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CONCEPTION AND PREGNANCY: THE MAKING OF A PUPPY
about to ovulate: Gardiner J. (2019). Ovulation Timing in the Dog. UC Davis Veterinary Medicine. https://healthtopics.vetmed.ucdavis.edu/health-topics/canine/ovulation-timing-dog
actually detect: Woszczylo M, Jezierski T, Szumny A, Nizanski W, Dzieciol M. (2020). The Role of Urine in Semiochemical Communication between Females and Males of Domestic Dog (Canis familiaris) during Estrus. Animals (Basel). doi: 10.3390/ani10112112.
Amazingly. Concannon P. (2000). Canine Pregnancy: Predicting Parturition and Timing Events of Gestation. Recent Advances in Small Animal Reproduction. https://www.researchgate.net/publication/237260118_Canine_Pregnancy_Predicting_Parturition_and_Timing_Events_of_Gestation
The Single Egg. Fletcher T, Weber A. (2013). Early Embryogenesis. Veterinary Developmental Anatomy. http://vanat.cvm.umn.edu/vanatpdf/EmbryoLectNotes.pdf