Vol. 9, Issue 1, Part E (2024)

This study was undertaken on 26 Mehsana buffaloes maintained at Livestock Research Station, S.D.A.U., Sardarkrushinagar, Gujarat (India). These buffaloes were monitored for their post-partum reproductive performance through per-rectal examination and pregnancy was confirmed at day 60 after natural service. Buffaloes were grouped retrospectively on the basis of fertile estrus in to, Group I (Buffaloes conceiving before 90 days) and Group II (Buffaloes conceiving after 90 days). Blood samples were collected on the day of calving, 10th, 20th and 30th day postpartum. The mean plasma progesterone (ng/ml) ranged between 0.18±0.01 to 0.31±0.02 in Group I and 0.24±0.01 to 0.48±0.02 in Group II with significantly (p<0.05) lower P4 in Group I buffaloes. The mean plasma tri-iodothyronine (ng/ml) and thyroxine (nmol/L) ranged between 1.23±0.55 to 2.30±0.68 and 42.67±3.64 to 57.92±4.43 in Group I, 1.02±0.15 to 1.74±0.15 and 40.48±2.40 to 44.07±2.69 in Group II, respectively and were found to be significantly (p<0.05) higher at day 20 in group I buffaloes. The gross uterine involution occurred at 28.20±1.10 and 29.80±0.20 days in group-I and group-II, respectively. The average days for the gross uterine involution did not differed significantly between the groups.