Tiwari, R. P.KUMR PAIKRA, DILIP2018-01-062018-01-062016http://krishikosh.egranth.ac.in/handle/1/5810038916Present investigation was carried out to study the “Ultrasonographic studies of ovarian activity in postpartum anestrous Sahiwal cows”. A total of 14 anestrous Sahiwal cows with normal parturition of more than 65 days after parturition were selected for present study from Bull Mother Experimental Farm (B.M.E.F.), College of Veterinary Sci. & A.H., Anjora, Durg. These animals were randomly divided into two groups. Animals (n=7) control group were given 2.0 ml normal saline intramuscularly and animals (n=7) treatment group were given injection GnRH @ 10 μgm intramuscularly on day 0. The animals in both groups were monitored at three days interval for 24 days, i.e. day 0, 3, 6, 9, 12, 15, 18, 21 and 24 days using transrectal ultrasonography (5-7.5 MHz) for development of ovarian follicles. The blood samples were collected from all experimental animals on days 0, 11 and 22 to estimate concentrations of serum progesterone, serum macroelements calcium, phosphorus, magnesium and serum trace elements iron, copper, cobalt and zinc. The levels of macro elements and trace elements were compared among cyclic and acyclic animals of treatment and control groups. Significantly higher number of animals came in estrus (57.14% Vs. 28.57% (P < 0.05) in treatment than control group. significantly larger follicle were observed on day 3, 12 (P < 0.05) and 24 (P < 0.01) in treatment group than control group. The serum progesterone level was higher on day 0, 11 and 22 in treatment group. However the difference was statistically non-significant. The serum copper concentration was significantly (P < 0.05) higher in cyclic group. However there was non-significant difference in serum macro elements, calcium, phosphorus, magnesium and serum trace elements, iron, cobalt and zinc concentration in cyclic group and acyclic group of animals.ennullThesis