author(s)
Boro U, Talukdar DJ, Ahmed FA, Lalrintluanga K, Kalita G and Tolenkhomba TC

abstract
In the present study, it was planned to investigate the incidence and causes of postpartum anoestrus in and around Aizawl district of Mizoram. A total of 300 (three hundred) numbers of cows were examined per rectum after two months of calving to inspect the ovarian and genital status. Out of 300 numbers of cows, 60 (sixty) cows were did not showed oestrus signs within two months of calving, which were further diagnosed as postpartum anestrus. The main causes of postpartum anestrus in these cows were found as overobursal adhesion, cystic ovary, silent estrus, pyometra, metritis, anovulation, subestrus, smooth ovary.