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3. Esslemont R. J., A study of the economic and husbandry aspects of the manifestation and detection of oestrus in large dairy herds. Ph.D. thesis (1973). University of Reading.
4. Estrus detection and estrus detection aids;Foote;J. Dairy Sci.,1975
5. Anoestrus in cattle;Boyd;Vet. Rec.,1977