ASSESSMENT OF OPTIMAL OSMOTIC PRESSURE OF CITRATE EGG YOLK EXTENDER FOR CRYOPRESERVATION OF BUFFALO BULL (B UBALUS BUBALIS) - SEMEN D. H. Mughal; A. Ijaz; M. S. Yousaf; H. Rehman; M. Aleem; H. Zaneb; F. Wadood (Journal of Animal and Plant Sciences, 2013)