My girls start flagging well before they show signs of anything, swelling, pinkness, etc. and continue until about a week after they are bred. When they are bred (10-14th from initial day of showing color and I've bred on the 16th day) does not determine when they are fertile, ovulation can be at anytime during that week. That's why we breed twice with a day inbetween. She can ovulate a day after she is bred. That's why we count whelping dates from the 58-63rd day.
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