Abdul Azeez, C.PMeenuja, M S2019-02-192019-02-1911-12-17KVASU reference stylehttp://krishikosh.egranth.ac.in/handle/1/5810095886The study was conducted in eight post-partum Vechur cows having normal calving history and puerperium with the objectives of gynaecological and ultrasonographic studies to evaluate the post-partum uterine and ovarian changes in and to estimate progesterone profile to assess the post-partum resumption of ovarian activity. The characteristics of lochial discharge such as colour, volume, consistency and odour were assessed. Per-rectal examination, ultrasonographic examination and blood collection of the cows were performed on weekly interval starting from the day seven to day 91 post-partum to assess the cervical and uterine involution and ovarian activity. On per-rectal examination, cervix was observed to be involuted between 35 to 42 day post-partum. Previously gravid and non-gravid uterine horns were observed to be involuted between 28 to 35 days and 21 to 28 days post-partum, respectively. On ultrasonographic examination, the echogenicity of the cervix and uterus was observed to be increased as the involution proceeded and both uterine horns involuted between 35 to 42 days post-partum. Per-rectal examination of the ovaries revealed the presence of palpable corpus-luteum and follicles on mean 21 ± 8.50 and 30.63 ± 5.11 days post-partum, respectively. Resumption of ovarian activity was found to be achieved on mean 13.13 ± 0.88 days post-partum as evidenced by serum progesterone level above 1 ng/ml. The estimated serum Ca, P levels and Ca: P ratios were not having any significant difference between the days of observation. Onset of post-partum behavioural oestrus signs were observed by mean 49.71 ± 7.76 days with a graded oestrus intensity of intense, intermediate and weak in 57.15, 29.57, and 14.28 per cent of cows, respectively.ennullThesis