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<blockquote data-quote="simme" data-source="post: 1799641" data-attributes="member: 40418"><p>Their weight curve during pregnancy is certainly not linear. 80% of birth weight is gained in the last 90 days. 2/3 of birth weight gained in the last 60 days. Daily rate of gain goes up each day. So expect weight difference for 10 days overdue is more than difference for 10 days early. A calf 2 weeks overdue adds considerable birth weight. </p><p></p><p>At 60 days bred, the calf will weigh less than an ounce. At 90 days, less than half a pound. At 120 days, it will be the size of a small cat. At 150 days, the size of a large cat. At 180 days, the size of a small dog - about 12 to 15 pounds. Then gets to birth weight (70, 80, 90, 100#) in that last 100 days. </p><p></p><p>Just seems to me that birth weight is affected by environment/nutrition, growth genetics of sire and dam, and gestation length. Also leads me to believe that a CE bull due to shorter gestation does not sacrifice weaning weight like that of a CE bull due to less growth.</p></blockquote><p></p>
[QUOTE="simme, post: 1799641, member: 40418"] Their weight curve during pregnancy is certainly not linear. 80% of birth weight is gained in the last 90 days. 2/3 of birth weight gained in the last 60 days. Daily rate of gain goes up each day. So expect weight difference for 10 days overdue is more than difference for 10 days early. A calf 2 weeks overdue adds considerable birth weight. At 60 days bred, the calf will weigh less than an ounce. At 90 days, less than half a pound. At 120 days, it will be the size of a small cat. At 150 days, the size of a large cat. At 180 days, the size of a small dog - about 12 to 15 pounds. Then gets to birth weight (70, 80, 90, 100#) in that last 100 days. Just seems to me that birth weight is affected by environment/nutrition, growth genetics of sire and dam, and gestation length. Also leads me to believe that a CE bull due to shorter gestation does not sacrifice weaning weight like that of a CE bull due to less growth. [/QUOTE]
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