[2] Breeds of Livestock, Reference: Joshi, N.R., Phillips, R.W. (1953) Zebu Cattle of India and Pakistan, FAO Agriculture Studies No. 19, Publ. By FAO, Rome, 256 pp.
outlookindia.com
[1] Ongole bulls are prized as they are said to be resistant to mad cow disease - source Outlook India.
