1. Sterilitas sine materie — Sterility not clinically diagnosable;Ayalon,1964
2. A survey of the role of nutrition in sterility of dairy cattle;Durrell;Can. J. Comp. Med. & Vet. Sc.,1951
3. An experimental study of the causes of a nutritional and lactational stress infertility of pasture-fed cows associated with a loss of bodyweight at about the time of mating;McClure;Res. in Vet. Sc.,1970
4. The relationship between the milk fat percentage and fertility in dairy herds;Francos;Ref. Vet.,1968
5. Observations on the relationship between fertility and butterfat percentage in three dairy herds;Francos;Ref. Vet.,1969