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EPD's with reciept cows
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<blockquote data-quote="Brandonm2" data-source="post: 469270" data-attributes="member: 2095"><p>Actual birthweight can vary anywhere between 55 lbs and 140 lbs depending on the genetics, the nutrition, the length of the pregnancy, and the volume of the cow; but the EPD only varies from -.9 to 8.3 between the best 1% and the worst 1% of the breed (I am using Hereford as the example). That is only a 9.2 lb spread in the EPDs and the real world spread in a calf crop CAN be 50-70 lbs. The EPD is just an average. ANY bull probably has some 75 lb calves and some 90 lb calves out there. All the EPD is telling you is that a -.9 EPD bull is going to have more light ones than heavy ones and that at +8.3 EPD bull is going to have more heavy calves than light ones. A big long wide sprung deep ribbed mature cow is going to throw heavier calves than small frame heifers will. IF I had to guess I would guess that the cow (fetal environment) probably is responsible 80% of the birth weight expression and the genetics of the calf are only about 20%.</p></blockquote><p></p>
[QUOTE="Brandonm2, post: 469270, member: 2095"] Actual birthweight can vary anywhere between 55 lbs and 140 lbs depending on the genetics, the nutrition, the length of the pregnancy, and the volume of the cow; but the EPD only varies from -.9 to 8.3 between the best 1% and the worst 1% of the breed (I am using Hereford as the example). That is only a 9.2 lb spread in the EPDs and the real world spread in a calf crop CAN be 50-70 lbs. The EPD is just an average. ANY bull probably has some 75 lb calves and some 90 lb calves out there. All the EPD is telling you is that a -.9 EPD bull is going to have more light ones than heavy ones and that at +8.3 EPD bull is going to have more heavy calves than light ones. A big long wide sprung deep ribbed mature cow is going to throw heavier calves than small frame heifers will. IF I had to guess I would guess that the cow (fetal environment) probably is responsible 80% of the birth weight expression and the genetics of the calf are only about 20%. [/QUOTE]
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EPD's with reciept cows
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