Hasan, M.M., Islam, M.R., Husain, S.S. and Apu, A.S. 2020. Frozen semen quality and fertility of imported pure Holstein Friesian and Sahiwal breeding bulls in Bangladesh. Asian-Australasian Journal of Bioscience and Biotechnology. 5, 1 (Apr. 2020), 33–41. DOI:https://doi.org/10.3329/aajbb.v5i1.53861.