1. Reproduction in farm animals;Hafez,1974
2. Calving outcomes for cows diagnosed pregnant or nonpregnant by per-rectum examination at different intervals after insemination;White;Can. Vet. J.,1989
3. Optimal time post breeding for pregnancy examination in dairy cattle;White;Can. Vet. J.,1989
4. Effect of three methods of palpation for pregnancy diagnosis per rectum on embryonic and fetal attrition in cows;Abbitt;J. Am. Vet. Med. Assoc.,1978