References
- 1977 . New Zealand Dairy Board . Statement of Accounts and Statistics , : 16 – 16 . and 22
- Sommer , H. 1975 . Preventative medicine in dairy cows . Vet. med. Rev. , 2/75 : 42 – 63 .
- Zepgi , A. , Rusck , K. , Cornea , F. , Villouta , G. , Concha , M. and Bolsrik , F. 1976 . Metaphy-lactic study and treatment of metabolic and reproductive disorders in dairy cows during the last three months of pregnancy . Vet. med. Rev. , 1/76 : 63 – 71 .