J. SINGH, R. KASRIJA, G. S. DHALIWAL, V. K. GANDOTRA, and M. HONPARKHE, “Effect of post-insemination progesterone supplementation on conception rates in repeat breeding cattle”., Indian J of Anim Sci, vol. 78, no. 3, Mar. 2011, doi: 10.56093/ijans.v78i3.4639.