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A +9 Birthweight EPD for a cow (assuming it is a +9 EPD that you're referring to) means that, in comparison to other cows of the same breed, size, weight, and environmental conditions they were raised in, that cow has a VERY high birth weight in comparison to the average (being an EPD of 0). That cow may be 9 lbs heavier at birth than the other cows, and/or she gave birth to a calf that weighed 9 lbs heavier than what the other cows (all of the same breed, age, weight, frame size, raised in the same environmental conditions, etc.) had.

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Q: What does 9 birth mean for an epd cow?
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