1. Biology and endocrinology of ovulation, pregnancy and parturition in the dog;Concannon;J Reprod Fertil,1989
2. Endocrine regulation of the corpus luteum of the bitch as a potential target for altering fertility;Olson;J Reprod Fertil,1989
3. Reproductive cycles of the domestic bitch;Concannon;Anim Reprod Sci,2011
4. Effects of whelping and season of the year on the interestrous intervals in dogs;Linde-Forsberg;J Sm Anim Pract,1992
5. Seasonal incidence of estrus and interestrus interval for bitches of seven breeds;Sokolowski;J Am Vet Med Assoc,1977