleswere collected. After measuring the growth and diameter of the follicles,hormonal assays of collected blood samples were performed using Enzyme LinkedImmunosorbent Assay (ELISA). We found that, both RCC cows and heifers showedtwo waves inter-ovulatory intervals. The length of inter-ovulatory intervalsand the diameter of the ovulatory follicle of RCC cows and heifers wereslightly different from each other. The identification of the dominant folliclewas confirmed from the start of its deviation from other subordinate folliclestill it reached to the maximum diameter and identified as dominant folliclewhich increases linearly for approximately six days (growing phase). Thisdominant follicle is remained approximately same size for five days (staticphase), and then begins to regress (regressing phase) decreasing the antraldiameter. The follicular waves are first detectable as 4 - 5 mm folliclesapproximately at day 0 and day 10 both for RCC cows and heifers which showedtwo waves inter-ovulatory intervals. The circulating varied concentrations ofLH, FSH and P4 were determined using ELISA in case of both cows andheifers and the concentration curves followed the similar pattern of changeduring the estrus cycle. Hence, the knowledge about ovarian follicular waveswill create a base line for reproductive management of RCC as well as to allowreproductive biotechnologies to improve and multiply this cattle variety.

Investigation of Ovarian Follicular Waves and Major Hormonal Profile in Red Chittagong Cattle