As you know I do progestrone testing on my bitches and only breed when they are at peak of ovulation. The time frame varies on every bitch. But per my vet this is the range a bitch can be at peak of her heat: "Even though she has this three week-plus heat cycle, there is a three to four day window we have to hit that varies from bitch to bitch."
I only breed twice when she's at peak per the progestrone results. In my experience I have NOT had a puppy that was a under developed (for lack of a better term). You theory makes sense but IMO the day or two gap between conception of puppies would be enough to produce a 'runt' or a puppy that is under developed. I have had small puppies in a litter even though I breed twice within a 3 day window but they were just as healthy and strong. One only weighs 2 pounds at 2 yrs old and has not had any set backs.
Again, this is just my experience thus far. |