Vol. 12, Special Issue 7 (2023)

Author(s):
YV Pridhvidhar Reddy, K Veerabramhaiah, K Mouli Krishna and Y Ravindra Reddy

Abstract:
Sahiwal x Jersey crossbred cows were super ovulated with 250 (G1) and 200 mg (GII) pFSH from d10 to 13 of PGF2α synchronized estrous cycle in divided doses and luteolysis on 72h after initiation of super ovulatory treatment. The concentrations of progesterone at the time of embryo collection were significantly (p<0.05) different between Group I and II. But the difference in the progesterone concentrations at remaining period of study was not significant (p>0.05) between the groups. Concentrations of progesterone during synchronization was negatively and significantly (p<0.05) correlated with recovered ova, anovulation’s, total follicles and total ovulations. Whereas the progesterone concentrations at superovulation PG, super estrus and embryo collection days were positively and significantly (p<0.05) correlated with anovulation’s. Similarly, there was positive and significant (p<0.05) correlation between the total number of follicles and number of ovulations and between total number of anovulation’s and number of embryos recovered in group I. While the progesterone concentrations during synchronization was negatively and significantly (p<0.05) correlated with transferable embryos, total follicles, anovulation’s, recovered ova and embryo collection except between the concentration of progesterone at embryo collection with transferable embryos where the correlation was positive and significant (p<0.05). Similarly, there was positive and significant (p<0.05) correlation between total number of anovulation’s and number of embryos recovered in group II. The concentrations of estrogen at the time of embryo collection were significantly (p<0.05) different between Group I and II. But the difference in the estrogen concentrations at remaining period of study were not significant (p>0.05) between the groups. In the present study concentrations of estrogen during synchronization was negatively and significantly (p<0.05) correlated with total follicles, recovered ova and anovulation’s, while the same was positively and significantly (p<0.05) correlated with recovered ova. Similarly positive and significant (p<0.05) correlation was observed between total number of follicles and ovulations and between total number of anovulation’s and embryos recovered in group I. While during synchronization the estrogen concentration was positively and significantly (p<0.05) correlated with total ovulations, recovered embryos, total follicles and also at super estrus with recovered embryos and transferable embryos in group II. Similarly, there was positive and significant (p<0.05) correlation between total number of anovulation’s and number of embryos recovered in group II.