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When is a weaning weight
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<blockquote data-quote="cbcr" data-source="post: 1176810" data-attributes="member: 16303"><p>Even in a commercial operation the reason to adjust the weaning weight to 205 days is so that everything can be compared equally. The correct formula for an adjusted 205 day weaning weight is the calfs weight minus the birth weight, then divide that amount by the number of days old he is, then multiply that number by 205 and add back in the birth weight. if you don't have a birth weight then you can use either 75 or 80 lbs as the birth weight.</p><p></p><p>So if a calf is 180 days old and weighed 480 lbs. you don't have a birth weight. So use 75 lbs.</p><p></p><p>480 - 75 = 405</p><p>405 lbs. divided by 180 days = 2.25 lbs. per day</p><p>2.25 lbs. x 205 days = 461.25 lbs.</p><p>461 lbs + 75 lb. birth weight = 536 lb. adjusted weaning weight.</p><p></p><p>now if a calf is 230 days old and weighed 620 lbs.</p><p></p><p>620 - 75 = 545</p><p>545 divided by 230 = 2.37</p><p>2.37 x 205 = 485.85</p><p>486 + 75 = 561</p><p></p><p>If you want to go further, then you can also give the calf additional adjustment for the age of the dam. For example, on bull calves, if the cow was a 2 yr old add 60 lbs. to the calfs weight, if dam is a 3 yr old then add 40 lbs., a 4 yr old add 20 lbs., and for a cow between 5 and 10 years old no adjustment. Their are adjustment factors that can vary from breed to breed, but without knowing what they are, these adjustments are pretty close.</p><p></p><p>So in the above two calves, if the first calf with the adjusted 205 day weight was out of a 2 year old.</p><p>536 + 60 = 596 lbs. final adjusted 205 day weight.</p><p></p><p>if the second calf was out of a 5 year old cow, then no further adjustment. so that calfs final adjusted weaning weight would be 561 lbs.</p></blockquote><p></p>
[QUOTE="cbcr, post: 1176810, member: 16303"] Even in a commercial operation the reason to adjust the weaning weight to 205 days is so that everything can be compared equally. The correct formula for an adjusted 205 day weaning weight is the calfs weight minus the birth weight, then divide that amount by the number of days old he is, then multiply that number by 205 and add back in the birth weight. if you don't have a birth weight then you can use either 75 or 80 lbs as the birth weight. So if a calf is 180 days old and weighed 480 lbs. you don't have a birth weight. So use 75 lbs. 480 - 75 = 405 405 lbs. divided by 180 days = 2.25 lbs. per day 2.25 lbs. x 205 days = 461.25 lbs. 461 lbs + 75 lb. birth weight = 536 lb. adjusted weaning weight. now if a calf is 230 days old and weighed 620 lbs. 620 - 75 = 545 545 divided by 230 = 2.37 2.37 x 205 = 485.85 486 + 75 = 561 If you want to go further, then you can also give the calf additional adjustment for the age of the dam. For example, on bull calves, if the cow was a 2 yr old add 60 lbs. to the calfs weight, if dam is a 3 yr old then add 40 lbs., a 4 yr old add 20 lbs., and for a cow between 5 and 10 years old no adjustment. Their are adjustment factors that can vary from breed to breed, but without knowing what they are, these adjustments are pretty close. So in the above two calves, if the first calf with the adjusted 205 day weight was out of a 2 year old. 536 + 60 = 596 lbs. final adjusted 205 day weight. if the second calf was out of a 5 year old cow, then no further adjustment. so that calfs final adjusted weaning weight would be 561 lbs. [/QUOTE]
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