DEKA, K. C., BORGOHAIN, B. N., NATH, K. C., GOSWAMI, J., BISWAS, R. K., & DAS, P. K. (2007). A comparative appraisal of serum progesterone level during oestrous cycle in normal and repeat breeder crossbred cows with ovulatory problem. The Indian Journal of Animal Reproduction, 28(2), 83-85. https://www.journals.acspublisher.com/index.php/ijar/article/view/5074