AHMED, A., TIWARI, R.P. and MISHRA, G.K. (2016) “Bio-stimulatory effects of bull urine (BU), PRID and GnRH on estrus induction and ovarian activity in pubertal anestrus Sahiwal heifers”, The Indian Journal of Animal Sciences, 86(6), pp. 643–647. doi:10.56093/ijans.v86i6.59158.