References
- Anon Statistical indicators for the planning and evaluation of public health programmes: 11th report of the World Health Organisations expert committee on health statistics W. H. O. Tech. Reports No. 365 1971
- Cote , J. F. 1976 . A preventative medicine programme for dairy cattle in Southern Ontario . Vet. Annual. , 16 : 7 – 12 .
- Daniel , R. C. W. , Smith , G. C. and Barnum , D. A. 1966 . Relation between California Mastitis Test scores and milk production . vet. J. , 7 : 99 – 105 .
- Davis , C. E. 1976 . The effect of regression to the mean in epidemiologic and clinical studies . Am. J. Epidemiol. , 104 : 493 – 498 .
- Dodd , E.H. , Neave , F. K. , Kingwell , R.G. , Griffin , T.K. , Wcsigarth , D.R. and Wilson , C.D. 1970 . The effect of a mastitis control system on levels of subclinical and clinical mastitis . 6th Int. Conf. Cattle Dis. , 6 : 157 – 165 .
- Ederer , F. 1972 . Serum cholesterol: effects of diet and regression toward the mean . J. Chron. Dis. , 25 : 277 – 289 .
- Grunsell , C. S. , Penny , R. H. C , Wragg , S. R. and Allcock , J. 1969 . The practicability and economics of veterinary preventive medicine . Vet. Rec , 84 : 26 – 41 .
- Herschier , R. C , Miracle , C , Crowl , B. , Dunlop , B. S. and Judy , J. W. 1964 . The ecnomic impact of a fertility control and herd management program on a dairy farm . J. Amer. vet. med Ass. , 145 : 672 – 676 .
- MacMahon , B. and Pugh , T. F. 1970 . Epidemiology: principles and methods , 376 – 376 . Boston : Little, Brown & Co. .
- Madsen , P. S. , Kalstrup , O. , Olsen , S. J. and Pedersen , P. S. 1975 . Herd incidence of bovine mastitis in four Danish dairy districts: II. Evaluation of the effect of the mastitis control scheme . Nord vet. Med , 27 : 305 – 318 .
- Moller , K. 1977 . Introducing PA HAPS , Wellington : Animal Health Division, Ministry of Ag. & Fish .
- Morris , R. S. 1969 . Assessing the ecnomic value of veterinary services to primary industries . Aust. vet. J. , 45 : 295 – 300 .
- Morris , R. S. 1973 . The depression of quarter milk yield caused by bovine mastitis, and the response of yield to successful therapy . Aust. vet. J. , 49 : 153 – 156 .
- Morris , R. S. 1975 . Criteria for the design and evaluation of bovine mastitis control systems . International Dairy Federation Proceedings , 85 : 395 – 409 . In
- Schulberg , H. C. , Sheldon , A. and Baker , F. , eds. 1970 . Program evaluation in the health fields , N.Y. : Behavioural Publications .
- Smith , A. R. and Ward , G. E. 1975 . Evaluation of methods for control of Streptococcus agalactiae in dairy herds . Can. vet. J. , 16 : 109 – 113 .
- Spedding , C. R. W. 1975 . The biology of agricultural systems , London : Academic Press .
- Wilhelmsen , L , Ljungberg , S. , Wedel , H. and Werko , L. 1976 . A comparison between participants and non-participants in a primary preventive trial . J. Chron.Dis , 29 : 331 – 339 .