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2. Comparative results of breeding on the first and second post-foaling heat periods;Liuex;Proc Am Assoc Equine Pract,1980
3. Veterinary Obstetrics and Genital Diseases;Roberts,1986
4. Some Common Problems in Horse Breeding;Jennings;Cornell Vet,1941
5. The Estrus Cycle of the Mare;Trum;Cornell Vet,1950