1. A survey of bovine fertility in the north of England;Milk Marketing Board,1957
2. Clinical observations on reproduction in dairy cows;Mylrea;Aust. Vet. J.,1962
3. Observations from field trials, using milk progesterone determination as a tool for the surveyance of fertility;Gunzler;Zuchthyg.,1973
4. The detection of oestrus in dairy cattle;Appleward;Vet. Rec.,1976
5. Plasma progesterone concentrations in dairy cows during the oestrous cycle;Shemesh;Refuah Vet.,1968