1. Canine gestation length: variation related to time of mating and fertile life of sperm;Concannon;Am. J. Vet. Res.,1983
2. Onset of diestrus in the Beagle bitch: definition and significance;Holst;Am. J. Vet. Res.,1974
3. Biology and endocrinology of ovulation, pregnancy and parturition in the dog;Concannon;J. Reprod. Fertil. Suppl.,1989
4. The ovarian cycle of the bitch: plasma estrogen, LH and progesterone;Concannon;Biol. Reprod.,1975
5. Changes in LH, progesterone and sexual behavior associated with preovulatory luteinization in the bitch;Concannon;Biol. Reprod.,1977