1. Influencia de algunos factores climaticos sobre la duracion de la gestacion de yeguas fina sangre de carrera: estudiio preliminary (the influence of some climatic factors on pregnancy duration in Thoroughbred mares: preliminary account);Astudillo;Zoolatria,1960
2. Length of gestation period of horses and ponies belonging to different breeds;Bos;Livestock Prod. Sci.,1980
3. Physiological and pathological significance of the duration of gestation in the mare;Britton;J. Am. Vet. Med. Ass.,1943
4. Evans, W.J., Torbeck, R.L., 1998. Breeding Management and Foal Development, Equine Research Incorporated, Texas. pp. 700.
5. Contribution to the problem of gestation length in the horse and factors relating to it;Flade;Arch.Tierz.,1963