STUDIES ON LIBIDO AND SERUM TESTOSTERONE CONCENTRATION OF CHOLISTANI AI BULLS UNDER STRESS FREE AND STRESSFUL SEASONS - S. A. Mahmood; A. Ijaz; N. Ahmad; H. U. Rehman; H. Zaneb; U. Farooq Semen Production Unit; Karaniwala; Bahawalpur; Pakistan (Journal of Animal and Plant Sciences, 2013)