1 FAO (1989) Milk, Milk production, hygiene and udder health. In animal production and health year book. 78: 69-72.

2 Mugrewa M (1989) Introduction. A Review of Reproductive Performance of Female Bos Indicus (Zebu) Cattle. ILCA Monograph 6: 1-4.

3 Belowey R (1985) Milk synthesis, and mastitis In: A Veterinary Book for Dairy Farmers, Farming press Ltd. Grat Britain.

4 Radostitis OM, DC Blood, CC Gay (1994) Mastitis In: Veterinary medicine: A text book of the disease of cattle, sheep, pigs, goats and horses (8th Edn) W.B. Saunders Company, USA.

5 Schalm DW, EJ Caroll, C Jainn (1971) Bovine mastitis. Lea and Febiger Philadelphia, USA.

6 Hussein N (1999) Cross sectional and Longitudinal study of Bovine Mastitis in Urban and peri Urban dairy production systems in the Addis Ababa Region, Ethiopia. MSc thesis, Faculty of Veterinary Medicine, Addis Ababa University, DebreZeit, Ethiopia.

7 Tola T (1996) Discussion, Bovine Mastitis in indigenous Arsi Breed and Arsi Hlesteinrosses. DVM Thesis, FVM, A.A.U. Ethiopia.

8 Quinn PJ, ME Carter, B Markey, Carter GR (1999) Clinical veterinary microbiology, Mosby publishing, London.

9 Thrustfield M (1995) Veterinary epidemiology (2nd Edn) Wiley Blackwell Science, USA.

10 Carter GR (1984) Diagnostic Procedures in Veterinary Bacteriology and Mycology (4th Edn) Charles C. Thomas publisher, USA.

11 Biru G (1989) Major bacteria causing bovine Mastitis and their sensitivity to common antibiotics. Ethiopian J Agri Sci 11: 43-9.

12 Zerihun T (1996) A study on Bovine Sub-Clinical Mastitis at Stela Dairy Farm, DVM Thesis, FVM, A.A.U. Ethiopia.

13 Tolossa A (1987) A survey of bovine Mastitis around Kallu province, DVM Thesis, FVM, A.A.U. Ethiopia.

14 Robertson R (1985) The Use of EF Cow Milk NAGase test in Mastitis control programmer flow laboratories, Ayshire, Scotland.

15 Husein N, Yehualashet T, Tilahun G (1993) Prevalence of mastitis in different local and exotic breeds of milking cows. Proceedings of the fourth National Livestock Improvement Conference, IAR, Addis Ababa Ethiopia.

16 Sori H (1997) Bovine Clinical and sub clinical Mastitis in Indigenous Zebu and Cross breed Cattle in and Around Sebeta, DVM thesis, Faculty of veterinary medicine, Ethiopia.

17 Shbeshi G (1996) Discussion- prevalence and Anthology of sub-clinical Mastitis in Friesian Indigenous zebu crosses and indigenous zebu breeds of dairy cows in and around Bahir Dar, DVM, FVM thesis, FVAAU, Ethiopia.

18 Haile T (1995) Discussion: Bovine Mastitis in Indigenous zebu and Boran-Holestein crosses in South Wollo, DVM thesis, FVM, AAU, Ethiopia.

19Mekuria M (1986) Prevalence and a etiology of Bovine Mastitis in Bahir Dar, DVM Thesis, FVM, AAU, Ethiopia.

20 Dodd FM (1982) Mastitis –progress on control. J Dairy Sci 66: 1773-80.

21 Pearson JKL, Mackie DP (1979) Factors associated with the occurrence, cause and out-come of clinical Mastitis in dairy cattle. Vet Rec 105: 456-63.

22 Vest Weber JG (1994) Staphylococcus aureus Mastitis part 2, Diagnostic Aids, Therapy, and control. Comp Cont Educ for Pract Vet 16: 217-25.

23 Clalence FM, Bergeron JA, Susan AM, Aiello E (1991) Mastitis in large Animal In: The Merck Veterinary Manual (7th Edn) Merck and Co. Inc. Rahway, NJ, USA.

24 Alemnew M (1999) Epidemiological and Bacteriological Investigation of Bovine Mastitis at Modjo state Owned Dairy Farm, DVM Thesis, FVM, AAU, Ethiopia.

25 Dodd FM (1983) Mastitis –progress on control J Dairy Sci 66: 1773-80.

26 Moxley JE, BW Kennedy, BR Downey, JST Bowman (1978) Survey of Milking Hygiene Practice and Their Relation Ships to Somatic cell counts Milk Production. J Dairy Sci 61: 1637-44.