1. Anon.: Statistics of the activity of milk recording societies in Finland 1986. In Publications of the Board of Agriculture 1986, 411.
2. Arthur GH: Retention of the afterbirth in cattle: a review and commentary. Vet. Ann. 1979, 19, (26–36).
3. de Bois CHW: Some aspects of the therapy and prophylaxis of retained placenta and puerperal endometritis in the cow. In Factors influencing fertility in the postpartum cow. Martinus Nijhoff, Hague, 1982, p. 497–509.
4. Dyrendahl I, Mattson J, Pehrson B: Retained placenta in cattle - Incidence, clinical data and effects on fertility. Zbl. Vet. Med. 1977, 24, (529–541).
5. Heinonen K, Gröhn Y, Lindberg LA, Alanko M: The effect of mild fat infiltration in the liver on the fertility of Finnish Ayrshire cows. Acta vet. scand. 1988, 25, (151–155).