176 Scientific Journal of Animal Science (2014) 3(6) 176-183 ISSN 2322-1704 doi: 10.14196/sjas.v3i6.1420 Haematological and serum biochemical responses of Jersey and three indigenous cow breeds at two physiological states in a humid tropical environment E.O. Ewuola a, *., O.A. Olorunnisomo b , F.G. Oyeniyi a , A.A. Oni c a Animal Physiology Laboratory, Department of Animal Science, b Dairy Science Unit, Department of Animal Science, c Department of Veterinary Surgery and Reproduction, University of Ibadan, Ibadan, Nigeria. *Corresponding author: Animal Physiology Laboratory, Department of Animal Science, University of Ibadan, Ibadan, Nigeria; Email: bisi_ewuola@yahoo.co.uk; +234(0) 80-6086-2361. A R T I C L E I N F O Article history, Received 06 May 2014 Accepted 20 June 2014 Available online 29 June 2014 Keywords, Haematology Serum biochemistry Cow breeds Humid tropics Physiological state A B S T R A C T Twenty cows of four different breeds (Jersey (4Ϳ, N’Daŵa ;ϰͿ, White Fulani (4) and Sokoto Gudali (8)) were used to assess their haematological and serum biochemical responses at two different physiological states. At dry (pre-gestation) phase, haemoglobin (Hb) concentration, Mean Corpuscular Volume (MCV), Mean Corpuscular Haemoglobin Concentration (MCHC), neutrophils, monocytes and eosinophils were not significantly different among the breeds. Hoǁeǀer, PaĐked Đell ǀoluŵe ;PCVͿ of N’Daŵa ǁas sigŶifiĐaŶtly (P<0.05) lower than White Fulani but not significantly different from Jersey and Sokoto Gudali. Erythrocytes count of Jersey breed was not significantly different from White Fulani and Sokoto Gudali but sigŶifiĐaŶtly ;P<Ϭ.ϬϱͿ loǁer thaŶ N’Daŵa. Platelet ĐouŶts of Jersey, N’Daŵa aŶd Sokoto Gudali ǁere significantly (P<0.05) lower than the White Fulani breed. Leukocytes count in Jersey was not significantly differeŶt froŵ that of N’Daŵa ďut it ǁas sigŶifiĐaŶtly ;P<Ϭ.ϬϱͿ higher than that of White Fulani and Sokoto Gudali breeds. Lymphocytes count of Jersey, White Fulani and Sokoto Gudali were identical but sigŶifiĐaŶtly ;P<Ϭ.ϬϱͿ loǁer thaŶ that of N’Daŵa ďreed. Seruŵ biochemical variables were not significantly influenced by the breeds except glucose, total protein and globulin. Serum glucose was higher Contents lists available at Sjournals Journal homepage: www.Sjournals.com Original article