Main Article Content
The oocytes recovered from large sized follicles have more potential for both meiotic and embryonic development, which helps in conception rate in cows and buffaloes. This investigation was carried out to study the effect of pre-ovulatory follicle volume, serum concentration of estradiol on conception rate in postpartum cyclical Murrah buffaloes during spontaneous estrus. Twelve postpartum cyclical buffaloes were randomly selected and double artificial insemination was done (Double AI) at an interval of 24 h during oestrus. Sonographic evaluation was performed during natural estrus (First AI) to study the POF volume and pregnancy diagnosis was done on day 28 post AI. Blood samples were collected and serum was separated at the time of first AI to quantify the serum estradiol concentration and it was correlated with the POF volume, oestrus intensity and conception rate. It is concluded that the pre-ovulatory follicle volume, the serum estradiol 17β concentrations and oestrus intensity on the day of AI had no correlation with conception rate in postpartum buffaloes.
Kastelic, J.P., D.R. Bergefelt and O.J. Ginther. 1991. Ultrasonic detection of the conceptus and characterization of intrauterine fluid on days 10 to 22 in heifers. Theriogenology, 35(3): 569-581. Available on: DOI: 10.1016/0093-691X(91)90453-K
Kastelic, J.P., S. Curran and O.J. Ginther. 1989. Accuracy of ultrasonography for pregnancy diagnosis on Days 10 to 22 in heifers. Theriogenology, 31: 1813-1820. DOI: 10.1016/0093-691x(89)90026-5
Lopes, A.S., S.T. Butler, R.O. Gilbert and W.R. Butler. 2007. Relationship of pre-ovulatory follicle size, estradiol concentrations and season to pregnancy outcome in dairy cows. Anim. Reprod. Sci., 99(1-2): 34-43. DOI: 10.1016/j.anireprosci.2006.04.056
Madan, M.L., S.K. Das and P. Palta. 1996. Application of reproductive technology to buffalo. Anim. Reprod. Sci., 42(1-4): 299- 306. DOI: 10.1016/0378-4320(96)01534-5
Mishra, A.K., B.V. Joshi, P.I. Agarwala, R. Kasiraj, S. Sivaiah, N.S. Rangareddi and M.U. Siddiqui. 1990. Multiple ovulation and embryo transfer in Indian buffalo (Bubalus bubalis). Theriogenology, 33(5): 1131-1141. DOI: 10.1016/0093-691x(90)90073-3
Pandey, A.K., G.S. Dhaliwal, S.P.S. Ghuman and S.K. Agarwal. 2011. Impact of pre-ovulatory follicle diameter on plasma estradiol subsequent luteal profiles and conception rate in buffalo (Bubalus bubalis). Anim. Reprod. Sci., 123(3-4): 169-174. DOI: 10.1016/j.anireprosci.2010.12.003
Pfeifer, L.F.M., S.C.B.S. Leal, A. Schneider, E. Schmitt and M.N. Correa. 2012. Effect of the ovulatory follicle diameter and progesterone concentration on the pregnancy rate of fixed-time inseminated lactating beef cows. Rev. Bras. Zootecn., 41(4): 1004-1008. DOI: 10.1590/S1516-35982012000400024
Rao, S.V. and A.R. Rao. 1981. Oestrus behaviour and ovarian activity of crossbred heifers. Indian Vet. J., 58(11): 881-884.
Ravikumar, K. 2014. Synchronization of ovulation in postpartum buffaloes during peak and low breeding seasons using Ovsynch with CIDR protocols. Ph.D. Thesis, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India.
Varughese, E.E., P.S. Brar, M. Honparkhe and S.P.S. Ghuman, 2014. Correlation of blood flow of the preovulatory follicle to its diameter and endocrine profile in dairy buffalo. Reprod. Domest. Anim., 49(1): 140- 144. DOI: 10.1111/rda.12242