International Journal of Agriculture Extension and Social Development

author(s)
Hitesh, Manas Kumar Patra, Gangula Athidi Lokavya, Amit Kumar Singh, Renu Sharma and Kalpendra Kohli

abstract
Buffaloes show seasonality in their reproductive behaviour with diminished performance in the hotter months of the year. A group of eight cyclic healthy buffaloes was selected from breeding herd of buffaloes present at IVRI, Izatnagar. They were examined via trans-rectal ultrasonography to study the pattern of their ovarian activity during the months from April to June, 2021. The average length of the estrous cycle was 20.13±1.67 days with majority of buffaloes showing two-wave pattern followed by one-wave and three-wave pattern. The anovulatory dominant follicle attained maximum diameter 10.78±0.37 mm in duration of 7.60±0.45 days followed by its regression and the onset of a new wave. The ovulatory follicle grew at a faster pace and ovulated after achieving a maximum diameter of 13.18±0.35 mm and later transformed in a corpus luteum achieving a mean maximum diameter of 18.20±0.70 mm by day 12.20±1.26 post-ovulation. Later, the regression of this CL led to the onset of a new wave.