The majority of inseminations performed by veterinarians are performed with freshly collected semen (> 70%).
Refrigerated semen is increasingly used for insemination in France (and Europe).
The bitch has several specific features that allow her to use the progesterone dosage to determine the time of ovulation and especially the ideal time for mating or insemination
Hormonal changes at the end of gestation (increase in estrogen and decrease in progesterone) induce changes in the bitch's thermal "transistor", causing a frequent transient drop, on average in the 48 hours preceding the parting.