Vol. 9, Special Issue 2 (2024)

The study was conducted to find out hormonal profile during different stages of estrrous cycle in estrus synchronized Kangayam cows. A total of 10 Kangayam cows between 3^rd and 5^th calving were selected and serum samples were collected on day 0, 5, 9 and 18^th day of synchronized estrous cycle. The profiles of progesterone (P4), estradiol (E2), follicle stimulating hormone (FSH) and luteinizing hormone (LH) during different phases of estrous cycle were estimated. The results revealed that in proestrus phase, the P4 concentration was 1.45±0.1 ng/mL whereas estradiol and FSH concentration were 20.44±0.2 pg/mL and 1.62±0.07 IU/mL, respectively. The level of LH during proestrus was 1.81±0.04 IU/mL. The P4 concentration dropped to 0.36±0.2 ng/mL during estrus phase and the estrdiol and FSH were increased to 24.29±0.3 pg/mL and 2.05±0.2 IU/mL, respectively. However, estradiol and LH level dropped in metestrus and diestrus phase 12.53±0.1 pg/mL, 1.05±0.01 IU/mL and 14.56±0.1 pg/mL,1.54±0.02 IU/mL respectively. The results of the study could be useful to various hormonal intervention studies of Kangayam animals to improve the reproductive performance.